46 results about "Potentiometric titration" patented technology

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

The invention discloses a method for determining the 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 belongs to the technical field of carbon capture, and particularly relates to a method and a device for measuring the concentration of amine in a carbon capture absorbent. The determination method comprises the following steps: (1) calibrating the consistency of a reference amine solution and a pH meter; (2) judging a potentiometric titration end point; and (3) determining the amine concentration of the carbon capture absorbent. The detection method is simple and feasible, the determination device is simple in structure and convenient to operate, and the concentration of the amine in the online running carbon capture absorbent can be monitored, so that the effective running of the carbon capture device is ensured, and the problem that determination cannot be performed due to the fact that a sample is dark in color and cannot be distinguished at a titration end point in a color indicator method is solved.

The utility model relates to the technical field of potentiometric titration instruments, in particular to a potentiometric titration instrument with a burette monitoring device, which comprises a titration instrument body, a titration table is arranged at the upper end of one side of the titration instrument body, a placement groove is arranged in the middle of the right side of the titration table, and a clamping mechanism is arranged between the placement groove and the titration table; the sleeve is movably mounted in the middle of the left side of the titration table. During use, as the two sides of the first rack are meshed with the driving gear and the driven gear respectively, the driven gear is driven to rotate and controls the second rack on the other side to move in the opposite direction, the push rod is pushed through the connecting pieces on the two sides, and the push rod controls the first clamping plate to tighten the spiral spring; after being compressed, the spiral spring drives the second clamping plate to adaptively clamp the titration container, so that the titration container can be quickly clamped, and after an experiment is completed, the sleeve is reversed to reset the spiral spring, so that the second clamping plate can be loosened, and the operation is convenient during use.

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 an analysis method for determining the content of water-soluble chlorine in basic cupric carbonate. Compared with the prior art, the method has the advantages that by optimizing sample treatment and determination conditions, the determination accuracy and precision are remarkably improved, and meanwhile, the analysis time is shortened. Specifically, a set of sample pretreatment process is customized according to different contents of water-soluble chlorine in a sample, and rapid and accurate chlorine content determination is realized through an improved potentiometric titration technology. According to the method, the detection efficiency is improved, and the reliability of the result is ensured by reducing personal errors. In addition, the analysis speed of the method is 1.5 times higher than that of a traditional method, the accuracy is improved by 30%, and the precision error range is reduced to 5%.

The invention discloses a method for determining the content of sulfate radicals in a water sample. According to the method, a calcium ion selective electrode is selected as an indicator electrode through a full-automatic potentiometric titration method, the amount of EDTA consumed by Ca < 2 + > and Mg < 2 + > in a to-be-detected water sample and the amount of EDTA consumed by Ba < 2 + > in a blank solution are respectively measured by using an EDTA standard solution, and then the previously titrated blank solution containing Ba < 2 + > which is excessive relative to the content of SO4 < 2-> in the to-be-detected water sample is added into the to-be-detected water sample; and measuring the content of excessive Ba < 2 + > by using an EDTA standard solution, and calculating to obtain the content of SO4 < 2-> in the water sample to be measured. The method is suitable for measuring the content of sulfate radicals in a water sample with high content of calcium, magnesium ions and sulfate radicals, and has the advantages of simple detection method, low cost and high practical value.

The invention relates to a device and a method for determining the purity of high-purity ammonium chloride by a weighing potentiometric titration method, and belongs to the field of chemical standard substance purity constant value testing. The device comprises a sample introduction system, a reaction system and a detection system, a sample introduction pipe and a sample discharge pipe in the sample introduction system are respectively introduced into a weighing bottle and a reaction tank, and a flow type intelligent metering pump assembly can accurately control the sample introduction pipe to convey liquid at high speed, medium speed and low speed or stop conveying liquid; the reaction system comprises a reaction tank and a stirring device, the reaction tank contains a tested solution, and the stirring device can be an electromagnetic stirrer or a magnetic rotor; and the detection system comprises an electrode and an automatic titrator. The device is used for titrating the purity of ammonium chloride and evaluating the uncertainty of the purity value of ammonium chloride. The device is convenient to operate, easy to control and high in automation degree, the precision meets the national standard requirement, and the method can be used for purity titration experiments of high-purity substances.

