186 results about "Volumetric flask" patented technology

The invention relates to the field of test and analysis of impurity element content of primary magnesium ingots, in particular to a method for testing impurity element content of primary magnesium ingots by ICP (inductively coupled plasma) spectrometry, which comprises the following steps: firstly adding H2O2 into a magnesium ingot sample to infiltrate the sample, then adding HCl at an interval of less than 1 minute to carry out first reaction, carrying out first heating after the reaction is finished, and then carrying out second heating, cooling to 20-30 DEG C, transferring to a volumetric flask, and fixing the volume by using third-level water to obtain a sample solution; establishing a working curve by using an ICP spectrometer and a standard solution; testing the sample solution; the ratio of the mass of the magnesium ingot sample to the volume of H2O2 to the volume of HCl is 1: (3-10): (30-54), the method fills the standard vacancy of ICP spectrometry analysis of the silicon element in the primary magnesium ingot, a reliable basis is provided for chemical component analysis of the primary magnesium ingot, the test result is surface, and the method for testing the mass fraction of the impurity elements in the primary magnesium ingot provided by the invention has the advantages of high analysis precision, simple operation, high accuracy and high reliability. The analysis period is short, and related chemical varieties are few.

The invention discloses an automatic oil injection device and method for insulating oil breakdown voltage detection, and relates to the technical field of insulating oil detection.The automatic oil injection device comprises an oil injection assembly, a breakdown voltage detection assembly, a temperature measurement and control module and an automatic oil injection module, and the oil injection assembly comprises an oil injection module, an oil cup and an insulating oil liquid level control module; the breakdown voltage detection assembly comprises a to-be-detected oil sample volumetric flask, a filtering module, a first peristaltic pump and a breakdown voltage tester; the temperature measurement and control assembly comprises an oil temperature measurement module and a temperature control module; according to the invention, the traditional manual removal time is shortened, the injector is not easy to damage, the risk of cutting a detector is also avoided, and dangerous factors are reduced in the detection process.

The invention discloses a method for determining the content of trace holmium, thulium and tungsten in rare earth erbium and a compound thereof, which comprises the following steps: placing a rare earth erbium and compound sample thereof in a beaker, and performing a blank test along with a sample; adding nitric acid, heating at low temperature until the sample is completely dissolved, and cooling; transferring into a volumetric flask, adding a cesium internal standard solution, diluting with water, and uniformly mixing; the holmium, the thulium and the tungsten are measured by using an oxygen mode of an inductively coupled plasma tandem mass spectrometer, and the contents of the holmium, the thulium and the tungsten are calculated according to a working curve method. According to the method, the inductively coupled plasma tandem mass spectrometry technology is used, and mass spectrum interference of an erbium matrix on holmium, thulium and tungsten is effectively eliminated by selecting a proper reaction mode and optimizing the flow of reaction gas.

The invention belongs to the technical field of chemical detection, and particularly relates to a method for detecting the content of boron in soil and sediment, which comprises the following detection methods: S1, weighing a sample and putting the sample into a digestion tank; s2, adding a digestion solution into the digestion tank; s3, after uniform stirring, putting the digestion tank into a microwave digestion instrument for microwave digestion; s4, after digestion is completed, closing the microwave digestion instrument, and after the digestion tank is cooled to the room temperature, filtering to remove precipitates; s5, transferring the digestion solution into a volumetric flask, and fixing the volume for subsequent analysis; and S6, analyzing the digestion solution by using ICP-OES / MS (Inductively Coupled Plasma-Optical Emission According to the method for detecting the boron content in the soil and the sediment, ammonium fluoride is used for replacing hydrofluoric acid in boron detection of the soil and the sediment, use of toxic reagents is reduced, mannitol is added, a stable complex is formed by mannitol and boron, and the recovery rate of boron is increased.

