731results about "Chemical analysis using titration" patented technology

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 discloses a method for determining the content of hydrogen ions in a chloroplatinic acid solution, and belongs to the technical field of analytical testing. In order to solve the problems that the chloroplatinic acid solution is yellow after being diluted and the manual titration end point is difficult to judge, a potentiometric titration method is adopted, and the end point is determined by measuring electrode potential mutation without depending on indicator color change. The method comprises the steps of test condition preparation, burette calibration, standard solution preparation and calibration, sample treatment and titration, result calculation and the like, a full-automatic potentiometric titrator is selected, the titration volume is controlled within the range of 10-15 mL, and a sodium hydroxide standard solution is used for sample titration after calibration. The relative standard deviation of the determination result is less than 0.5%, the adding standard recovery rate is between 96.3% and 103.1%, and the method has the characteristics of high analysis speed, high accuracy and good stability, is suitable for accurate detection of hydrogen ions in chloroplatinic acid production and quality inspection, and effectively solves the defects of the traditional method.

The invention relates to the technical field of agricultural cultivation, in particular to a farmland soil ecological structure restoration and soil fertility improvement cultivation method which comprises the steps that 1, the soil state is evaluated; 2, tillage depth is determined; step 3, adding organic materials; 4, tillage operation is carried out, a tillage machine is used for carrying out soil tillage, the tillage depth is the tillage depth determined in the step 2, and the tillage operation adopts a layered tillage mode including shallow tillage and deep tillage; step 5, inoculating a microbial agent, namely inoculating the soil microbial agent based on the soil microbial diversity and the soil enzyme activity in the step 1 after the cultivation operation; 6, covering and maintaining are conducted, after cultivation and inoculation, soil covering and maintaining are conducted, and using of covering materials and precise water and fertilizer management are included. Accurate soil evaluation and personalized tillage depth determination enable soil remediation to be more targeted and effective; organic materials and microorganisms are reasonably matched and used, so that the soil fertility and the biological activity are improved.

The invention discloses a ground monitoring method for water and soil loss and carbon loss of a road slope, and belongs to the field of ecological monitoring. The method comprises the following steps: setting an engineering disturbance area and a natural contrast area according to regional water and soil loss, vegetation coverage and altitude gradient, and arranging an erosion pile sample plot to form a contrast observation network; removing impurities on the surface layer of the sample plot, collecting a soil sample, obtaining volume-weight data, and recording environmental parameters such as geographic position, altitude and gradient; the method comprises the following steps: pretreating a soil sample, measuring organic carbon content and volume weight, and obtaining carbon components and physical parameters; the exposed height of the erosion pile is measured regularly, erosion / accumulation modulus is calculated, and a space-time database is established in combination with weather, disturbance events and the like; and based on the erosion / accumulation data and the physical and chemical parameters, constructing a model to quantify carbon loss and carbon sequestration caused by water and soil loss. According to the method, through contrast point distribution, high-frequency observation and multi-parameter analysis, whole-process dynamic monitoring of complex terrain carbon migration is achieved, and the method is suitable for accurate evaluation of water and soil loss induced carbon loss in the field of ecological monitoring.

The invention relates to the technical field of novel material chemical analysis, and discloses a triphenyl phosphate purity standard substance valuing method, which comprises the following steps: filtering, drying, dissolving and sterilizing a triphenyl phosphate sample; a triphenyl phosphate sample is comprehensively analyzed from different angles by comprehensively applying a GC-MS (Gas Chromatography-Mass Spectrometry) technology, an NMR (Nuclear Magnetic Resonance) technology, an infrared spectroscopy, a gas chromatography-flame ionization detector method, a Karl Fischer method and an inductively coupled plasma mass spectrometry, and finally, the purity value of the triphenyl phosphate purity standard substance is calculated by a mass balance method. The method provides a scientific and accurate technical means for quality control and standard formulation of the triphenyl phosphate product, has important practical application value for related industries in the fields of chemical engineering and material science, and is beneficial for improving the product quality and promoting industrial upgrading.

