89results about "Chemical analysis using precipitation" patented technology

The invention discloses a micro-scale mixing effect induced carbonate precipitation rate coefficient calculation method, which comprises the following steps: S1, carrying out a micro-scale mixing effect induced carbonate precipitation visualization experiment to obtain a carbonate precipitation image data set; s2, establishing a carbonate precipitation identification model, wherein the carbonate precipitation identification model sequentially comprises three steps of image calibration, gray scale iteration adjustment and precipitation identification; s3, establishing a carbonate precipitation rate calculation model, wherein the carbonate precipitation rate calculation model sequentially comprises three steps of pixel point statistics, precipitation amount calculation and precipitation rate calculation; and S4, establishing a carbonate precipitation rate coefficient calculation model, wherein the model comprises precipitation rate analysis and precipitation rate coefficient calculation. The calculation of the rate coefficient of the carbonate precipitation induced by the mixing effect under the microscale is realized, and support is provided for understanding the carbonate precipitation mechanism in the karst area and improving the geological storage efficiency of carbon dioxide and the efficiency of calcium carbonate precipitation induced by microorganisms.

The invention discloses a method for detecting manganese element in carbon-coated lithium iron manganese phosphate, and relates to the technical field of manganese element detection. The specific detection method is as follows: S1, ammonium ferrous sulfate calibration; S1-1, using an electric oven to dry a working reagent potassium dichromate to a constant weight, and the temperature of the electric oven is set to 120°C±2°C; S1-2, weighing 0.1000±0.0004g of the working reagent potassium dichromate in the above steps, and dissolving it in 25ml of ultrapure water; S1-3, adding 10ml of sulfur-phosphorus mixed acid solution, and adding 70ml of ultrapure water; S1-4, titrating with the prepared ammonium ferrous sulfate solution until the orange-yellow color disappears; S1-5, adding 2 drops of N-phenylated anthranilic acid indicator, and continuing to titrate until the solution changes from purple-red to bright green as the end point. The method for detecting manganese element in carbon-coated lithium manganese iron phosphate mainly avoids the influence of incomplete digestion of samples on data accuracy. The method of manual titration is used for detection, which can completely digest the lithium manganese iron phosphate, improve the detection stability, and control the extreme difference within 0.2%.

The invention relates to a sensor electrode (1) for halogen determination. Two electrode pins (2), which are connected to electrical connection components (3), project beyond an end face (40) of an electrode shaft (4). The electrical connection components (3) are arranged in the electrode shaft (4), which is produced by an injection molding process. The invention further relates to a method for producing a sensor electrode (1).

System for simulating the effect of weathering on the adsorption of heavy metals by microplastics, comprising: a) a sample preparation module configured to select, clean and divide plastic samples into weathered and unweathered categories; b) a weathering simulation module comprising an orbital shaker with a sand-water mixture and an abrasive treatment to imitate natural weathering processes; c) a heavy metal exposure module for the production and maintenance of a controlled solution containing nickel (Ni), lead (Pb), zinc (Zn), cadmium (Cd), cobalt (Co) and copper (Cu) in predefined concentrations for the purpose of exposing plastic samples over a prolonged period of time; d) a digestion and extraction module with nitric acid treatment and centrifugation for the extraction of adsorbed heavy metals from the plastics; e) an analytical evaluation module that uses atomic absorption spectroscopy (AAS) to quantify the degree of heavy metal adsorption on weathered and unweathered plastic surfaces; and f) a comparative analysis module to assess the differences in adsorption between weathered and non-weathered plastics, to determine the adsorption efficiency of different polymers and to assess the environmental impact of metal retention by microplastics.

A lab-on-chip platform is provided and includes a substrate. The substrate includes a microfluidic path. The microfluidic path has multiple inputs and an output and an analysis area downstream from a mixing area. The lab-on-chip platform further includes a cover disposed on the substrate to partially enclose the microfluidic path, a mineral layer deposited in at least the mixing area and obstructions. The mineral layer is configured to at least partially chemically react with fluid within the microfluidic path to form at least first particles and second particles, which are substantially smaller than the first particles. The obstructions are formed or disposed in the analysis area and configured to capture the first particles in the analysis area and to allow the second particles and unreacted fluid to pass out of the analysis area.