The embodiment of the invention discloses a seawater chemical oxygen demand solution standard substance and a preparation method thereof, and belongs to the technical field of standard substances. The method comprises the following steps: dissolving phenol in a proper amount of simulated seawater, transferring into a 1000mL volumetric flask, fixing the volume to a scale by using the simulated seawater, and uniformly shaking to prepare the seawater chemical oxygen demand solution standard substance with the concentration range of 5-500mg / L. According to the invention, high-purity phenol is taken as a solute, simulated seawater is taken as a solvent, and the seawater chemical oxygen demand solution standard substance with good stability is prepared. The validity period of the seawater chemical oxygen demand solution standard substance provided by the invention is as long as 2 years. The value setting mode of the seawater chemical oxygen demand solution standard substance provided by the invention is accurate and reliable, and is not influenced by experimental conditions and the like.

The invention relates to the technical field of digestion, in particular to a pretreatment method for digesting a glass substrate. The pretreatment method comprises the following four key steps: firstly, crushing and grinding a glass substrate sample into powder so as to increase the contact area and accelerate the subsequent reaction speed; next, adding a mixture of ammonium bifluoride and ammonium fluoride and the powder sample into a polytetrafluoroethylene beaker, adding a small amount of water for wetting, and then adding concentrated hydrochloric acid and concentrated nitric acid to effectively promote the dissolution of the sample; then, the beaker is placed on a heating plate to be heated and digested, and after it is confirmed that the sample is completely digested by monitoring the state of the solution, the sample is cooled to the room temperature. And finally, transferring the digestion solution to a volumetric flask, rinsing the original beaker for multiple times with pure water, and diluting to a constant volume. According to the method, the digestion time is remarkably shortened, the background interference is reduced, the detection precision is improved, and the method is particularly suitable for the requirements of high-end analysis equipment such as AAS and ICP.

The invention relates to the field of plant growth regulators, in particular to a conditioner group for improving the grain quality and the rice quality of direct seeding rice and a preparation and use method thereof.The preparation method of a conditioner in the initial heading stage comprises the following steps that 1, 6-benayl aminopurine is dissolved in a diluted hydrochloric acid solution in a assisted mode, and a 6-benayl aminopurine solution is obtained; step 2, adding choline chloride into the solution obtained in the step 1, stirring to obtain a mixed solution, transferring the mixed solution into a volumetric flask, and adjusting the pH value; 3, abscisic acid powder is dissolved with absolute ethyl alcohol, volume metering is carried out after dissolution to form a stock solution, and then PH adjustment is carried out. Two conditioners are included and sprayed in the initial heading stage and the full heading stage respectively, glumous flower degeneration can be reduced, the photosynthetic production capacity of the upper three leaves after flowering can be improved, assimilation substances are promoted to be transferred to grains, especially the filling state of vulnerable grains is improved, and the yield of the seedlings is increased. Finally, the grain number, the maturing rate, the grain weight and the yield are improved, meanwhile, the head rice rate of rice can be improved, and the protein content is reduced, so that the palatability of rice is improved.

The invention discloses an intelligent environment-friendly lime dosage on-site rapid detection device and a use method thereof, and relates to the technical field of lime detection. Comprising a comprehensive control system and an operation treatment system, a liquid crystal screen and a main power switch are installed on the top face above the comprehensive control system, a calculator is installed in the comprehensive control system, and a potassium oxalate volumetric flask, an ammonium chloride volumetric flask and a tail gas treatment device are installed in the operation treatment system. The potassium oxalate volumetric flask, the ammonium chloride volumetric flask and the tail gas treatment device are sequentially arranged from left to right, a reaction container and an electronic scale are mounted outside the operation treatment system and are sequentially arranged from left to right, a stirrer is mounted at the midpoint position of the bottom surface of the reaction container, and four electrodes are spirally and rotatably mounted on the reaction container from bottom to top; and an ultrasonic generator and a thermostat are arranged below the reaction container. The device disclosed by the invention can realize an integrated function of self-stirring, self-titration, self-measurement and self-cleaning, can quickly detect the lime dosage on site, and improves the detection rate and precision.