The invention relates to the technical field of air detection, and particularly discloses a method for measuring formaldehyde content in indoor air, which is used for measuring indoor formaldehyde gas by potentiometric titration and comprises the following steps: firstly, preparing a K2Cr2O7 standard solution, a Fe < 2 + > standard solution and a formaldehyde standard solution; secondly, taking a K2Cr2O7 standard solution as an absorption liquid of formaldehyde gas, adding sulfuric acid and distilled water, heating in a water bath, transferring into a gas sampler, and sampling air to obtain a sample collection liquid; and placing the sample collection solution in a water bath kettle, continuously heating, titrating the excess K2Cr2O7 and formaldehyde blank sample by using an automatic potentiometric titrator by using a Fe < 2 + > standard solution as a titrating solution, and calculating the content of formaldehyde in the air. The method disclosed by the invention is simple to operate and accurate in determination, the reaction speed can be increased, the reaction degree can be improved, the lowest detection limit can reach 0.006 mg / m < 3 >, and the method can be used for determining the indoor formaldehyde content. The problems that in the prior art, operation is tedious, the duration time is long, and the detection limit is too high are solved.

The present invention provides a method for detecting the acid value in a low concentration in a photovoltaic adhesive film. The method includes the following steps: preparation of a sample to be tested; testing stage: first, the content and types of volatile acids of the sample to be tested are detected by headspace gas chromatography-mass spectrometry (HS-GC-MS), then the sample after headspace treatment is recovered and placed in a solvent, and swelling extraction is carried out by water bath ultrasonic treatment to obtain an extraction solution. After titration testing with an automatic potentiometric titrator in combination with an indicator, the acid value C is obtained; analysis of the test results. For the first time, it is proposed to combine headspace gas chromatography-mass spectrometry (HS-GC-MS) with full-automatic potentiometric titration to detect the acid value in the adhesive film. The combination of back titration and indicator method is used to improve the accuracy of detection, and for the first time, it is innovatively proposed to simulate the aging environment in a headspace vial to more accurately and comprehensively detect the acid value of the photovoltaic adhesive film.

The invention belongs to the field of metal ion concentration detection, and particularly relates to a method for detecting the concentration of vanadium ions in a vanadium battery negative electrode electrolyte through two-step potentiometric titration. Aiming at the problems of inaccurate measurement result, large error and complicated operation of the existing vanadium battery negative electrode electrolyte, the vanadium ion concentration in the vanadium battery negative electrode electrolyte is detected by adopting two steps of potentiometric titration, the first titer is that the negative electrode electrolyte is added into a mixed acid solution containing excessive pentavalent vanadium and sulfur and phosphorus in an open system, and the second titer is equal to the first titer; 2-valent and 3-valent vanadium ions in the solution are all oxidized into 4-valent vanadium ions by pentavalent vanadium ions, meanwhile, part of pentavalent vanadium ions are reduced into 4-valent vanadium ions, and then potassium permanganate is used for titration of the concentration of the 4-valent vanadium ions in the solution so as to solve the problem of exposure oxidation of the 2-valent vanadium ions; in the second step of titration, potassium permanganate is directly used for titration of vanadium ion concentration in the negative electrode electrolyte. Results prove that the method is small in detection result deviation, high in precision and accuracy, portable in carried instrument and suitable for real-time monitoring of the energy storage power station.

The application discloses a kind of residual alkali detection methods in sodium ion layered oxide positive material, comprising the following steps: step 1, dispersing agent is added to sodium ion layered oxide positive material, stirring, extraction, suction filtration, and filtrate is collected;The dispersing agent is combined by polar organic reagent and water;Step 2, the pH value of filtrate is measured using potentiometric titration method, and the residual alkali in sodium ion layered oxide positive material is calculated.The application has the following beneficial effects: by adding an appropriate amount of polar organic reagent on the basis of using water as dispersant, the generation of NaOH in the material during testing and its influence on testing are inhibited, the testing interference caused by excessive organic solvent is avoided, the stability of the material during potentiometric titration is improved, and the sodium carbonate content detection result is more accurate and stable.

