31results about "Chemical analysis using precipitation" patented technology

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 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 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 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.

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

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.

The invention belongs to the technical field of ammonium phosphate product detection, and particularly relates to equipment and a method for detecting available phosphorus and water-soluble phosphorus in an ammonium phosphate product. A first feeding trolley, a second feeding trolley and a third feeding trolley are sequentially arranged on the operation table in a matched mode. A first volumetric flask is hinged to the bottom side of the first feeding trolley; a dumping assembly is arranged on the bottom side of the second feeding trolley and comprises a beaker, a box cover matched with the drying box is arranged on the bottom side of the third feeding trolley, and a crucible type filter is arranged on the bottom side of the box cover; when the third feeding trolley transports the crucible type filter to the outer side of the drying box and the third feeding trolley and the second feeding trolley are in butt joint, the beaker and the crucible type filter are close to each other, and the dumping assembly dumps the mixture in the beaker into the crucible type filter. By efficiently connecting equipment in each determination process, the whole determination process is simpler and more convenient, and the qualified rate and the detection efficiency of ammonium phosphate analysis and detection can be greatly improved.

The invention relates to the technical field of semiconductor materials, in particular to a heavily-doped silicon single crystal oxygen precipitation detection method which comprises the following steps: S1, pickling a complete silicon wafer; s2, spraying the atomized transition metal salt solution on the surface of the silicon wafer; s3, placing the silicon wafer in a nitrogen atmosphere of 750-900 DEG C, and keeping the temperature constant for 30-60 minutes; s4, cooling the silicon wafer to room temperature at a cooling rate of 10-20 DEG C / s; s5, removing an interference layer on the surface of the silicon wafer; s6, observing the metal decoration pattern on the surface of the silicon wafer to judge the oxygen precipitation concentration; thus, through cooperative control of the temperature and the cooling rate, the metal ions are selectively deposited only at the oxygen precipitation and the induced defects of the oxygen precipitation, so that the concentration of the oxygen precipitation is accurately and reliably revealed; meanwhile, the oxygen precipitation concentration is measured by performing metal decoration on the surface of the complete silicon wafer, so that the influence of artificial damage caused by cutting the sample on the detection result can be avoided, and the accuracy of the oxygen precipitation concentration detection result is remarkably improved.

The present invention relates to determining phase information of a fluid sample. At least one image of the fluid sample including the phase information of the fluid sample is provided. Additionally, a data driven model which comprises at least one output channel for the phase information is provided. The at least one output channel includes at least one output channel for classifying a boundary between two phases of the fluid sample, such that the phase information includes information about a property of the boundary between the two phases, such as a height, a volume, a type, or a strength of the boundary. The phase information of the fluid sample is derived based on the data driven model and the at least one image of the fluid sample including the phase information of the fluid sample.

The invention relates to the field of analytical chemistry, in particular to a method for measuring the content of phosphorus in electrolyte. The method for measuring the phosphorus content in the electrolyte comprises the following steps: pretreating an electrolyte sample to obtain a sample to be measured; adjusting the pH value of the to-be-detected sample, adding a first precipitant, and carrying out precipitation reaction and aging to obtain an intermediate product; separating the intermediate product to obtain a precipitate; the precipitate is washed with alkali, dried and weighed, and the content of phosphorus in the electrolyte is calculated according to the mass of the dried precipitate; the first precipitant comprises a magnesium ammonium mixed precipitant. According to the method, through specific sample pretreatment, precipitation condition optimization and washing steps, interference of common coexisting substances in the electrolyte is effectively eliminated, it is ensured that phosphorus is quantitatively separated out in the form of specific precipitate magnesium ammonium phosphate, and finally the phosphorus content is calculated by weighing the weight of the precipitate. The method has the advantages of high accuracy, good precision, strong anti-interference performance, low cost and easiness in popularization.

The application provides a method for testing the concentration of impurity elements in vanadium electrolyte for a vanadium redox flow battery, comprising a reduction method and an oxidation method. The method can be used to determine all metal elements of main groups and side groups contained in the vanadium electrolyte, which can be detected by an inductively coupled plasma mass spectrometer, and one or more than two of Be, Si, B, P, S, As, Se, Br, Te and I elements. The test method of the application can greatly reduce the total salt concentration of the vanadium electrolyte, which is lower than 0.2%wt, meet the sample injection requirements of the inductively coupled plasma mass spectrometer, reduce the dilution multiple of the sample injection solution, and improve the detection accuracy of the impurity elements.

The utility model provides a cerebrospinal fluid protein qualitative experiment detection test tube and a reagent kit, the cerebrospinal fluid protein qualitative experiment detection test tube comprises a test tube body, the tube wall of the test tube body comprises more than one black tube wall and more than one transparent tube wall, and the black tube walls and the transparent tube walls are alternately distributed. According to the cerebrospinal fluid protein qualitative experiment detection test tube provided by the embodiment of the invention, the black tube wall can provide a black background for observing a sample, so that the sample is more obvious, the detection precision is improved, other black backgrounds do not need to be found when a result is observed, the test efficiency is improved, an observer can observe through the transparent tube wall, and the detection time is shortened. And the transparent tube wall can reduce the interference on the observation result.

