1988results about "Chemical analysis using titration" patented technology

The invention relates to the field of intelligent titration control, and discloses a high-precision intelligent titration control method and system.The method comprises the steps of sample information input and preprocessing planning, sample automatic preprocessing, multi-sensor system calibration and preparation, intelligent titration parameter setting and scheme optimization, and multi-sensor data real-time collection and fusion in the titration process. Titration end point prediction and judgment based on machine learning, result calculation, verification and storage, system self-cleaning, maintenance and state monitoring. Through multi-module collaborative operation and a series of intelligent technical means, the accuracy, the reliability, the automation degree and the adaptability of high-precision titration in each link are comprehensively improved, and the high requirements on the titration precision and the titration efficiency in a complex and diversified chemical analysis scene are met.

The invention belongs to the technical field of physical and chemical analysis, and particularly discloses a high-precision full-automatic titration system and method based on fusion of a spectrum sensor and a PLC, a multi-channel spectrum sensor is adopted to capture fine spectrum characteristics of solution color change in real time, and the flow rate of titration liquid is dynamically adjusted through a PLC embedded PID control algorithm, so that the titration accuracy is improved. The method realizes submilliliter-level precision control, constructs a real-time compensation mechanism in combination with temperature, humidity, pH and other environmental parameters, improves the accuracy and robustness of titration end point judgment, automatically updates an end point judgment threshold and control parameters in combination with an AI self-learning module, realizes self-adaptive adjustment and sustainable evolution of the system, and improves the accuracy and robustness of titration end point judgment. The device has the characteristics of modular structure, high detection precision, high control response and high operation stability.

The invention discloses a method for detecting the content of residual sodium in a sodium-ion battery positive electrode material, which comprises the following steps: (1) mixing the sodium-ion battery positive electrode material to be detected in a solvent, and carrying out solid-liquid separation on the obtained solution to obtain filtrate; (2) titrating the filtrate in a dynamic potential jump mode by adopting a potentiometric titrator and taking an acid solution as a titration solution, and recording the titration solution consumption corresponding to two potential jump end points when two potential jump points appear; and (3) respectively calculating the mass percentage contents of sodium carbonate omegaNa2CO3 and sodium hydroxide omegaNaOH in the filtrate according to a formula, and further calculating the mass percentage content omegaNa + of residual sodium according to the formula. According to the method, the content of all free sodium in the sodium ion positive electrode material can be accurately measured, influences of environmental factors and other impurity factors are eliminated, it is guaranteed that the consistency of detection results is good, operation is easy and rapid, and accuracy is high.

The invention relates to the field of optical nondestructive testing, and discloses a visualization method for detecting mango quality based on hyperspectrum, which comprises the following steps of: firstly, selecting mango samples, and simulating different mango ripening stages by dividing the mango samples into a plurality of groups of samples; acquiring a high-dimensional spectral image by using a hyperspectral imaging system, and measuring the hardness, the soluble solid content and the titratable acid content; correcting and extracting the high-dimensional spectral image to obtain and optimize the average reflection spectrum of the sample, and establishing a mango maturity classification model and a quality regression prediction model; performing characteristic wavelength contribution degree analysis and screening, and optimizing a quality regression prediction model by adopting a key wave band; the method is applied to each pixel point of a high-dimensional spectral image, a two-dimensional distribution diagram is generated, and mango quality visualization is achieved. The method solves the problems that in the prior art, rapid and lossless judgment of the mango ripening stage cannot be achieved, accurate prediction and visual distribution of key internal quality indexes cannot be achieved, and intelligent grading and quality control of picked fruits are not ideal.

The invention relates to a soil detection system and a detection method. Soil detection equipment comprises a sampling module, a positioning module for generating original point sampling coordinates, a sample treatment module for chemical, electrochemical and biological treatment means, a detection module, a detection database, a detection control module, a generating and sending module and a sending and receiving module. The detection method comprises the steps of sampling and processing, binding coordinates, comparing abnormal data through preliminary detection, generating a pollution map, carrying out secondary detection on abnormal data, calculating a spatial uncertainty index, dynamically generating a near-origin secondary sampling coordinate, circularly sampling and detecting until the index reaches the standard or the density upper limit, and finally generating the pollution map and a prediction model. And the detection database is updated and optimized through machine learning.