The invention discloses a sulfur-containing magnetite beneficiation method which specifically comprises the following steps: S1, raw material preparation: crushing sulfur-containing magnetite to obtain small-particle sulfur-containing magnetite; s2, physicochemical property determination: detecting the particle size of the small-particle sulfur-containing magnetite, the content of magnetite in the small-particle sulfur-containing magnetite and the content of sulfur minerals in the small-particle sulfur-containing magnetite; s3, magnetic separation: according to the physicochemical properties of the small-particle sulfur-containing magnetite detected in the step S2, automatically controlling the magnetic field intensity of a magnetic separation process through a controller, and carrying out magnetic separation to obtain magnetite and sulfur-containing ore; the magnetic field intensity of the magnetic separation process is dynamically adjusted according to the iron ore particle size of the sulfur-containing magnetite, the magnetite content in the sulfur-containing magnetite and the sulfur mineral content, the trends of iron minerals and sulfur minerals are accurately controlled, optimal adjustment of the element trends is achieved, and the recovery rate of iron and sulfur is increased.

The invention is suitable for the application field of electrolyte acidity determination, and provides a method for determining the acidity of an all-vanadium electrolyte based on a complexing mass difference method, and the method comprises the following steps: taking the all-vanadium electrolyte, and diluting the all-vanadium electrolyte into a pretreated all-vanadium electrolyte with the concentration of 0.05-0.1 mol / L; adding 1.5-2mL of a complexing masking reagent with the molar concentration of 1.5-2mol / L, weighing, and recording as M1; stirring and titrating, weighing and recording as M2; a quantitative determination method of mass difference is used for calculation, and the formula is {(M2-M1)-0.05} / A * C. In conclusion, a mass difference quantitative determination method is adopted, the vanadium complexing masking reagent is added, the adding amount and the pH value of the vanadium complexing masking reagent are controlled, a stable complex is formed through the complexing masking reagent, vanadium ions and impurity ions, the oxidation-reduction reaction and the precipitation reaction of the complex and sodium hydroxide are inhibited, and the accuracy of the acidity value of the all-vanadium electrolyte is improved.

The invention relates to the technical field of functional group analysis, and discloses an adsorption material surface functional group analysis method and system based on a Gaussian function model.According to the method, proton binding isotherm data of an adsorption material under different pH conditions are obtained through an incremental titration method, and the proton binding isotherm data are input into a Gaussian function model; the method comprises the following steps: carrying out characterization analysis on different types of functional groups, fitting experimental data by using a nonlinear least square method to obtain optimized parameters, verifying the accuracy of the optimized parameters by using a preparatory test means, analyzing the proportions of various functional groups in the adsorption material based on the verified optimized parameters, and generating a surface functional group distribution map. According to the method, distribution of different functional groups is accurately analyzed through the Gaussian function model, the defect that quantitative analysis of a traditional method is not accurate is overcome, high accuracy of a result is ensured, detailed data support is provided for design and optimization of an adsorption material, and the problem that in the prior art, when multiple functional groups coexist, the detection effect is not accurate is solved.

The invention relates to the technical field of environmental analytical chemistry, and discloses a thymol phenolphthalein-TBPE double indicator-based cyanide titration detection method and system, and the method comprises the following steps: adjusting a water sample to be detected to an alkaline pH interval to construct a detection matrix; the method comprises the following steps: introducing a double-indicator system composed of thymol phenolphthalein and tetrabromo phenolphthalein ethyl ester according to a specific ratio into a detection matrix, and constructing a spectrum background for masking yellow interference of sulfide by utilizing the blue color development characteristic of thymol phenolphthalein; dropwise adding a silver nitrate standard solution into the mixed system to execute a complex reaction; according to the method, a spectrum background shielding field is constructed, chromaticity response of a system in a specific wave band is monitored in real time, and when a chromaticity mutation signal from green to bluish violet is captured, a titration end point is judged, and the cyanide concentration is calculated. High-precision anti-interference detection on cyanide in a complex high-turbidity matrix is realized, and the sensitivity and accuracy of end point recognition are improved.

The invention provides a fruit and vegetable quality analysis method and system based on near infrared spectrum detection, and relates to the technical field of food detection.The fruit and vegetable quality analysis method comprises the steps that near infrared spectrum data of all surface areas of a fruit and vegetable sample are collected, statistical characteristics such as interval mean values, standard deviations and extreme values are extracted through preprocessing and spectrum level fusion, spectral feature vectors are constructed, and the near infrared spectrum data of all the surface areas of the fruit and vegetable sample are analyzed; calculating a comprehensive quality score by using a Gaussian membership function, performing clustering based on a K-value clustering method and setting constraint conditions, dynamically adjusting an initial clustering center, forming a first clustering set, then constructing a neural network model, optimizing model parameters by using a mean square error loss function, and obtaining the comprehensive quality score; and comparing the distance with the center of each clustering subset to accurately determine the quality category of the fruits and vegetables. According to the invention, through collection of the near infrared spectrum data of the fruits and vegetables and construction of the neural network quality prediction model, accurate prediction and automatic classification of the quality of the fruits and vegetables are realized.