The application discloses a misaligned ten-membered cucurbituril-based assembly and application thereof in detecting and removing trinitrophenol. The assembly is assembled by using misaligned ten-membered cucurbituril and 8-hydroxyquinoline as raw materials. The misaligned ten-membered cucurbituril-based assembly is a novel supramolecular assembly, can be used for fluorescent identification of trinitrophenol in an aqueous solution, and has the characteristics of simple detection instrument, high selectivity, good sensitivity, wide detection range, fast response time, and the like. In addition, the misaligned ten-membered cucurbituril-based assembly has the characteristic of being capable of removing trinitrophenol in the aqueous solution.

The invention belongs to the technical field of battery materials, and particularly relates to a method for determining iron phosphide in a phosphate positive electrode material, the positive electrode material and application. Comprising the following steps: preparing standard solutions of a series of phosphate positive electrode materials with different iron phosphide contents; respectively collecting and purifying magnetic substances in the standard solutions, and adding a quimocilidone reagent to determine the corresponding quinoline phosphomolybdate precipitate; drawing a standard curve according to the mass of the iron phosphide and the mass of the quinoline phosphomolybdate precipitate in the standard solutions with different iron phosphide contents; preparing a to-be-detected solution, collecting and purifying magnetic substances in the to-be-detected solution, adding a quinmolybdenum citronone reagent to determine the mass of the quinoline phosphomolybdate precipitate, and calculating the content of iron phosphide in the to-be-detected phosphate positive electrode material. By means of the method, the content of trace iron phosphide in the phosphate positive electrode material can be efficiently, accurately and quantitatively analyzed, the content of iron phosphide in the phosphate positive electrode material can be quantitatively regulated and reduced, and the electrochemical performance of the phosphate positive electrode material is improved.

The utility model discloses detection equipment for aloe products, and relates to the technical field of detection equipment, the detection equipment comprises a device body, a first piston and a second bevel gear, stirring blades are movably mounted on the outer walls of the two sides of a mounting box, a mounting cover is mounted above the device body in a threaded manner, a first material pipe is mounted at the top end of the mounting cover, and a second material pipe is mounted at the bottom end of the first material pipe; a first piston is installed on the inner wall of the first material pipe, the top end of the first piston is connected with an extrusion rod, one side of the connecting pipe is connected with an alcohol tank, a second piston is installed on the inner wall of the second material pipe, and the top end of the second piston is connected with a second pneumatic telescopic rod. The double-shaft motor works to enable the second bevel gear to rotate, the second bevel gear is meshed with the first bevel gear, so that the rotating shaft drives the stirring blades to rotate at the same time, then the driving motor works to enable the worm gear to rotate, the worm gear is meshed with the worm, so that the worm drives the stirring blades to rotate, and the problem that mixing is not efficient is solved.

The invention relates to a CO2-salt water-rock multiple contact reaction simulation device and a test method thereof. The device comprises a first high-pressure reaction kettle, a high-pressure kettle with a stirrer, a second high-pressure reaction kettle, a third high-pressure reaction kettle and a fourth high-pressure reaction kettle which are connected in sequence, a thermotank and a CO2 gas cylinder; wherein the first high-pressure reaction kettle, the high-pressure kettle with the stirrer, the second high-pressure reaction kettle, the third high-pressure reaction kettle and the fourth high-pressure reaction kettle are all arranged in the constant-temperature box; the constant temperature box is used for simulating the temperature of a target reservoir; a plurality of small rock core samples and original stratum salt water are arranged in the first high-pressure reaction kettle; an automatic stirrer and a saturated CO2 solution are arranged in the autoclave with the stirrer; and the CO2 gas cylinder is used for injecting CO2 into the high-pressure kettle with the stirrer. The device can simulate that CO2 is injected into salt water to form carbonated water under high-temperature and high-pressure conditions of a stratum, and the carbonated water and stratum rocks are subjected to multiple contact reactions.