The invention relates to the technical field of titrimetric analysis automation, in particular to an intelligent titrimetric analysis system based on artificial intelligence, which comprises an error identification module, a temperature adjustment module, a viscosity compensation module, a flow adjustment module and a bubble correction module. In the invention, by independently quantifying the error and identifying the key parameter offset in real time, the data reliability in the titration process is obviously improved, the error interference is reduced, the temperature change is dynamically adjusted and coped, the reagent viscosity and flow fluctuation are adjusted in real time, and the bubble interference and density offset are identified and corrected; the accuracy and the consistency of the test in various environments are ensured, the adaptability, the stability and the repeatability of titration analysis are improved, and a high-precision and traceable experiment result is ensured.

The invention relates to an automatic monitoring technology, and provides a permanganate index detection method and an on-line monitoring method.The permanganate index detection method comprises the steps that a first reagent is prepared, and a mixed solution containing 98% of sulfuric acid, anhydrous manganese sulfate and pure water is prepared into a mixed solution containing 10-25% of sulfuric acid; the method comprises the following steps: adding a quantitative reagent I into a water sample, and heating and digesting to 90-100 DEG C; dropwise adding a potassium permanganate solution, stirring at the speed of 280-350 revolutions per minute, and then keeping at the temperature of 90-100 DEG C for 10 minutes; dropwise adding a sodium oxalate solution, and uniformly stirring; dropwise adding a potassium permanganate solution again and stirring at the same time, and judging a titration end point according to the absorbance of the solution; and calculating the permanganate index according to the drop number at the titration end point. A certain amount of anhydrous manganese sulfate reagent is added into the sulfuric acid reagent, water bath heating is not needed, and the preparation method is simpler and easier to operate than a national standard method. The real drop number of the titration end point is obtained through the equation, so that the titration drop number is more accurate and is accurate to four decimal points.

The invention provides a prospecting exploration method for ion adsorption type rare earth ore, and belongs to the technical field of geological mineral exploration, and the prospecting exploration method comprises the following steps: delineating an ore-forming mother rock area in a working area according to the existing ore points of the ion adsorption type rare earth ore in the working area and in combination with a geochemical exploration abnormal area; delineating a favorable metallogenic landform area in the working area through a GIS space analysis technology; carrying out superposition analysis on the ore-forming mother rock area and the favorable ore-forming landform area, and determining a favorable ore-forming prospective area in the working area through comparison; collecting a sample in the metallogenic distant view area, and verifying whether mineralization abnormity exists in the metallogenic distant view area or not by using a rare earth ion leaching-titration precipitation method; and in an area with mineralization abnormity in the metallogenic distant view area, exploration and evaluation are carried out by arranging Gannan drills in the metallogenic distant view area, the resource quantity of the metallogenic distant view area is calculated, and the prospecting exploration range of the ion adsorption type rare earth ore is determined. According to the method, the metallogenic prospective area can be rapidly delineated in a large range, the working range is reduced, and the efficiency of exploration work is improved.

The invention discloses a light quantum technology system for sewage treatment, relates to the technical field of sewage treatment, and is used for solving the problem that the sewage treatment efficiency of a light quantum technology is reduced due to the fact that suspended solids shield the illumination intensity and range of sewage. Calculating an ammonia nitrogen weight by using a polynomial regression algorithm, carrying out weighted calculation on the ammonia nitrogen weight and the ammonia nitrogen content in the sample to obtain an ammonia nitrogen coverage potential coefficient, and obtaining a phosphate coverage potential coefficient by using the same method. Calculating an equilibrium potential coefficient according to the ammonia nitrogen coverage potential coefficient and the phosphate coverage potential coefficient, formulating an equilibrium restriction rule to obtain a restriction difference value, randomly selecting two time points within a period of time through a recursive acquisition method to acquire mark parameter data, calculating an increase rate, and synthesizing the increase rate and the restriction difference value to obtain the content of a treated substance. Suspended matter treatment is perfected, and the sewage treatment efficiency of the light quantum technology is improved.