The invention relates to the technical field of solution concentration analysis, in particular to a method for measuring the concentration of each component of a hydrofluoric acid and fluosilicic acid binary system, which comprises the following steps: step 1, weighing a certain amount of mixed acid solution, dispersing in a solvent, taking alkali liquor as a titrant, and measuring the concentration of each component of the hydrofluoric acid and fluosilicic acid binary system; the volume # imgabs0 # of alkali liquor consumed accumulatively at a first jump point of the mixed acid solution and the volume # imgabs1 # of alkali liquor consumed accumulatively at a second jump point of the mixed acid solution are measured through potentiometric titration, and the first jump point corresponds to a neutralization reaction of # imgabs3 # in # imgabs2 #; the second jump point corresponds to a neutralization reaction of # imgabs 5 # in # imgabs 4 #; 2, according to the mass of the weighed mixed acid, the mass fraction of the # imgabs8 # and the mass fraction of the # imgabs9 #, the mass fraction of the # imgabs8 # and the mass fraction of the # imgabs9 # are calculated;

The invention discloses an automatic potentiometric titration detection method for analyzing the content of sodium carbonate in alkali powder. The reaction principle in the process of detecting the content of sodium carbonate in the alkali powder is an acid-base neutralization reaction, the pH value in the reaction cup can change along with the continuous reaction process, the corresponding pH value is identified through the potential change of the electrode on the automatic potentiometric titrator to indicate the titration end point, and the content of sodium carbonate in the alkali powder is detected and analyzed. According to the detection result, the poor accuracy of the manual titration detection result is eliminated, the operation is simple, the reagent consumption is low, the detection efficiency is high, and the detection analysis of the effective calcium oxide content in the lime can be accurately and quickly realized.

The invention discloses a system and a measuring method for measuring the content of hydrogen sulfide in a sample by taking a lead nitrate standard solution as a titrant after the hydrogen sulfide in crude oil and liquid sulfur is purged and absorbed and using an automatic potentiometric titration method to calculate the content of the hydrogen sulfide in the sample. The invention provides a gas purging and absorbing system for measuring the content of hydrogen sulfide. The gas purging and absorbing system comprises a gas source, a gas drying device, a gas generating device, a gas washing device and a gas absorbing device which are connected in sequence, a flow meter and a control valve are arranged on a connecting pipeline of the gas source and the gas drying device; a stirring device is arranged in the gas generating device, and a temperature-controllable heating and heat-preserving device is arranged outside the gas generating device. The method is small in interference degree, high in automation degree, capable of greatly improving precision and accuracy, simple, convenient and rapid.

The invention discloses a method for measuring the content of cyanide in sodium nitroprusside by potentiometric titration, which comprises the following steps: taking a cyanide ion selective electrode as an indicator electrode, adding disodium ethylene diamine tetraacetate into a solution to be measured, and measuring the content of cyanide in sodium nitroprusside under an alkaline condition. The method is easy to operate, high in safety, high in sensitivity, good in precision and high in accuracy, and the content of cyanide in sodium nitroprusside and related preparations of sodium nitroprusside can be rapidly and accurately measured.

The invention relates to a potentiometric titration method for measuring the concentration of divalent silver ions, which comprises the following steps: installing an electrode in a container, and adding sample liquid into the container to submerge the electrode; a burette is installed above the container, a titrating solution is put into the burette, and the titrating solution is cerous nitrate; dropwise adding the titration solution into the sample liquid for multiple times, determining the titration amount of each dropwise adding and the electrode potential in the corresponding titration process, waiting for a first preset time after each titration, then reading the electrode potential, waiting for a second preset time after reading the electrode potential, and then carrying out next titration; based on the titer and the electrode potential of each time, the change rate of the electrode potential along with the titer is obtained; positioning a critical point of the electrode potential based on the change rate, and determining a target titer when the electrode potential reaches the critical point; and determining the concentration of the divalent silver ions based on the target titer. The technical effects that the detection result is more accurate, the automation degree is improved, and the risk of the reagent is reduced are achieved.

The invention belongs to the technical field of electrolytic potentiometric titration, and particularly relates to a method for judging an end point of a Coulomb-method Karz moisture meter. The method comprises the following steps: acquiring electrolytic potential dynamic data of an electrolytic system of an electrolytic tank in an electrolytic process; constructing an electrolysis potential prediction model of the electrolysis system of the electrolytic tank according to the electrolysis potential dynamic data; according to the electrolysis potential dynamic data and the electrolysis potential prediction model, constructing an optimization function for stopping electrolysis of the electrolysis system of the electrolytic tank; the electrolysis potential at the current moment is collected; according to the electrolysis potential at the current moment, an end point judgment control scheme of the electrolysis system of the electrolytic tank is generated through an optimization function, and the termination electrolysis potential of the electrolysis system of the electrolytic tank is calculated; and controlling the electrolysis system of the electrolytic tank through the termination electrolysis potential. According to the invention, the titration delay is shortened, and the measurement accuracy is improved, so that a more accurate measurement result is obtained.