The invention relates to the field of polyethylene volumetric flask cleaning equipment, and discloses a polyethylene volumetric flask cleaning device which comprises a workbench, a sleeve is movably mounted in the middle of the top end of the workbench, a rotating rod is movably mounted in the sleeve, and four transverse frames are fixedly mounted at the top end of the rotating rod; the bottom of the tail end of the transverse frame is movably provided with a rotary drum, the interior of the rotary drum is movably provided with a magnetic lifting rod, the outer diameter of the lower side of the rotary drum is movably provided with three clamping arms, the tail end of each clamping arm is fixedly provided with a clamping block, and the front side of the top end of the workbench is fixedly provided with a first arc-shaped supporting plate. A water tank is fixedly installed in the middle of the inner side end of the first arc-shaped supporting plate, and a second arc-shaped supporting plate is fixedly installed on the rear side of the top end of the workbench. Feeding, cleaning, drying and discharging can be automatically completed, all-directional cleaning is achieved, clamping is reliable, drying is energy-saving, the working height can be adjusted, and high efficiency and practicability are achieved.

The invention relates to the technical field of element detection, in particular to a method for measuring the manganese content in copper concentrate, which comprises the following steps: weighing a copper concentrate sample with the mass of m in a tetrafluoroethylene beaker, and adding a small amount of water to soak the sample; adding nitric acid and hydrochloric acid, and heating at 200-300 DEG C for 5-10 minutes; then adding perchloric acid and hydrofluoric acid, heating at 200-300 DEG C until the copper concentrate sample is completely dissolved, and cooling to room temperature; adding dilute nitric acid, and heating to dissolve the separated salt crystals to obtain a to-be-detected pre-solution; transferring the to-be-detected pre-solution to a volumetric flask, adding water to dilute the pre-solution to a scale line, and uniformly shaking to obtain a to-be-detected solution; according to the method, a nitric acid-hydrochloric acid-perchloric acid-hydrofluoric acid mixed acid digestion system is adopted, so that the manganese element in the copper concentrate is completely dissolved, and the interference of a complex matrix on manganese determination is effectively solved; by combining the high sensitivity and multi-element analysis capability of the inductively coupled plasma emission spectrometer, a linear standard curve of a manganese element characteristic spectral line and concentration is established, and the accuracy and precision of quantitative analysis are remarkably improved.

A method for obtaining the detection limit of 23 perfluorinated compounds in water relates to the technical field of pollutant detection, and comprises the following steps: step S1, taking a sufficient amount of a water sample and placing the water sample in a fluoride-free volumetric flask to obtain a water sample containing methanol; s2, preparing a water quality sample to be detected; s3, detecting the water quality sample to be detected by adopting a high performance liquid chromatography tandem mass spectrometer; s4, setting an elution program of a mobile phase; and S5, testing, and calculating the concentrations of 23 perfluorinated compounds in the water quality sample to be detected. According to the method, the detection limits of 23 perfluorinated compounds in water are obtained by utilizing a liquid chromatography-triple quadrupole mass spectrometer and adopting an online solid-phase extraction method, so that the detection efficiency is improved, the personal error is reduced, and the consumption of an organic solvent and the use of a traditional solid-phase extraction column are reduced.

The utility model discloses a volumetric flask device. The device comprises a main cavity, an auxiliary cavity, a connecting device, scale marks, a bottle neck and a plug, the upper part of the main cavity is provided with an external thread and a first sealing surface; the auxiliary cavity is located on the upper portion of the main cavity, internally provided with a second sealing face matched with the main cavity and fixed to the main cavity through a connecting device. And the bottleneck is positioned at the upper part of the auxiliary cavity and is integrally communicated with the auxiliary cavity. When the volumetric flask device is used for preparing a solution, the solution does not need to be firstly dissolved and then transferred, and the concentration of the obtained solution is more accurate.

This invention discloses an analytical method for detecting the content of 2,5-dihydroxybenzenesulfonic acid-1-hydroxypropyl ester in pharmaceutical creams using high performance liquid chromatography-tandem mass spectrometry (HPLC-MS / MS). The detection steps are as follows: A certain amount of pharmaceutical cream is transferred to a volumetric flask, a certain amount of methanol is added, and the mixture is heated to disperse it evenly. After cooling to room temperature, the mixture is brought to a final volume, shaken, and centrifuged. The supernatant is then used for detection, and the results are calculated using the external standard method. The detection ions used in this method are 247.1>189.2 and 247.1>139.9. This method is rapid, simple, accurate, reliable, and highly sensitive, and can be used to detect the content of 2,5-dihydroxybenzenesulfonic acid-1-hydroxypropyl ester in creams.