The invention relates to the field of chemical analysis automation equipment, and discloses an automatic potentiometric titration method which comprises the following steps: before a titration task is started, executing adaptive cleaning and collecting residual spectrum fingerprints of a system; calibrating a titration prediction model in real time by using the fingerprint; performing predictive titration to obtain complete titration data; after the titration is finished, carrying out multi-dimensional analysis on the whole process data, and quantitatively evaluating the pollution risk and the data quality; and finally, dynamically adjusting the cleaning strategy of the next task according to the evaluation result, and adaptively updating the prediction model according to the prediction deviation of the titration. By establishing a closed-loop intelligent working process of cleaning, diagnosis, feedback and learning, the state of the system can be sensed in real time, a cleaning strategy and a prediction model can be dynamically adjusted, the cleaning effect is ensured, self-optimization of the titration process is also realized, the long-term analysis accuracy and the intelligent level of the automatic titration system are improved, and the working efficiency is improved. And the dependence on manual intervention and troubleshooting is reduced.

The invention discloses a novel squid quality degree grading judgment method based on physical and chemical indexes of freshness, which comprises the following steps: selecting different squids as samples, respectively carrying out volatile basic nitrogen content detection and total texture analysis on the squids, measuring the freshness and the physical and chemical indexes of the squids, carrying out Pearson correlation on the two, and determining the quality degree of the squids. Through principal component analysis and combination of TVB-N content on a freshness limit value of an animal aquatic product, texture physicochemical indexes having the greatest influence on squid quality grading are found. According to the method, the quality of the squids can be quickly judged by performing texture analysis on the squids, combining with the limit value of the content of volatile basic nitrogen in animal aquatic products in national standard and measuring the elasticity index of the sample, so that quick quality grading judgment can be performed on the squids on the basis, and scientific guidance is provided for further quick quality identification of marine foods.

This disclosure provides an experimental apparatus for measuring the migration law of chloride ions in concrete under tensile load. The apparatus includes a base plate, with fixed supports on both the left and right sides of the top of the base plate. Between the two fixed supports are N transparent boxes and N+1 tensioning components. Each transparent box contains a prism-shaped concrete specimen of appropriate size. A resistance strain gauge is mounted on the top of the prism-shaped concrete specimen, and the specimen is communicatively connected to a strain gauge measuring instrument via the strain gauge. A hydraulic hollow jack is located on the left side of the top of the base plate, to the left of the fixed support on the same side. A pressure sensor is connected to the left end of the hydraulic hollow jack, and the pressure sensor is communicatively connected to a load display. A hydraulic loading pump is also connected to the hydraulic hollow jack. A spring baffle is located on the right side of the top of the base plate, to the right of the fixed support on the same side. A return spring is located between the spring baffle and the fixed support on the same side.

The invention relates to the technical field of decarburization solvent evaluation. The invention relates to a decarburization solvent evaluation method, which comprises: (1) carrying out an absorption reaction on a decarburization solvent and a CO2-containing gas mixture to obtain a decarburization solvent rich solution, collecting the decarburization solvent rich solution when the reaction time is t, measuring the load of CO2 in the decarburization solvent rich solution, recording the load as L, and stopping the reaction when the decarburization solvent absorbs CO2 to achieve a saturation state; (2) carrying out regeneration reaction on the rich solution of the decarburization solvent in the step (1), collecting the regenerated decarburization solvent, measuring the load of residual CO2 in the regenerated decarburization solvent, and recording the load as Lr; and (3) calculating the regeneration degree R of the decarburization solvent, and evaluating the decarburization solvent according to the load L of CO2 in the rich solution of the decarburization solvent and the regeneration degree R. According to the evaluation method of the decarburization solvent, the two indexes of CO2 load and regeneration degree of the decarburization solvent are integrated, the advantages and disadvantages of the decarburization solvent can be visually reflected, and the evaluation result is more comprehensive and reasonable.