The invention relates to the technical field of sodium aluminate solution analysis, and provides a sodium aluminate solution on-line analysis system and method.The sodium aluminate solution on-line analysis system comprises an on-line sampling module used for automatically collecting a sodium aluminate solution sample from a production pipeline and conducting pretreatment on the sodium aluminate solution sample, and filtering suspended particles and conducting automatic dilution according to the concentration range; the multi-channel analysis module integrates a near infrared spectrum analysis unit, a potentiometric titration analysis unit and a conductivity / TOC sensor unit and is used for synchronously detecting the contents of aluminum oxide, total alkali, caustic alkali and carbon alkali in the sodium aluminate solution; and the intelligent control module is based on a PLC (Programmable Logic Controller) or an industrial computer and is used for controlling an analysis process and optimizing detection parameters. Through synchronous operation of the multi-channel module, the traditional manual detection period of 2-6 hours is greatly shortened to 20-40 minutes, and the real-time performance is improved by matching with the full-process automatic design of automatic sampling, filtering and diluting; meanwhile, due to cooperative application of technologies such as near infrared spectrum and potentiometric titration, the detection precision reaches + / -0.5%.

The invention discloses a potentiometric titration detection method for a silver element in an antibacterial medical titanium-based silver alloy, which comprises the following steps: dissolving a titanium-based silver alloy sample by hydrofluoric acid and nitric acid, adding hydrochloric acid to convert silver ions into silver chloride precipitates, adding a saturated boric acid solution to complex fluorine ions in the solution, and carrying out tilting filtration on supernatant by using medium-speed filter paper to obtain the silver element in the antibacterial medical titanium-based silver alloy. After washing for multiple times, filtering and collecting precipitates, dissolving the precipitates by dropwise adding ammonia water for multiple times, titrating with a potassium iodide standard titration solution by taking a silver-potassium iodide silver electrode as an indicator electrode and a saturated calomel electrode as a reference electrode in an ammoniacal medium, and indicating an end point by adopting a potentiometric method. According to the method, the to-be-detected element silver is separated by adopting a dissolution-precipitation-separation method, the saturated boric acid is added to avoid corrosion of fluorine ions in the solution to glassware and electrodes, and the method is reliable, high in precision and accuracy and suitable for accurate detection of the silver element in the common antibacterial medical titanium-based silver alloy in the field of biological medicine.

The invention relates to a positive electrode material and a battery. The positive electrode material is a lithium nickel cobalt oxide composite oxide. The positive electrode material comprises a base material and a coating layer on at least part of the surface of the base material; performing an acid-base potentiometric titration test on the positive electrode material by using a potentiometric titrator and hydrochloric acid with a concentration of 0.02 mol / L to obtain a curve graph of a relationship between a differential value dpH / dV and a consumption volume VmL of hydrochloric acid, the dpH / dV being a differential value obtained by differentiating the consumption volume VmL of hydrochloric acid by using a pH value; in a relation curve graph of the differential value dpH / dV and the consumption volume VmL of the hydrochloric acid, the positive electrode material has a first characteristic peak when the consumption volume of the hydrochloric acid is V1mL, the positive electrode material has a last characteristic peak when the consumption volume of the hydrochloric acid is V2mL, and V1 and V2 meet the relation: 0.6 < V2-V1 < 2.7. According to the positive electrode material, gas production and impedance of the positive electrode material can be reduced, and meanwhile, the structural orderliness and structural stability of the positive electrode material are improved, so that the safety performance, the capacity and the cycle performance of the positive electrode material can be improved.