The invention discloses a method for determining the total phosphorus content in ammonium polyphosphate, and relates to the technical field of chemical analysis and detection. The method comprises the following steps: weighing an ammonium polyphosphate sample, putting the ammonium polyphosphate sample into a microwave digestion tube, adding a nitric acid solution, covering and sealing, putting the microwave digestion tube into a microwave digestion instrument for digestion, transferring a digestion solution into a volumetric flask for constant volume, uniformly mixing and filtering, and taking a filtrate as a to-be-tested solution; preparing a phosphorus pentoxide standard series solution; placing the standard series solution and the to-be-tested solution in a sample disc of a continuous flow injection analysis automatic sampler in sequence, setting parameters, operating the equipment for detection, fitting a standard curve according to peak height, calculating the mass concentration of phosphorus pentoxide in the to-be-tested solution, and further calculating the total phosphorus content in the sample. According to the method, microwave closed digestion is utilized, the reaction speed and intensity are higher in the process, the medium-high ammonium polyphosphate digestion is more thorough, a continuous flow injection analyzer is used for automatic sample introduction and determination, manual operation errors are reduced to the maximum extent, the detection flux is high, the speed is high, and consumed time is less.

The utility model relates to the technical field of sampling devices, and particularly discloses an ammonia escape sampling device for detecting an SCR (Selective Catalytic Reduction) honeycomb denitration catalyst, which comprises an outlet pipeline, the outlet pipeline is communicated with a sampling pipeline, one end of the sampling pipeline close to the outlet pipeline is provided with a valve I, and the sampling pipeline is communicated with a liquid injector and a gas injector. A second valve and a third valve are arranged on pipelines between the liquid injector and the sampling pipeline and between the gas injector and the sampling pipeline respectively, the outer side of one end, away from the outlet pipeline, of the sampling pipeline is sleeved with a bubble absorption pipe, a fourth valve is arranged at the bottom of the bubble absorption pipe, and one end, away from the outlet pipeline, of the bubble absorption pipe is communicated with a volumetric flask. The side wall of the bubble absorption pipe is communicated with an air suction pump through a pipeline, and a fifth valve is arranged on the pipeline between the bubble absorption pipe and the air suction pump. According to the utility model, all the devices are hermetically linked, and all the devices are matched, so that the pipeline of the device is sealed, sampling is not exposed in the whole process, the test is accurate, and the use is convenient.

The invention belongs to the field of spectrum chemical analysis, and particularly relates to a detection method for measuring the silver content in crude copper through atomic absorption spectrometry. The method comprises the following specific steps: dissolving with nitric acid, adding bromine water and hydrochloric acid, steaming to be nearly dry, and leaching with hydrochloric acid; if particles which are not completely dissolved exist only by using nitric acid and hydrochloric acid, filtering, adding a saturated ammonium bifluoride solution, nitric acid-sulfuric acid mixed acid and perchloric acid, heating and dissolving, smoking until smoke is exhausted, adding hydrochloric acid for leaching, transferring into a volumetric flask (not separately taken), taking hydrochloric acid as a medium, matching a copper matrix with a silver standard solution, acetylene as fuel gas and air as combustion-supporting gas, and performing gradient elution to obtain the copper-silver alloy. And measuring the silver content on an atomic absorption spectrometer. The method has the characteristics of simplicity in sample pretreatment, high detection result accuracy, good precision, simplicity in operation, high practicability and the like.

The application provides a content determination method of quaternary ammonium salt disinfectant: 1 mL is taken and placed in a 100 mL volumetric flask, diluted to the scale with a mobile phase, 1 mL is taken and placed in a 10 mL volumetric flask, diluted to the scale with a mobile phase, and a test sample solution is obtained; benzalkonium chloride control samples are taken, dissolved and quantitatively diluted with a mobile phase to prepare C12 substituted homologues and C14 substituted homologues solutions, which are used as benzalkonium chloride control sample solutions; decamethylquinolinium chloride control samples are taken, dissolved and quantitatively diluted with a mobile phase to prepare a solution, which is used as a decamethylquinolinium chloride control sample solution; the benzalkonium chloride and decamethylquinolinium chloride control sample solutions are taken, and a chromatogram is recorded; the logarithmic values of the control sample solution concentrations and the logarithmic values of the corresponding peak areas are calculated to obtain a corresponding linear regression equation; the test sample solution is taken, and the content of benzalkonium chloride and decamethylquinolinium chloride in the test sample is calculated by the linear regression equation.