The utility model relates to the technical field of water-based acrylic resin detection, and discloses an automatic titration detection device for water-based acrylic resin, which comprises a detection base, a detection platform is mounted on the detection base, a titration bottle for mixing liquid is arranged on the detection platform, a burette is arranged on one side of the titration bottle, and the burette is connected with the detection platform. A plurality of clamp assemblies for fixing burettes are arranged on the detection platform; by arranging the shaking assembly and the driving assembly, after a titrant and a solution to be detected are put into a titration bottle, the titration bottle is put on the shaking assembly, and the shaking assembly can be rotated by starting the driving assembly, so that the fixed titration bottle also rotates, and two liquids in the titration bottle are shaken and mixed through rotation; by means of the arrangement, titration detection of the water-based acrylic resin can be completed, manual shaking mixing of detection personnel can be avoided, and damage caused by long-time wrist shaking is avoided.

The embodiment of the invention discloses a method and related equipment for synchronously analyzing a thermodynamic phase and a dynamic phase in an electrode phase change process, a constant-current intermittent titration sequence is utilized, the dynamic phase and the thermodynamic phase of a to-be-detected electrode can be induced, synchronous acquisition is carried out at a specific moment in combination with in-situ X-ray diffraction, and the analysis result is accurate. Therefore, the kinetic phase and the thermodynamic phase of the to-be-tested electrode are distinguished, captured and defined by experimental means. Specifically, structure information collected in a constant-current pulse stage in a constant-current intermittent titration sequence corresponds to a kinetic phase and reflects transient and unbalanced structures in a phase change process; structural information collected after the open-circuit voltage relaxation stage meets a threshold condition corresponds to a thermodynamic phase and represents a stable structure tending to be balanced under the current composition; therefore, the dynamic phase and the thermodynamic phase of the electrode to be detected can be clearly analyzed. The method is widely applied to the technical field of material characterization.

To provide a detection method and detection device for COD analysis titration end point, and a COD automatic analyzer that automatically detect a titration end point that is defined in "oxygen consumption by potassium permanganate at 100°C (CODMn)" in JIS K 0102 17.SOLUTION: A detection method for COD analysis titration end point according to the present invention is a method for detecting a titration end point that is defined in "oxygen consumption by potassium permanganate at 100°C (CODMn)" in JIS K 0102 17, and includes: irradiating an Erlenmeyer flask 115 containing a solution 141 with light with a wavelength of 535-545 nm; receiving light transmitting through the solution 141 and the Erlenmeyer flask 115; and detecting the titration end point from the amount of change in the quantity of received light with a wavelength of 535-545 nm.SELECTED DRAWING: Figure 1

The invention discloses a method for rapidly determining the hydrolysis degree of an acrylamide polymer, which comprises the following steps: preparing a polymer solution from a to-be-determined polymer, dropwise adding acid into the polymer solution, and determining the hydrolysis degree of the acrylamide polymer according to an ionization constant expression and the pH change of the polymer solution after dropwise adding the acid under the condition that the ionization constant of the polymer tends to be stable. The amount of sodium carboxylate groups in the polymer solution is determined, the ratio of the sodium carboxylate groups to the total number of polymer chain links is calculated according to the amount of the sodium carboxylate groups, and the hydrolysis degree of the to-be-measured polymer is obtained; the problems that a specific pH value is approximately used as a judgment basis for reaching a titration end point in an existing hydrolysis degree detection method, but the actual situation is that the pH values are different when polymers with different hydrolysis degrees reach the titration end point, so that measurement errors are caused are effectively solved.

The application belongs to the technical field of analysis and detection, and discloses a method for continuously detecting pH value, sulfuric acid content and zinc ion content of electroplating liquid or conductive roller cleaning liquid. The method comprises the following steps: 1) selecting the "pH" block in "pH / mV" on the potential titrator, setting the instrument parameters, inserting the electrode into the to-be-detected liquid, and reading the pH value displayed by the potential titrator; 2) selecting the "mV" block in "pH / mV" on the potential titrator, selecting the dynamic pH titration mode, setting the instrument parameters, diluting the to-be-detected liquid after the pH value is detected, inserting the electrode into the diluted to-be-detected liquid, and adopting the sodium hydroxide standard solution titration, and ending the titration after two equivalent points appear; and 3) calculating the pH value, sulfuric acid content and zinc ion content of the to-be-detected liquid through a formula. The application can realize the continuous detection of the three indexes by adopting one instrument and one standard titration solution, is simple, fast and high in accuracy, and can effectively reduce the influence of chemical reagents on the health of workers.