The invention provides separation and purification equipment and process for indigo blue preparation, and belongs to the technical field of dye preparation, and the separation and purification equipment comprises a purification barrel body which is a containing cavity for indigo blue fermentation; the stirring mechanism is used for stirring and mixing the indigo blue fermentation solution; the precipitation detection mechanism is used for detecting the precipitation state of the indigo blue fermentation solution in the purification barrel; the driving mechanism is used for providing driving power for the rotation of the stirring mechanism and the detection position of the sediment detection mechanism; the liquid discharging mechanism is arranged on one side, far away from the sediment detection mechanism, of the outer wall of the purification barrel body, and the liquid discharging mechanism is used for discharging different layered solutions by controlling opening and closing of liquid discharging through holes in the connecting position of the liquid discharging mechanism and the purification barrel body; the separation mechanism is mounted on the stirring mechanism and is used for separating the layering of the solution in the purification barrel body through the linkage control of the separation mechanism and the liquid discharging mechanism; automatic monitoring of the solution precipitation state is realized through the integrated precipitation detection mechanism, and precise separation and discharge of the layered solution are realized through linkage control of the liquid discharge mechanism and the separation mechanism.

The present invention relates to a method for detecting metallic foreign matter in an electrode active material, comprising: a first step of mixing an electrode active material with an aqueous nitric acid solution to form a metallic foreign matter extraction solution; a second step of selectively precipitating metallic foreign matter from the metallic foreign matter extraction solution to obtain a precipitate; and a third step of measuring the content of metallic foreign matter in the precipitate.

The device comprises a sample bottle, a collection assembly, a microporous filtration assembly, a carbon dioxide collection bottle, a gas-guide tube, at least one absorption tube and a vacuum pump connected to the downstream of the tail end absorption tube which are connected in sequence, and each bottle body and the pipeline form a closed gas path capable of keeping a pressure reduction state during use. In the working state of the vacuum pump, the to-be-detected carbon dioxide aerial fog cosmetic stably passes through the microporous filtering assembly through the collecting assembly under the action of negative pressure and then is efficiently collected into the carbon dioxide collecting bottle; under the action of the heating device, carbon dioxide in the liquid is released, enters the absorption pipe through the gas guide pipe and fully reacts with the absorption liquid to generate precipitates. The device is simple in structure and relatively low in cost, can realize effective solid-liquid separation of a sample and quantitative transfer of carbon dioxide under a decompression condition, reduces impurities and leakage interference, and remarkably improves the accuracy, repeatability and applicability of detection of the content of carbon dioxide in carbonic acid cosmetics.

The invention discloses a method for measuring the content of organic sulfur in sulfur-containing gas, the sulfur-containing gas contains hydrogen sulfide, the sulfur-containing gas passes through silica gel loaded with a hydrogen sulfide precipitant, the content of sulfur in carrier gas flowing through the silica gel is measured, the hydrogen sulfide precipitant can react with hydrogen sulfide flowing through the gas to generate precipitate, and the content of organic sulfur in the carrier gas is measured. The hydrogen sulfide precipitator is inorganic salt. According to the invention, inorganic salt is loaded on the silica gel as a hydrogen sulfide precipitant, when sample gas containing hydrogen sulfide and organic sulfur passes through the silica gel, because the hydrogen sulfide precipitant reacts with hydrogen sulfide to generate a precipitate which is deposited on the silica gel to be removed, the organic sulfur does not react with the precipitant and enters a total sulfur analyzer along with carrier gas, and the content of the organic sulfur is determined; therefore, interference of hydrogen sulfide is eliminated, and the anti-interference capability on high-concentration hydrogen sulfide is high.

The invention relates to a measuring device for quantitative chemical analysis that uses a conveying unit. This conveying unit is connected via a multi-way valve to a sample container, a measuring container, and at least one reagent container. A reagent is conveyed by the conveying unit from the reagent container to the measuring container, which contains a sample. A sensor that detects a transition point is attached to the measuring container. The device can additionally be connected to a waste container. A method for using this device comprises drawing up the sample, adding it to the measuring container, and measuring the transition point.

The present application relates to a kind of CO2-salt water-rock multiple contact reaction simulation device and its testing method, the device includes first high-pressure reactor, high-pressure reactor with agitator, second high-pressure reactor, third high-pressure reactor and fourth high-pressure reactor connected in sequence;And thermostat and CO2 gas cylinder;Wherein, the first high-pressure reactor, high-pressure reactor with agitator, second high-pressure reactor, third high-pressure reactor and fourth high-pressure reactor are all placed in the thermostat interior;The thermostat is used to simulate target reservoir temperature;Multiple core samples and original formation salt water are built-in the first high-pressure reactor;Automatic agitator and saturated CO2 solution are built-in the high-pressure reactor with agitator;The CO2 gas cylinder is used to inject CO2 into the high-pressure reactor with agitator.The device can simulate the high temperature and high pressure condition of formation, CO2 is injected into salt water to form carbonic acid water, and multiple contact reactions occur with formation rock.