The utility model relates to the field of medicine detection, and discloses a medicine detection titration device which comprises a base, a fixing rod and a supporting strip, the top surface of the base is connected with the fixing rod, the outer circle wall surface of the fixing rod is provided with the supporting strip, the top surface of the supporting strip is provided with a first fixing hole, the fixing rod is sleeved with the first fixing hole, and the supporting strip is provided with a second fixing hole. Two sides of the supporting strip are connected with fixing rings, two loading strips are arranged on the top surface of the base, a plurality of accommodating grooves are formed in the top surfaces of the loading strips, the accommodating grooves correspond to the fixing rings in position, and two sliding grooves are formed in the top surface of the base. The beaker can be directly taken out from the interior of the containing groove, on the other hand, a titration reagent of the burette can react with different solutions to be detected, one burette can react with the different solutions to be detected, the beaker can be taken out more easily, and more efficiency and convenience are achieved.

The present invention provides a method for determining the residual acrylonitrile content in a polyacrylonitrile polymerization liquid, and the residual acrylonitrile content in the polyacrylonitrile polymerization liquid is determined by using a fully automatic potentiometric titrator; the method mainly comprises the steps of preparing a solution to be tested, a blank titration step, and a titration step of the solution to be tested. The present invention is used to provide a method for determining the residual acrylonitrile content in a polyacrylonitrile polymerization liquid, which can quickly and accurately determine the titration end point, thereby improving accuracy and timeliness, so as to better guide actual production. Compared with the traditional manual titration method, the present invention is simple to operate, has accurate liquid addition volume, uniform stirring speed, and sensitive endpoint mutation. The instrument can automatically titrate and stop the reaction, so that the test error is small, and the detection efficiency is greatly improved.

A quantitative analysis method for internal and external loading capacities of carbon nanotubes. The method comprises the following steps: (1) placing, in a tubular furnace, carbon nanotubes loaded with metal catalyst particles, and vacuumizing same; (2) performing annealing and capping; (3) calcining same, then placing same in a reaction kettle, adding dilute sulfuric acid, and heating same while stirring to obtain a sulfuric acid metal salt solution and capped carbon nanotubes in which metal catalyst particles are loaded; (4) measuring the loading capacity of nickel in the carbon nanotubes by means of IPC-MS technology; and (5) measuring the content of metal ions in the sulfuric acid metal salt solution by means of an EDTA coupling method. Capping the carbon nanotubes in advance before detection prevents metal nano particles loaded in the tubes from leaking, provides prerequisites for subsequent respective detection of the loading capacities in the tubes and on the outer walls, and also improves the detection precision of the internal and external loading capacities of carbon nanotubes. Moreover, the progress rate and extent of the capping reaction are regulated and controlled by adjusting the annealing temperature and rate, thereby achieving a better capping effect.

The invention discloses an instrument for detecting sulfur dioxide residue in traditional Chinese medicine, and relates to the technical field of traditional Chinese medicine detection, the instrument comprises a main machine, and also comprises a distillation flask arranged at the top of the main machine and used for containing a sample to be detected; the condensation assembly is arranged at the top of the distillation flask and comprises a condensation pipe and a sleeve, and the sleeve is fixedly arranged in the condensation pipe and divides the condensation pipe into a water passing cavity and a condensation cavity. The condensation cavity is divided into the upper condensation section and the lower condensation section through the separation part, heat can be effectively prevented from spreading to the whole condensation cavity, a certain temperature difference is kept between the upper condensation section and the lower condensation section, it is ensured that gas subjected to primary condensation can be effectively condensed on the upper condensation section, and therefore the condensation effect on distilled gas is improved; the hydrochloric acid component doped in the gas can be further reduced through twice condensation, the hydrochloric acid component is prevented from entering the absorption bottle along with nitrogen and sulfur dioxide to influence the absorption liquid, and the detection accuracy is improved.