According to the boron trifluoride gas content on-line detection system device for boron isotope separation and the on-line detection method, boron trifluoride gas in the process is absorbed and converted into boric acid on line, and then the content of the boric acid is detected on line by utilizing a potentiometric titration method; the total amount of the gas after boron trifluoride exchange rectification in the process is obtained through conversion; compared with the prior art, the on-line detection system device and the on-line detection method have the advantages that leakage of toxic gas can be effectively avoided, environmental water is prevented from entering a reaction system due to sampling, adverse effects of temperature and pressure fluctuation on product quality can be reduced, and the device is prevented from being eroded by a byproduct hydrogen fluoride.

The invention relates to the technical field of energy storage and flow batteries, in particular to an electrolyte chromium dichloride concentration testing system and method and application. The system comprises an inert atmosphere device and a testing device, and the testing device is arranged in the inert atmosphere device; a potential monitor and a titration sub-device are arranged in the testing device. According to the method, the ferric chloride solution with a certain concentration is used as the oxidizing agent, the oxidation-reduction potentiometric titration test is carried out in the inert gas atmosphere, the oxidizing agent is not prone to deterioration, economical and easy to obtain and does not react with any other substances / ions except Cr < 2 + > in the electrolyte, the test accuracy is guaranteed, and the test time is shortened. The method for judging the reaction endpoint by potential mutation avoids the interference of ion color judgment, so that the accurate concentration of Cr < 2 + > in the electrolyte of the iron-chromium flow battery can be quickly obtained.

The invention relates to the technical field of potentiometric titration, in particular to a multi-station automatic potentiometric titration analysis system, which is used for solving the problem of poor glass beaker positioning effect in the prior art. The system comprises a positioning mechanism, a clamping mechanism and a position correcting mechanism, the clamping mechanism comprises a first clamping plate and a second clamping plate which symmetrically slide on the upper portion of a mounting base, and the first clamping plate and the second clamping plate get close to each other to push a positioning rod to synchronously get close to a glass beaker; the rotating shaft is provided with first teeth in vertical one-to-one correspondence with the positioning rods, a rectangular rod is slidably connected into the mounting seat, the rectangular rod is provided with second teeth, the rotating shaft has a first state and a second state, when the rotating shaft is in the first state, the second teeth can be meshed with the first teeth, and when the rotating shaft is in the second state, the second teeth can be meshed with the second teeth. The second teeth are not engaged with the first teeth; the system can stably clamp the glass beaker.

This invention belongs to the field of detection technology, specifically disclosing a method and system for detecting chloride ions in high-concentration samples used in the salt-making industry. The detection method includes the following steps: (1) cyclically taking samples from the process pipeline to ensure real-time sample availability; (2) diluting the sample to ensure that the concentration of the sample falls within the optimal detection range; (3) inputting the diluted sample into the titration system, performing titration using potentiometric titration, outputting the first derivative DE / DV in real time, and using a nonlinear normalization function to normalize the original DE / DV sequence to obtain S. norm Value, according to S norm Adjust the speed of the titration pump, S norm The point corresponding to the maximum value is the titration endpoint. The titration volume V2 of the silver nitrate standard solution at this point is recorded, and the chloride ion concentration in the pipeline sample is calculated. This invention stably maps the wide-range fluctuating DE / DV signal to a fixed interval, solving the core problem of inaccurate endpoint determination and ensuring the accuracy and reliability of the detection results.

The utility model belongs to the technical field of waste acid treatment, and particularly relates to a waste acid concentration detection device which comprises an electromagnetic stirrer, a base and an automatic potentiometric titrator are respectively arranged on the side edge of the electromagnetic stirrer, a stirring cup is arranged on the electromagnetic stirrer, and a connecting port and a wire are arranged on the automatic potentiometric titrator. A reference electrode and an indicator electrode are arranged on the wire, a first supporting rod and a second supporting rod are arranged on the base, a fixing sleeve and a connecting plate are arranged on the first supporting rod, a connecting rod is arranged on the fixing sleeve, a bearing ring is arranged on the connecting rod, a bearing rod is arranged on the connecting plate, a limiting ring and a supporting ring are arranged on the bearing rod, and the limiting ring and the supporting ring are arranged on the supporting rod. A dropper is arranged in the supporting ring, and an electromagnetic valve is arranged on the dropper. According to the utility model, a manual titration method is replaced by a potentiometric titration method, a titration end point can be automatically found out in a titration process by using the automatic potentiometric titrator, and finally, the dropping amount of a medicament is controlled through the electromagnetic valve, so that errors caused by manual operation are avoided.