The application discloses a capacity bottle drying device, which comprises a drying box and a turnover box cover hingedly arranged above the drying box, a base plate is arranged on the inner wall of the middle part of the drying box, a bottle body fixing mechanism and a bottle inner drying mechanism are arranged on the base plate, the bottle inner drying mechanism comprises a plurality of bottle mouth lap joint seats arranged above the base plate and corresponding to a plurality of bottle body clamps, air knife pipes capable of entering the inside of the capacity bottles are arranged above the plurality of bottle mouth lap joint seats, the plurality of air knife pipes are connected with a first hot air system through a pipe distributor, a bottle outer drying mechanism is arranged at the bottom of the turnover box cover, the bottle outer drying mechanism comprises a drying cavity arranged at the bottom of the turnover box cover, a plurality of air blowing heads corresponding to the bottle body clamps are arranged at the bottom of the drying cavity in communication, and the drying cavity is connected with a second hot air system through a bellows pipe. The capacity bottle drying device provided by the application can simultaneously perform internal and external drying on a plurality of capacity bottles, time waste is reduced, and the working efficiency is improved.

The application discloses a kind of efficient pretreatment methods for detecting element in extraction system organic phase, it includes the following steps: pipette appropriate amount of measured organic phase to volumetric flask, add appropriate amount of back extraction acid, then add water to 1 / 3-2 / 3 of volumetric flask volume, cover bottle plug; Shake the back extraction of volumetric flask, and stand and separate, then use filter paper to draw and remove upper organic phase, after removing upper organic phase, the remaining aqueous phase is filtered using filter paper and the primary filtrate is discarded, and the filtrate is the sample to be detected, for element analysis detection.The method simplifies the operation process, is simple to operate, high in detection efficiency, and is not easy to contaminate;The organic phase volume used in the pretreatment operation of the method is small, compared with the existing back extraction method of separatory funnel, the amount of organic phase used is one tenth of the back extraction method of separatory funnel, or even less, reducing the waste of organic phase, at the same time, the amount of back extraction acid is reduced, and the amount and consumption of reagent are greatly reduced.

The embodiment of the invention discloses a residual chlorine solution standard substance as well as a preparation method and application thereof, and belongs to the technical field of standard substances. The method comprises the following steps: dissolving a hydrogen peroxide solution in a proper amount of ultrapure water, transferring the solution to a 5000mL volumetric flask, adding a phosphate buffer solution and ethylene diamine tetraacetic acid, diluting the solution to a constant volume by using ultrapure water, filling and sealing the solution into a clean ampoule bottle, and refrigerating and storing the solution in a dark place, and the concentration of the residual chlorine solution standard substance is 10-1000mu g / mL in terms of Cl2. The residual chlorine solution standard substance provided by the invention has excellent storage stability, the validity period is as long as 2 years, meanwhile, in the residual chlorine content detection process, the accuracy of a detection quantity value is ensured, and a more stable and reliable quality control sample is provided for water quality detection.

The invention discloses a method for analyzing contents of aluminum, chromium, nickel, copper, molybdenum, silicon, titanium, vanadium and manganese in lanthanum-iron and cerium-iron alloys, which is characterized by comprising the following steps of: weighing a sample in a beaker, adding salt-nitrate mixed acid, placing the beaker on a low-temperature electric heating plate to dissolve the sample, transferring the sample into a volumetric flask after the sample is dissolved, fixing the volume to a scale by using high-purity water, and measuring the content of the aluminum, the chromium, the nickel, the copper, the molybdenum, the silicon, the titanium, the vanadium and the manganese in the beaker; and uniformly shaking, and measuring aluminum, chromium, nickel, copper, molybdenum, silicon, titanium, vanadium and manganese in the solution by adopting inductively coupled plasma emission spectrometry. According to the method, a working curve is drawn by using a steel standard sample, lanthanum and cerium matrix matching is not needed, and the contents of aluminum, chromium, nickel, copper, molybdenum, silicon, titanium, vanadium and manganese in the lanthanum-iron and cerium-iron alloy are measured by adopting an inductively coupled plasma emission spectrometry. According to the method, the analysis time is greatly shortened, the working efficiency is improved, the environmental pollution is reduced, and the determination process is simple, rapid and accurate.