The invention provides a method and a kit for detecting the content of grease in yeast. The method for detecting the content of grease in yeast comprises the following steps: S1, preparing a sodium chloride solution with a series of concentration gradients; s2, sequentially adding bacterial liquid containing yeast to be detected into the sodium chloride solution, uniformly mixing, then carrying out centrifugal treatment, and after the centrifugal treatment, observing the initial suspended salinity, the middle suspended salinity and the complete suspended salinity of the yeast in the sodium chloride solution; s3, determining the grease content in the to-be-detected yeast according to the initial suspension salinity, the middle suspension salinity and the complete suspension salinity. According to the method for detecting the content of the grease in the yeast cells by using the saline water with different concentrations, the range of the content of the grease in the yeast cells, which can be detected, is about 10%-60%, the detection precision is about 10%, and the method has important significance on rapid detection of the content of the grease in industrial fermentation of the yeast.

The invention provides a method and device for detecting chlorine components in an oilfield chemical agent and application, and the method for detecting the chlorine components in the oilfield chemical agent comprises the following steps: pretreating a sample, and extracting the total chlorine components in the sample to obtain a to-be-detected solution containing the total chlorine components of the sample; mixing a potassium chromate aqueous solution with the to-be-detected solution; diluting the silver nitrate aqueous solution into a standard working solution with a concentration gradient; dropwise adding the standard working solution into the to-be-detected solution according to the concentration sequence from low to high until the color of the solution is just changed; and recording the consumption drop number of the standard working solution under each concentration so as to calculate the total chlorine component content. According to the method, a series of standard working solutions diluted by the silver nitrate aqueous solution with the concentration gradient are prepared, so that the measuring range is enlarged, the method is suitable for detecting the oilfield chemical agents with different chloride ion concentrations, and the chlorine content in the oilfield chemical agents can be rapidly detected.

The utility model discloses a kind of color smoke drawing agent sedimentation performance detection devices, it is related to performance detection technical field, including bottom plate, the bottom plate top end fixed mounting has placing block, the placing block top end is placed with sedimentation cylinder, four connecting pipes are fixedly connected with the sedimentation cylinder outside, the bottom plate top end is equipped with sliding slot, the sliding slot inside is slidably connected with sliding block, the sliding block top end fixed mounting has moving cylinder, four fixed blocks are fixedly installed in the moving cylinder inside, four The fixed block top end is placed with collection cylinder, four The collection cylinder inside top end is inserted with sealing plug, the utility model has beneficial effect as follows: through the setting of four collection cylinders, by inserting tube and inserting in the outside of connecting pipe, so that the liquid of different levels in sedimentation cylinder respectively flow into four collection cylinders, then can detect different levels of liquid, through the setting of this process, make operation more convenient, also reduce the amount of color smoke drawing agent used.

The utility model discloses a device for detecting the content of heavy metals in water, which comprises a bearing circular plate and a magnetic adsorption sheet, the center of the top surface of the bearing circular plate is provided with a connection sealing circular table, and the center of the connection sealing circular table is provided with the magnetic adsorption sheet; a transparent protective sleeve is installed on the upper portion of the bearing circular plate and the outer side of the connection sealing circular table in a sleeving mode, an operation shifting rod frame is installed in the transparent protective sleeve, an anti-slip strip is arranged on the outer surface of the top of the operation shifting rod frame, and a storage hole groove is formed in the center of the operation shifting rod frame. According to the device for detecting the content of the heavy metals in the water, water can be subsequently added according to assembly of a transparent protective sleeve, a bearing circular plate and a connection sealing circular table, meanwhile, a magnetic adsorption sheet is arranged in the center of the connection sealing circular table, and through magnetic adsorption of the magnetic adsorption sheet and a magnetic block, the whole operation shifting rod frame can be placed; and toppling in the storage process is avoided, and the whole carrying is facilitated.