The invention relates to the technical field of carbon sink metering and monitoring, and discloses a forest soil carbon sink metering and monitoring device which comprises a vehicle body and a mounting plate, a turntable is rotatably connected in the mounting plate, a sampling cylinder is fixedly mounted on the inner wall of the turntable, and a mounting frame is fixedly mounted at the top of the mounting plate. According to the forest soil carbon sink metering and monitoring device and method, the excavation sampling assembly is arranged, and after the excavation sampling assembly is used, under starting of a servo motor and meshing transmission of an inner gear ring and a transmission gear, a plurality of excavation shovels can rotate to the lower surface of a sampling cylinder together; according to the soil sampling device, a plurality of digging shovels are arranged in the sampling barrel, and are matched with starting of a servo motor and meshing transmission of a driving gear and an outer gear ring to rotate around the axis of the sampling barrel together, so that soil in the sampling barrel is separated from soil in a sampling area, and cylindrical sampling soil in the sampling barrel can be completely taken out under lifting of the plurality of digging shovels; and the accuracy of forest soil carbon sink metering and monitoring data is ensured.

The invention belongs to the technical field of quartz raw ore process mineralogy analysis, and particularly relates to a quartz raw ore process mineralogy analysis method which is a method for judging whether quartz raw ore can be used as high-purity quartz raw ore or not. The quartz raw ore is subjected to sample preparation, wherein a sample preparation method of a powder sample comprises the steps of crushing, wet grinding, filtering concentration and drying in sequence; carrying out chemical component analysis, phase component analysis and crystal structure analysis on the obtained powder sample; and carrying out electron probe microcell analysis, laser Raman spectrum analysis, lithofacies microscopic analysis and inclusion microscopic analysis on the obtained optical sheet. According to the quartz raw ore process mineralogy analysis method, the preparation method of the powder sample is simple, low in energy consumption and environmentally friendly, meanwhile, the obtained powder sample is slightly polluted by the outside, the obtained quartz raw ore process mineralogy analysis result can be closer to a true value, meanwhile, stable production of high-purity quartz sand can be ensured, and the production cost is reduced. And the loss of manpower, financial resources and material resources is reduced.

The invention relates to the technical field of acidic wastewater titrimetric analysis, and discloses an automatic sampling titrimetric analysis method based on a copper smelting acidic wastewater treatment link, which comprises the following steps: collecting waste acid to obtain a waste acid sample; carrying out titration treatment on the waste acid sample to obtain a waste acid sample image after the titration reaction is finished, and carrying out sediment outline extraction on the waste acid sample image to generate sediment coagulation complexity; according to the method, automatic sampling titration is combined with image analysis, precipitation coagulation complexity and arsenic specific hue separation degree are extracted, a precipitation effectiveness index and an arsenic residue risk coefficient are generated through dynamic fusion, arsenic precipitates and other precipitates in similar forms are accurately distinguished by utilizing precipitate contour features and arsenic specific hue in an HSV color space, and the arsenic content is accurately determined. The method has the advantages that spectral signal superposition interference is avoided, and the arsenic residual state can be accurately reflected, so that whether arsenic removal is qualified or not is reliably judged, the accuracy and safety of waste acid treatment are improved, and the quality of water reuse is guaranteed.

The invention discloses a comprehensive circulating water analyzer based on a titrimetric analysis method, and belongs to the technical field of power plant water treatment. The analyzer is composed of a multi-channel titration module, an intelligent temperature control reaction kettle, an optical detection array and a central processing system, and through an integrated electrode-optical composite sensing technology, a dynamic temperature compensation algorithm and a deep learning end point prediction model, the problem that in traditional circulating water detection, the multi-parameter measurement precision is low (the error gt; 2%), the anti-interference capability is poor (the turbidity is gt; the innovation points comprise (1) a three-axis linkage microtitration mechanism (the precision is 0.1 microliter) and an anti-crystallization needle head design are combined to improve the reagent feeding stability by 50%, (2) a double-layer eddy current temperature control reaction system (the temperature control precision is + / -0.1 DEG C) and eliminate the interference of temperature fluctuation on the titration reaction, and (3) a transfer learning-based end point prediction algorithm (error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t, error 1t). The device can synchronously detect eight indexes such as pH, Cl, SO, total hardness and the like, supports remote monitoring and automatic dosing of chemicals, is suitable for real-time monitoring of circulating cooling water of a power plant, the detection precision reaches + / -0.3%, and the single detection time is 1t, 2.5 minutes.