The invention relates to the technical field of zinc hydrometallurgy, and discloses an analysis method for measuring high cobalt content by an EDTA complexing back titration method, which is based on the following steps: oxidizing Co < 2 + > into Co < 3 + > by using potassium nitrite in an acetic acid medium to form cobalt potassium nitrite precipitate so as to realize separation of cobalt and interfering ions, dissolving the precipitate, complexing with excessive EDTA, and performing back titration by using a zinc standard solution. Xylenol orange is used as an indicator, and determination is completed at room temperature in a hexamethylenetetramine buffer system with the pH value being approximately equal to 5.8. Coexisting ion interference is effectively eliminated through tartaric acid, sodium fluoride, thiourea and other masking agents, the method has the advantages of being easy and convenient to operate, sensitive in end point, high in accuracy and low in cost, and the requirement for conventional analysis of high-cobalt materials can be met.

A method and system for identifying a high-impact polystyrene (HIPS) recycled material are disclosed herein. The method includes: acquiring a HIPS sample (S101); performing sample analysis on the HIPS sample to obtain analysis result data, where the analysis result data include first analysis data representing contents of blending components, second analysis data representing a degradation degree, and third analysis data representing a low-molecular-weight compound, and the sample analysis includes acceleration factor test analysis (S102); comparing the analysis result data with feature data in a HIPS database to determine feature data corresponding to each type of the analysis result data, where the HIPS database is pre-established on the basis of HIPS plastics from various sources (S103); and identifying the HIPS sample according to feature data corresponding to the analysis result data and by a multivariate decision tree algorithm, to determine a recycled material status and a source of the HIPS sample (S104). Rapid and accurate identification of HIPS recycled materials with different content proportions and recycled material sources can be realized.

The present application belongs to the technical field of saturated water detection, and relates to a coal-based hydrocarbon fuel oil saturated water content measurement correction method and device, the measurement correction method comprising: 1) determining the water activity of each temperature node corresponding saturated fuel oil sample at normal temperature; and detecting the water content corresponding to each temperature node saturated fuel oil sample by using Karl Fisher Coulomb method; 2) correcting the saturation degree calculation formula of the saturated fuel oil sample by using the measurement results of step 1), and determining the correction coefficients A, B and C values; 3) cooling the saturated fuel oil sample, real-time monitoring the temperature and the corresponding water activity in the cooling process, and substituting into the corrected formula, and calculating the saturated water content in the saturated fuel oil at low temperature. The coal-based hydrocarbon fuel oil saturated water content measurement correction method provided by the present application corrects the saturation degree calculation formula, thereby improving the measurement accuracy of trace saturated water at low temperature.

The utility model particularly relates to a high-efficiency steam quality detection device which comprises a dryness and superheat degree detection device assembly, an air-cooled condensing device assembly and a non-condensable gas detection device assembly, the dryness and superheat degree detection device assembly comprises a steam guide four-way pipeline, a first pressure transmitter, a drain valve, a measurement four-way pipeline, a second pressure transmitter and a temperature sensor, and the air cooling condensation device assembly comprises an efficient condenser and an efficient cooling fan. The non-condensable gas detection device assembly comprises an air burette, a first electromagnetic valve, a first pressure differential sensor, a second pressure differential sensor, a condensate water burette and a second electromagnetic valve. The steam quality detection device has the advantages of high precision, high efficiency, high automation degree, capability of completely meeting the requirements of EN285 regulations on steam quality detection and the like.

The utility model provides a double-station single-point constant volume device, belongs to the technical field of sample detection, and solves the problem that the existing manual titration method and volumetric method both have certain defects. The device comprises a bottom plate, an automatic shooting constant volume module is arranged on the bottom plate, the automatic shooting constant volume module comprises at least two constant volume tubes which are vertically arranged, indicating scales are arranged on the side walls of the constant volume tubes, the number of the constant volume tubes is at least two, the constant volume tubes are arranged in parallel, and a constant volume camera with a lens right facing the lower portions of the constant volume tubes is arranged on the bottom plate on one side of the constant volume tubes; and an automatic liquid adding module capable of dropwise adding a solution into the constant volume tube is also arranged on the bottom plate. The double-station single-point volume fixing device can simulate a manual titration method, automatic line marking and volume fixing are carried out, repeatability and volume fixing accuracy are met, and meanwhile potential health hazards caused by manual titration are avoided.

The application provides an automatic titration analysis method for measuring the aluminum content in high aluminum alloy, which adopts direct reaction of fluoride with a test solution to realize one-step direct titration, and determines the aluminum content in the range of 2.00% to 100.00%, and comprises the following steps: sample decomposition; precipitation of interfering ions; calibration of sodium fluoride standard solution; calibration of automatic potentiometric titrator; and measurement of the sample to be tested. The application solves the problems of sample pretreatment and how to avoid the influence of interfering ions on the determination of aluminum content. The titration operation, reading and calculation are automatically completed by the instrument, effectively reducing human errors, and the application has the advantages of simple operation, accurate and rapid results, wide application range and the like.