The invention relates to the technical field of solution concentration analysis, in particular to a method for measuring the concentration of each component in hydrofluoric acid, ammonium fluoride and acetic acid mixed acid liquor, which comprises the following steps: step 1, weighing a certain amount of mixed acid liquor, dispersing the mixed acid liquor in a solvent, and taking alkali liquor as a titrant, determining the volume # imgabs0 # of alkali liquor accumulated and consumed by a first jump point and the volume # imgabs1 # of alkali liquor accumulated and consumed by a second jump point of the mixed acid solution through potentiometric titration; step 2, weighing a certain amount of the mixed acid solution, dispersing the mixed acid solution in a solvent, and titrating the solution to be neutral through a potentiometric titration method by taking alkali liquor as a titrant; then, a fluorine ion electrode is adopted, # imgabs2 # is used as a titrant for continuous titration, and the consumption of # imgabs3 # is the consumption of # imgabs4 #; 3, according to the mass of the weighed mixed acid and the concentration of the # imgabs 5 #, the concentration of the # imgabs 6 #, the concentration of the # imgabs 7 # and the concentration of the titrant, the mass fraction of the # imgabs 8 #, the mass fraction of the # imgabs 9 # and the mass fraction of the # imgabs 10 # are calculated. The method can accurately measure the content of each component in an unconventional mixed acid liquid system of hydrofluoric acid, ammonium fluoride and acetic acid.

The utility model discloses automatic potentiometric titration detection equipment for marinated products, and relates to the field of titration detection.The automatic potentiometric titration detection equipment comprises a main machine, an operation face is installed on the main machine, a burette fixing base is installed on the main machine, a lower stirrer is installed on the main machine, and an electrode telescopic support is arranged on one side of the lower stirrer; a fine adjustment mechanism is arranged on the electrode telescopic support, and a rapid fixing mechanism is arranged between the electrode telescopic support and the main machine. The electrode telescopic support is used for driving the electrode to enter a solution to be measured, then the fine adjustment mechanism is used for fine adjustment to the accurate height, titration is started, and the reading of the solution measured by the electrode is read in time on the operation surface in the titration process. Therefore, the possibility that a worker needs to repeatedly adjust the electrode telescopic support to reach a proper height, and time and labor are wasted can be reduced, and meanwhile, the height of the electrode in a solution to be detected is more accurate.

This invention provides an automated potentiometric titration method for determining the platinum content in platinum jewelry, belonging to the field of precious metal analysis and detection technology. The method mainly includes: dissolving the platinum jewelry sample in aqua regia and using a separating reagent to precipitate and separate interfering precious metals such as palladium, gold, and silver. Subsequently, the sample is passed through a strongly basic anion exchange resin column, where platinum is selectively adsorbed as chloroplatinate complex anions to obtain a purified platinum solution. The platinum content is calculated using a back titration method. This method integrates interfering element separation, ion exchange purification, back titration, and automated potentiometric detection technologies, and optimizes the electrode system. This method has the advantages of high accuracy, good precision, strong anti-interference ability, and relatively simple and reliable operation, and is suitable for the accurate determination of platinum content in platinum jewelry and platinum alloys of various purities such as Pt900, Pt950, and Pt990.

The invention relates to the technical field of potentiometric titration electrode supports, and discloses a potentiometric titration electrode support and a storage box, the potentiometric titration electrode support comprises a storage box main body, the upper surface of the storage box main body is provided with a sealing cover, and the storage box main body is internally provided with an electrode support main body; a lifting mechanism for conveniently controlling the electrode support main body to ascend and descend is arranged in the storage box main body, a temperature control mechanism for conveniently controlling the temperature and humidity in the storage box main body is arranged at the bottom of the storage box main body, the side cavities are formed in the two sides of the interior of the storage box main body, and the lower fixing plates are fixedly connected to the inner walls of the side cavities. According to the potentiometric titration electrode support and the storage box, a lower fixing plate, an upper fixing plate and a limiting sliding rod are arranged in side cavities formed in the two sides of an inner cavity of a storage box body, and a limiting plate and a lifting plate which are fixedly connected to the two sides of an electrode support body are arranged on the limiting sliding rod, a motor and a lead screw which are installed in the side cavities; therefore, the electrode support body can be controlled to ascend and descend in the storage box body.