The invention discloses an ecological environment protection system for sorting management of historical remaining solid wastes, and relates to the technical field of environment protection, and the ecological environment protection system comprises a solid waste collection module, an intelligent sorting module, a treatment and disposal module, an environment monitoring module and a central control module; the solid waste collecting module is used for collecting solid waste which is left in history and comprises different types of garbage storage containers, sealing and transporting the solid waste, and transporting the collected solid waste to a sorting treatment area. According to the ecological environment protection system, a plurality of modules are integrated, an efficient and scientific historical remaining solid waste sorting management system is constructed, the system can accurately predict the waste output, the design of a waste storage container is optimized, effective collection and sealed transportation of waste are ensured, and the system is suitable for large-scale popularization and application. And the intelligent sorting module is combined with an image recognition technology and a sensor technology, so that the sorting accuracy is improved, and resource utilization of wastes is facilitated.

The invention provides a method for actively detecting the dosage of lime in lime stabilized soil for traffic infrastructure, and relates to the technical field of lime detection. The rapid detection method mainly comprises the following steps: preparing a plurality of test reagents, respectively adding a plurality of groups of lime stabilized soil containing different lime doses into an ammonium chloride solution to form a mixed solution, titrating the mixed solution by using a titrating solution, and detecting the conductivity of the solution, drawing a relation image of the solution conductivity and the dosage of the titrating solution, determining the dosage of the titrating solution when the conductivity is lowest, establishing a function relation between the lime dosage and the dosage of the titrating solution when the conductivity is lowest, repeating the steps and calculating the dosage of the lime in the to-be-detected lime stabilized soil in combination with the function relation. The invention overcomes the defects in the prior art, provides a new method for detecting the lime dosage of the lime-stabilized soil, and can quickly and accurately measure the lime dosage through the change of the conductivity in the solution and the characterization of the reaction process, thereby further improving the working efficiency.

The invention discloses a water quality total hardness and calcium and magnesium ion content detection method, which comprises: extracting a water quality sample to be detected, and injecting into a cuvette; taking a color developing reagent, injecting the color developing reagent into the cuvette, blowing, stirring and uniformly mixing to obtain a reaction solution; measuring the initial current i0 of the reaction liquid in the cuvette at the wavelength of 475nm and the initial current I0 of the reaction liquid in the cuvette at the wavelength of 640nm; then titrating, and recording a measured current value and a titration volume while titrating; according to the obtained relation curve of the current and the titration volume under the two wavelengths, obtaining the titration volume corresponding to a titration judgment end point, and substituting the titration volume into the calibration curve to obtain the concentration of total hardness or the content of calcium and magnesium ions in the water sample. The measuring method disclosed by the invention not only has extremely high accuracy and precision, but also can be applied to measurement of total hardness or calcium ions under different indicators at the same time, and the turbidity of a water sample or magnesium hydroxide precipitate generated during calcium ion measurement hardly affects a test result.

The invention discloses a method for measuring a hydrochloric acid tank solution, a neutralizing tank solution and analyzing a standard titration solution by using an automatic potentiometric titrator. The method comprises the following steps: S1, preparing a sample solution; s2, calibrating a sample solution; s3, determining a standard titration solution; selecting a sample solution meeting the requirements, wherein the sample solution is a standard titration solution; s4, titration treatment of hydrochloric acid tank liquid or neutralization tank liquid; accurately dropwise adding a calibrated standard titration solution into the hydrochloric acid tank solution or the neutralization tank solution until a titration end point is reached; and S5, measuring the concentration of the hydrochloric acid tank solution or the neutralization tank solution. The titration result of the potentiometric titration mode is not greatly different from the result of the manual titration mode, the potentiometric titration repeatability is good, the potentiometric titration reminds that the end point is advanced by artificial misjudgment by using an electric signal, and meanwhile, the program assists the calculation operation, so that the operation is simpler.