The invention discloses a method for determining sulfate radicals in an ammonia chloride process electrolytic zinc solution, and relates to the technical field of solution ion content determination, and the method comprises the following steps: adding a precipitator into a sample solution to generate a barium sulfate precipitate; adding a magnesium source and a chelating agent, titrating by using a standard chelating agent solution under the condition that the pH value is 9-11 and the end point is indicated by an indicator, and measuring the volume V2 of the consumed chelating agent; taking the same amount of sample solution, indicating the end point by using the indicator under the same pH value, titrating by using the standard chelating agent solution, and measuring the volume V3 of the consumed chelating agent; carrying out a blank experiment, and measuring the volume V1 of the consumed chelating agent; and calculating the content of sulfate radicals in the electrolytic zinc sample solution according to V1, V2, V3, the volume V of the sample solution and the concentration of the standard chelating agent solution. According to the method, the influence of a zinc matrix, calcium and magnesium is quantitatively eliminated, so that the determination result is highly matched with the actual content, and the color change of a titration end point is sharper by adding a magnesium source.

The invention relates to the technical field of gold-tin alloy detection, in particular to a method for determining gold in gold-tin alloy, which comprises the following steps: firstly, completely dissolving the gold-tin alloy by using nitric acid and hydrochloric acid to convert gold and tin in the alloy into soluble ions so as to facilitate subsequent separation and determination; further, heating with big fire to evaporate the solution to dryness, then adding hydrogen peroxide and hydrochloric acid, volatilizing most of tin at high temperature, and removing the rest of tin by filtering to ensure the separation of tin and gold; boiling the filtrate, adding sulfurous acid, and reacting gold with sulfurous acid to generate gold precipitate, so as to realize the precipitation separation of gold; and finally, determining the content of gold in the alloy in a constant weight manner. According to the method, based on chemical property differences of different elements under different conditions, efficient and accurate determination of gold in the gold-tin alloy is achieved through the steps of dissolution, volatilization, precipitation, mass measurement and the like.

Biosynthetic melanin can capture fentanyl from aqueous environments. The captured fentanyl can be released by introducing the fentanyl-bound melanin to an acidic environment. In this way, fentanyl can capture melanin for subsequent detection / analysis, in addition to operating to remove fentanyl for decontamination.

An embodiment provides a method for measuring potassium in a sample, including: chelating an interferant, using an amount of sodium gluconate, in the sample; mitigating an ammonium interference, using an amount of alkali hydroxide, in the sample; and measuring, using a tetraphenylborate indicator, the amount of potassium in the sample by measuring a change in intensity of the absorbance of the chelated sample. Other aspects are described and claimed.

The invention belongs to the field of scale inhibitor performance evaluation, and particularly relates to a scale inhibitor dynamic evaluation method which comprises the following specific steps: firstly, taking an actual water sample or a configured water sample as an experimental water sample; putting the heating element into an experimental water sample, operating a water sample circulating system, and continuously supplementing scale anions, cations and a to-be-evaluated scale inhibitor into the system in the operation process; after the operation is finished, analyzing the scale sample to obtain the results of the scale inhibition rate, the dispersion rate of the scale inhibitor and the crystal form of the scale sample; and finally, re-preparing the scale inhibitor according to the results of the scale inhibition rate, the dispersion rate of the scale inhibitor and the crystal form of the scale sample, and repeating the steps 1-3 until the scale inhibition requirement is met. By analyzing the scale inhibition rate, the dispersion rate of the scale inhibitor and the crystal form of a scale sample, comprehensive and efficient evaluation on the performance of the scale inhibitor in the fields of pulping and papermaking is realized, the scale inhibitor is re-prepared according to an evaluation result, and the most suitable scale inhibitor is prepared for different water samples. Meanwhile, the invention further discloses the scale inhibitor prepared according to the result of the evaluation method.

An aluminum electrolytic capacitor electrolyte chloride ion detection heating device comprises a base, a heating seat and a supporting seat are arranged on the base, a heating beaker is placed on the heating seat, a mixing beaker is placed on the supporting seat, a sealing cover is arranged above the heating beaker and the mixing beaker, and the heating beaker and the mixing beaker are connected through a connecting pipe. An annular boss is arranged at the bottom of the heating base, first combustion heads are evenly distributed in the middle of the annular boss, an annular support is arranged on the side face of the heating base, second combustion heads are evenly distributed on the annular support and obliquely face the periphery of the bottom of the heating beaker, and a gas channel is machined in the heating base and communicated with the first combustion joints and the second combustion joints. A liquefied gas connector is arranged on one side of the heating base and communicated with the fuel gas channel. The beaker is heated through liquefied gas, meanwhile, the combustion heads are arranged at the bottom and on the periphery of the heating base, the combustion amount is large, and the efficiency is higher.