The application relates to the field of drug detection, in particular to a method for detecting blood drug concentration of olanzapine. In the process of extracting olanzapine, the method adopts the mode of first precipitation and then extraction, which can improve the recovery degree of olanzapine in blood, and further improve the detection accuracy of olanzapine at a lower concentration.

The present disclosure provides materials and methods for assessing the presence and levels of polyanionic compounds in a sample that inhibit PCR reactions, including assays for the presence and optionally amount of polyvinyl sulfonate, as well as materials and methods for reducing or removing such compounds from buffer and protein solutions using a variety of approaches, including titration-based techniques.

The present disclosure provides methods for assessing the DAR of ADC products that offer advantages over known methods: specifically, the disclosed methods can be used in high-throughput applications and / or can be used without requiring dilution of the ADC sample during the assessment. [Selection diagram] None

Provided is an online monitoring device for sulfur trioxide in flue gas, which relates to the technical field of gas detection and comprises: a sampling gun, for collecting flue gas; an absorption device, for preventing oxidation of sulfur dioxide and absorbing sulfur trioxide in the flue gas; a mixing box for mixing the absorption liquid and a precipitating agent to obtain a mixed solution; an atomizer for atomizing the mixed solution; an evaporation chamber connected to the atomizer, for drying the mixed solution droplets to form a dry particle airflow; a light scattering measurement chamber connected to the evaporation chamber, for light scattering measurement of the dry particle airflow to obtain a mass concentration of particles; and a control device for determining the concentration of sulfur trioxide in the flue gas according to the mass concentration of particles. The present application converts the gaseous sulfur trioxide into solid, measures the concentration of sulfur trioxide using a light scattering method, and has the advantages of high accuracy, good repeatability, fast measurement speed and online monitoring. It solves the current problem that sulfur trioxide monitoring can only be achieved by offline monitoring method.

A measuring device for quantitative chemical analysis uses a conveying unit connected to a sample container, a measuring container, and at least one reagent container via a multiple valve. A reagent is conveyed by the conveying unit from the reagent container into the measuring container, which contains a sample. A sensor that detects a transition point is attached to the measuring container. The device can also be connected to a waste container. One method of using this device involves drawing the sample, adding it to the measuring container, and measuring the transition point.

The utility model discloses a chromium-containing sewage treatment device for a hospital test room, and particularly relates to the technical field of chromium-containing sewage treatment, which comprises an adjusting tank, an equipment room is arranged on one side of the adjusting tank, a reaction tank is arranged on the other side of the adjusting tank, and a coagulative precipitation tank is arranged on one side of the reaction tank. A PAC adding device, a PAM adding device, an automatic acid adding device, an automatic alkali adding device and a ferrous sulfate adding device are respectively arranged in the equipment room, and a pH display, an ORP display, an electromagnetic air pump and a PLC control system are also arranged in the equipment room. According to the utility model, a plurality of treatment units such as an adjusting unit, a reaction unit and a coagulating sedimentation unit are integrated, and the PLC control system is combined to realize accurate automatic control, so that chromium pollutants in sewage are effectively removed, the effluent quality is ensured to reach the standard, and meanwhile, the treatment efficiency and the stability are improved.

An method for detecting a target substance includes providing a sample including the target substance and an active species, converting the active species into a deactivated species, adding a reactive agent into the sample to form a solid species including the target substance, separating the solid species from the deactivated species by solid-liquid separation, and determining a concentration of the target substance in the sample by measuring a concentration of the target substance in the solid species.

A process for quantifying the amount of unbound metal and bound metal in solution is provided. A process for quantifying the amount of bound metal amino acid chelate and free ligand in a solid (e.g., dry mixture such as an animal feed) is also provided.

The application discloses a kind of ash analysis methods containing high carbonate coal, belong to coal detection technical field, it includes the following steps: 1) sample acidolysis;2) gas multistage purification;3) carbon dioxide absorption and determination;4) calculation and correction.The analysis method of the application, by setting H2S, excluding HCl, multistage targeted purification unit of depth drying in turn, effectively eliminates the influence of interfering gas on carbon dioxide determination, improves the accuracy of determination result;And using low-toxic, renewable or easy to handle active iron oxide, molecular sieve and other materials, substantially reduce the operation health risk, environmental pollutant emission and hazardous waste disposal cost;And the purification material used is mostly renewable and reusable, reduces the reagent consumption cost of single determination;While using carbon dioxide absorption core-classical barium hydroxide solution method, and quantitative by gravimetric method, principle is clear, result is accurate and reliable, easy to connect with standard ash determination process.