The invention discloses a method for determining the moisture testing temperature of a sodium ion battery pole piece, and belongs to the technical field of sodium ion battery testing. The method adopts a Karl-Fischer moisture meter, and comprises the following steps: when the Karl-Fischer moisture meter is in a balanced state or a stable state, setting an instrument gas source; setting the sample introduction delay time of the moisture tester, setting the heating temperature of the moisture tester according to the gradient, and waiting until the temperature rises to the set temperature and is stable; preparing a sample to be detected, weighing the sample, and inputting the weight of the sample into the moisture meter; placing the sample in a heating bin, and detecting at a gradient heating temperature; after sample moisture extraction is finished, the moisture meter displays the moisture value of the sample in real time to obtain the moisture content of the pole piece. The optimum temperature for testing the water content of the sodium-ion battery pole piece is determined by searching the inflection point temperature, and the result shows that the accuracy of the water content testing result of the sodium-ion battery pole piece is the highest at 180 DEG C.

The invention relates to the technical field of machine vision, in particular to a titration end point judgment method based on machine vision. The method comprises the following steps: acquiring a solution image set in a titration process through a high-resolution camera, and performing bilinear Laplace illumination correction to obtain an initial titration solution image set; performing data preprocessing and enhancement on the initial titration solution image set to obtain a to-be-analyzed titration solution image set; performing solution color dynamic change mode dynamic feature integration according to the to-be-analyzed titration solution image set to obtain a solution dynamic feature set; acquiring historical titration experiment data, and constructing a solution end point state prediction model based on the solution dynamic feature set and the historical titration experiment data; acquiring a real-time titration solution image set; and performing solution state prediction on the real-time titration solution image set through the solution end point state prediction model, and adjusting the titration speed until the titration solution reaches the end point state. The precision and efficiency of solution titration can be improved.

The invention discloses a constant-temperature environment titration calorimetry device and a test method. The constant-temperature environment titration calorimetry device comprises a constant-temperature temperature control system, a calorimetry system, a titration system and a controller. Wherein the titration system comprises a titration container, a liquid storage container, a third control valve and a fourth control valve, the titration container is communicated with the reaction container, the liquid storage container is communicated with the titration container, the third control valve is arranged between the titration container and the liquid storage container, the fourth control valve is arranged between the titration container and the reaction container, and the liquid storage container is used for storing a sample solution; the titration system is configured as follows: when negative pressure is formed in the titration container, the third control valve is opened, the fourth control valve is closed, and the sample solution in the liquid storage container enters the titration container; when the pressure in the titration container is increased, the third control valve is closed, the fourth control valve is opened, and the sample solution in the titration container is injected into the calorimetric container.

According to the system and the method, a titration cup is purged through a shielding gas inlet and a shielding gas outlet, a solvent is added into the titration cup, liquid in the titration cup passes through a sample introduction cavity through a sample introduction circulating pump, then is pumped back and drips into the titration cup, and the titration cup is subjected to automatic sample introduction; the method comprises the following steps of: driving a sample injection needle through a transverse guide rail to realize the circulation of a solvent in a titration cup, a sample injection cavity and a pipeline system thereof, realizing a pre-titration and drifting program, driving the sample injection needle through the transverse guide rail on the basis, cleaning the solvent, the balance solution and the sample on the sample injection needle, subsequently sucking a liquid sample with a set volume through the sample injection needle, and injecting the liquid sample into the sample injection cavity; and titrating to obtain the water content of the sample, controlling to discharge waste liquid, and starting the determination of the next sample.

The invention relates to the technical field of transformer insulating oil detection, in particular to a portable multi-parameter transformer insulating oil detection system. The detection system comprises a detection cavity used for containing to-be-detected transformer insulating oil, and a plurality of sensor acquisition modules are arranged in the detection cavity; a breathable waterproof pressure reduction device and a plurality of first ports are arranged at the top of the detection cavity, and any one of the first ports is used for adding a test reagent; a screen window type structure is arranged in the detection cavity and is used for uniformly distributing polar molecules in to-be-detected transformer insulating oil; the sampling pipeline is used for conveying to-be-detected transformer insulating oil to the detection cavity; the circulating pipeline is used for circulating the transformer insulating oil in the detection cavity; the data processing module is used for processing the data acquired by the sensor acquisition module; and the oil discharge pipeline is used for discharging the detected transformer insulating oil. According to the invention, the timeliness, convenience and comprehensiveness of transformer insulating oil detection can be improved.