The present application provides a kind of experimental optimization method and experimental device of slurry carbonization flocculation, including sludge sampling and pretreatment, do early experiment to obtain sludge sample parameter;Set calcium-based reagent and CO2 gas experimental parameters and corresponding experimental parameters, construct experimental parameter combination and carry out carbonization flocculation experiment;Collect upper clear liquid and lower sediment to determine clear liquid index and sediment index, determine engineering performance and carbon sequestration capacity based on clear liquid index and sediment index;Quantitative and qualitative analysis of each type of experimental parameters and engineering performance, carbon sequestration capacity correlation is determined by using Pearson method, based on response surface method and qualitative analysis method, the change rule of engineering performance and carbon sequestration capacity under experimental parameter coupling is determined, to obtain the optimal experimental parameter combination.The present application can obtain the correlation rule of key parameters such as reagent content, CO2 aeration timing and aeration pressure and slurry treatment effect, provide basis and reference for construction, improve the practicability of carbonization flocculation treatment method.

The invention discloses a method for determining silicon dioxide in photovoltaic fluorine-containing high-phosphorus waste residue, which comprises the following steps: pretreating an original sample of the photovoltaic fluorine-containing high-phosphorus waste residue to obtain a sample to be treated; carrying out alkaline melting and dissolving treatment on the to-be-treated sample to obtain a to-be-detected mother solution; carrying out selective precipitation dephosphorization treatment on the mother liquor to be detected by adopting a precipitator to obtain a dephosphorization stock solution; carrying out masking interference treatment on the dephosphorization stock solution by adopting a tartaric acid solution to obtain a pretreatment test solution; carrying out a silicon molybdenum blue color development reaction on the pretreatment test solution to obtain a silicon molybdenum blue color development solution; and carrying out spectrophotometric determination and content calculation on the silicon molybdenum blue developing solution to obtain the mass fraction of silicon dioxide. The interference of high-concentration phosphorus elements in a sample matrix is effectively eliminated by treating a sample, and the content of silicon dioxide in the photovoltaic fluorine-containing high-phosphorus waste residues is rapidly and accurately measured.

The invention relates to the technical field of crude oil production, and discloses a method for in-situ determination of the size of asphaltene precipitates formed by CO2 driving. The method adopts in-situ determination of the size of asphaltene precipitates formed by CO2 driving for determination. The method can adjust the operating conditions such as pressure, temperature, crude oil type, CO2 purity, etc. according to actual conditions, simulate the in-situ generation of asphaltene precipitate particles under the dynamic driving conditions of CO2, accurately and reliably determine the size of asphaltene precipitates, and the determination result can be used to evaluate whether the cause of reservoir blockage is surface deposition, entrainment or pore throat blockage, and take targeted measures, which has practical application value.

To provide a method for evaluating the DAR of an ADC product that provides advantages over known methods.SOLUTION: Specifically, the method of the present disclosure can be used for a high-throughput application and / or can be used without requiring dilution of an ADC sample when the evaluation is being made.SELECTED DRAWING: None

A method for quantifying the magnesium ion amount in a soil sample, the method including: extracting calcium ions from a soil sample to produce a soil sample substantially free of calcium: mixing the substantially free calcium soil sample with ethylene glycol-bis(β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid tetrasodium salt (EGTA) to produce a first sample; mixing the first sample with an indicator reagent to produce a second sample; and determining the magnesium ion amount of the second sample; wherein the indicator reagent comprises o-cresolphthalein complexone (OCPC) and tetrabutyl ammonium hydroxide (TBAH). Also, a system and a kit using the method.