The invention discloses a soil organic carbon mineralization rate determination method, and relates to the technical field of soil carbon circulation and greenhouse gas monitoring. The method comprises the following steps: carrying out hydrochloric acid back titration on an absorption liquid by adopting an automatic potentiometric titration method, converting to obtain the mass of a carbon element contained in carbon dioxide, calculating the mineralization rate by combining the dry soil weight and the culture interval, and finally subtracting an inactivation control value to obtain the organic carbon mineralization rate driven by pure microorganisms. A thin-wall stainless steel undisturbed soil drill matched with the inner diameter of a culture bottle is used for collecting soil columns in a layered manner, PVC liner tube sealing and constant-temperature transportation are matched, and a cold chamber for simulating the in-situ temperature is combined, so that the in-situ structure and the microbial habitat of the loose high-water-content peat soil are reserved to the maximum extent, and damage of traditional pretreatment to soil pores and microbial communities is avoided.

The invention discloses a method for simultaneously measuring total acid and protein solubility of fermented soybean meal. The method comprises the following steps: S1, measuring the initial pH of a 0.2% potassium hydroxide solution; s2, weighing two fermented soybean meal samples with the same mass, respectively putting the two fermented soybean meal samples into a beaker A and a beaker B, and adding an equivalent 0.2% potassium hydroxide solution; substances in the beaker A are stirred and centrifuged, and supernate is taken to obtain to-be-detected liquid A; s3, adding a potassium hydroxide standard titration solution into the to-be-detected solution A for titration, observing the pH change of the to-be-detected solution A at any time by using an acidimeter, recording the volume of the consumed potassium hydroxide standard titration solution when the titration end point is reached, and meanwhile, performing a blank test; s4, adding a potassium hydroxide standard titration solution into the beaker B, stirring, centrifuging, taking supernate, digesting, and measuring crude protein contents W1 and W2; and S5, calculating a result. According to the method for simultaneously determining the total acid and the protein solubility of the fermented soybean meal, the accuracy of detecting the protein solubility of the fermented soybean meal is improved.

The invention belongs to the field of chemical reagent moisture detection, and particularly relates to a coulometry Karl Fischer reagent for aldehyde ketone moisture detection and a preparation method of the coulometry Karl Fischer reagent. The coulometry Karl Fischer reagent for aldehyde ketone moisture detection is prepared from the following components in parts by weight: 1 to 15 percent of imidazole, 1 to 15 percent of 2-methylimidazole, 25 to 70 percent of ethylene glycol monomethyl ether, 5 to 30 percent of trichloromethane, 2 to 30 percent of trifluoroethanol, 2 to 10 percent of sulfur dioxide, 1 to 10 percent of methyl iodide, 0.1 to 5 percent of tetrabutylammonium iodide and 0.1 to 5 percent of iodine. The method does not contain hydroxyl compounds, effectively inhibits the generation of side reactions in detection, ensures the detection accuracy, and improves the product stability and effectively shortens the instrument equilibrium time by adding iodomethane and tetrabutylammonium iodide.

The invention discloses an electric stirring ash dosage detection device, and relates to the technical field of ash dosage detection, the electric stirring ash dosage detection device comprises a moving base of a U-shaped structure, one side, far away from an opening, of the moving base is fixedly provided with an armrest frame, a lifting frame consistent with the opening of the moving base is arranged above the moving base, and one side of the moving base is fixedly provided with a linear driving mechanism; a stirring frame is arranged in the lifting frame, a stirring motor is fixedly arranged on the stirring frame, the two ends of the stirring frame are rotationally connected to the lifting frame through cantilevers, and a stirring rod is connected to the output end of the stirring motor; a connecting seat is arranged on one side of the stirring frame, and a sealing cover matched with a cylinder opening of the sample cylinder is rotationally connected to the connecting seat; a turnover mechanism is arranged between the movable base and the stirring frame, a sampling pipe is arranged on the connecting seat, and the sampling pipe is connected with a titration device for detecting the ash dosage. The device is convenient to operate, the stirring quality can be improved, the labor intensity is relieved, the body health of workers is guaranteed, and meanwhile the accuracy of detection data can be improved.