The invention provides a calcium carbonate synthesis experiment device capable of controlling pH. A reaction unit is arranged in a constant temperature box; the sample reaction unit comprises a constant-temperature heating type digital display magnetic stirrer and a reaction container; the reaction container is filled with a reaction solution and a magnetic stirrer, and the reaction solution is used for simulating seawater components; the pumping unit comprises an automatic injection pump with two independent channels and is used for continuously inputting sodium carbonate and calcium chloride solutions into the reaction solution at a stable speed so as to induce precipitation of calcium carbonate; the pH titration unit comprises an automatic potentiometric titrator and is used for monitoring pH and temperature in real time, a titration solution is composed of sodium hydroxide or hydrochloric acid, sodium hydroxide or hydrochloric acid is automatically dropped into a reaction solution, and the pH of the calcium carbonate in the reaction container in the precipitation process is kept stable. According to the present invention, the pH real-time in-situ monitoring during the calcium carbonate precipitation process can be achieved, the corresponding titration program is started according to the experiment setting so as to ensure the pH stability during the calcium carbonate synthesis experiment process, and the characteristics of simple operation and process visualization are provided.

The utility model discloses an adjustable electric sand bath device which comprises a sand bath furnace, turnover mechanisms are arranged on the two sides in the sand bath furnace, a sand stacking mechanism is arranged in the middle in the sand bath furnace and comprises four lead screws, threaded blocks are arranged on the outer surfaces of the lead screws in a sleeved mode, an arc-shaped plate is arranged above the threaded blocks, and the arc-shaped plate is connected with the sand bath furnace. Arc-shaped bent plates are installed on the upper end faces of the arc-shaped plates, baffles are installed on one sides of the outer surfaces of the arc-shaped plates, heat conduction rods B are arranged on the opposite sides of the outer surfaces of the four arc-shaped plates, heat conduction rods A are arranged on the upper end faces of the heat conduction rods B, and heat conduction layers are arranged on the inner sides of the heat conduction rods A and the inner sides of the heat conduction rods B. The sand casting device has the advantages that sand casting can be carried out, so that sand is uniformly heated, samples at different liquid levels can be uniformly heated by arranging the sand stacking mechanism, and the applicability is improved.

The invention discloses an analysis device for drug detection, which comprises a base and a fixed plate arranged on the top surface of the base, a rotating plate is rotatably arranged on the surface of the fixed plate, a plurality of liquid storage cylinders are arranged in the rotating plate, and burettes are arranged on the bottom surface of the rotating plate and located at the bottom ends of the liquid storage cylinders. And an adjusting frame is fixedly arranged on the bottom surface of the fixing plate through a supporting rod. According to the analysis device for drug detection, through the arrangement of the cleaning and drying mechanism, the interior of the burette can be automatically flushed under the condition that the burette does not need to be disassembled, it is ensured that residual titration liquid and impurities are thoroughly removed, interference to next titration is avoided, and after cleaning is completed, the titration liquid can be completely separated from the burette. According to the burette drying device, residual liquid in a burette can be quickly discharged and dried in time, so that the burette is ensured to be in a dry and clean state, good conditions are created for subsequent titration analysis work, and meanwhile, the labor force is also reduced.

The invention discloses a method for measuring the concentration of sulfuric acid in electrolyte stored in a lead storage battery polar plate or partition plate, which comprises the following steps: firstly, soaking the polar plate or partition plate in pure water, and extracting residual gas in micropores in the polar plate or partition plate in a vacuumizing manner to promote H2SO4 to be fully mixed with the pure water to obtain a solution 1; and the mass of the electrolyte in the polar plate or the partition plate is obtained by calculating the difference between the mass of the polar plate or the partition plate suspended in the pure water and the mass of the bottom pure water mixed with H2SO4 by using a measuring device. And meanwhile, measuring the mass fraction theta1 of H2SO4 in the solution 1, and calculating the dilution ratio to obtain the mass percentage of H2SO4 in the polar plate or the separator. The negative pressure pumping method is used in the soaking process of the polar plate or the partition plate, multiple times of treatment on the polar plate or the partition plate are reduced, and the measurement accuracy and efficiency are improved.