The present invention relates to the technical field of water treatment agents, and specifically to a device for testing the flocculation performance of water treatment agents, which includes a graduated cylinder, a feeding mechanism, and a feeding unit. In the present invention, the feeding unit transports three equal amounts of agents to different heights in the water sample through the first cylinder, the second cylinder, and the third cylinder, and controls the three feeding points to be equidistantly arranged in the water sample to ensure that the agents are evenly put into the water sample. Secondly, the rotation of the discharging member assists in the mixing of the agent and the water sample. Through the diversion groove, the agent is gradually mixed with the water sample during the circumferential rotation of the discharging member, and gradually drives the water sample in the graduated cylinder to be dynamically mixed with the agent. In summary, the mixing effect between the agent and the water sample is improved, the accuracy of the detection result is ensured, and the slow downward diffusion of some agents caused by the top-down feeding of the agent is avoided.

The device for automatic determination of anion and / or cation levels in urine, which comprises: a) at least one sampling unit, b) at least one turbidity measuring unit, c) at least one reagent solution storage unit, said reagent solution is suitable for detecting anions and / or cations by selective precipitation reaction, d) at least a pump for delivering a reagent solution corresponding to the precipitation reaction with the specific ion, e) at least one unit for collecting and transmitting data, and f) at least one control unit, g) a housing for mounting it to a vertical supporting structure, enclosing the units and designed for urine collection, characterized in that - further comprising a human machine interface, i.e. HMI, and - the sampling unit contains at least one electromechanical unit enabling the horizontal and vertical movements of the sample vessels, and where the anion and / or cation detected in the urine is selected from Na+, K+, Ca+, Mg2+, I-, Se2-, Li+, P043- ions, and where the automatic detection is not based on enzymatic reactions, but is a urine analysis method based on precipitation.

The present invention discloses a reactor for the production of aluminum silicate, which relates to the technical field of aluminum silicate production; it includes a reaction installation member, on which a stability detection member is installed, and the stability detection member is used to detect the stability of the solution; a grading control member is installed on the stability detection member; the grading control member is used to control the precipitation of the stable solution; a clear liquid discharge member is installed on the reaction installation member; the clear liquid discharge member is used to discharge the clear liquid after precipitation; the use of the clear liquid discharge member facilitates real-time testing of the fullness of the reaction, without relying on manual use of test strips for testing, which is time-consuming and laborious, and can detect in real time whether the discharged clear liquid can continue to undergo a precipitation reaction; to solve the problems that the current reactor for the production of aluminum silicate is not convenient for real-time testing of the adequacy of the reaction, relying on manual use of test strips for testing is time-consuming and laborious, and it is not convenient to automatically control the suspension during the discharge of the precipitate.

The invention discloses a rapid detection method for carbon tetrachloride in a water-based paraffin remover and inhibitor, the rapid detection method is suitable for rapid detection of the carbon tetrachloride in the paraffin remover and inhibitor, the rapid detection steps comprise sample preparation, reagent preparation, detection stage and result determination, and the method has the advantages of rapidness and high efficiency, and can be used for rapid screening of the carbon tetrachloride in the paraffin remover and inhibitor. The method comprises the following steps: adding a fresh aluminum bromide ethanol solution into a to-be-detected water-based paraffin remover and inhibitor, keeping a water bath at 100 DEG C, and continuously stirring; if white precipitates or flocculent insoluble substances appear in the sample to be detected, it is judged that the sample to be detected contains carbon tetrachloride, and if white precipitates or flocculent insoluble substances do not appear in the sample to be detected, it is judged that the sample to be detected does not contain carbon tetrachloride. According to the method, large instruments and equipment are not needed, and rapid detection of carbon tetrachloride in the water-based paraffin remover and inhibitor can be achieved in a simple and efficient mode.

The application relates to a nuclear power plant accident solution analysis method, device, equipment and storage medium, comprising the following steps: determining the total reaction surface area of silver particles in a solution in a current period based on a first parameter of the silver particles, a second parameter of silver iodide and a solution volume in the current period; determining the generation amount of silver iodide in the solution in the current period according to the total reaction surface area of the silver particles in the solution, inherent properties, a first chemical reaction rate constant of the solution and the solution volume; determining the decomposition amount of the silver iodide in the solution in the current period according to the dose rate of a pool in a containment and a second chemical reaction rate constant of the solution; and determining the residual amount of the silver iodide based on the generation amount and the decomposition amount of the silver iodide in the solution in the current period. Compared with the result obtained by manual estimation, the application is more efficient and more accurate.