1. The name of this design product: Automatic volume controller. 2. Purpose of this design product: used to automatically and accurately add liquid to the calibrated scale line of a laboratory volumetric flask. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The invention relates to the technical field of concentration detection of phosphate, in particular to a method for detecting the concentration of phosphate ions in a nickel-free hole sealing tank solution. The detection method comprises the following steps: adding a nickel-free hole sealing tank solution into a quantitative bottle for quantification, adding an ascorbic acid solution and a molybdate solution into a volumetric flask, carrying out a standing reaction at 28-32 DEG C for 15-25 min, determining the light absorption value of the reaction solution at 700 nm by using a spectrophotometer, obtaining the phosphorus content M according to a phosphorus standard curve model, and calculating the phosphate ion concentration P according to a formula. Compared with an existing method for detecting the concentration of orthophosphoric acid through IC equipment, the concentration data measured through the spectrophotometric method is more stable and smaller in difference, the accuracy of concentration analysis of the phosphate ions in the nickel-free hole sealing groove can be achieved, and the situation that materials are scrapped due to the fact that the concentration of the phosphate ions is abnormal in the production process is effectively avoided.

The application discloses a preparation method of trace 10-component phenolic endocrine disruptor solution standard substance, which comprises the following steps: accurately weighing 10 kinds of high-purity phenolic compounds with accurate values, and dissolving the phenolic compounds in a mass spectrometry grade methanol solvent in a nitrogen atmosphere operation box to obtain a dissolved phenolic standard; filling nitrogen into a volumetric flask, pouring the dissolved phenolic standard into the volumetric flask, and dissolving and constant volume of the dissolved phenolic standard in a constant-temperature tank at 20.0 DEG C + / - 0.5 DEG C for 20 min, and then using the mass spectrometry grade methanol solvent to dissolve and constant volume to obtain a constant-volume phenolic solution; gradually diluting the constant-volume phenolic solution to 1 ug / L by using the mass spectrometry grade methanol solvent to obtain a diluted phenolic solution; pre-filling argon into a brown glass ampoule in a nitrogen atmosphere operation box, and then pouring the diluted phenolic solution into the brown glass ampoule, filling argon above the ampoule containing the solution, and fusion sealing the ampoule for refrigeration preservation.

The present application relates to a method for determining high content copper, lead and zinc in polymetallic ore and copper-lead-zinc alloy by ICP-AES, and belongs to the technical field of ICP-AES analysis and testing, and the specific steps are as follows: the polymetallic ore and copper-lead-zinc alloy sample is decomposed into wet salt by aqua regia; then hydrochloric acid-ammonium acetate mixed extraction liquid is added, and the mixture is heated to micro-boiling for 10-15 min; the extracted sample is diluted with deionized water in a 250 mL volumetric flask; the diluted sample is shaken and left to clarify; 5 mL of supernatant solution is taken out with a 10 mL large-volume pipette and placed in a 50 mL colorimetric tube, 5 mL of hydrochloric acid-ammonium acetate mixed extraction liquid is added, and the mixture is diluted and shaken; the obtained sample is subjected to ICP-AES testing to determine the content of copper, lead and zinc. The present application avoids complicated operation, solves the problem of serious low test results caused by mutual influence of lead, copper and zinc during testing, and can improve the testing accuracy of high content copper, lead and zinc in polymetallic ore and copper-lead-zinc alloy.

The utility model discloses an anti-crystallization vehicle urea solution subpackaging device which comprises a working table, a rotating motor is fixedly installed in the working table, a rotating table is fixedly installed at the output end of the rotating motor, a containing groove is fixedly formed in the top face of the rotating table, and a connecting block is driven to move through the arrangement of a lifting mechanism; a liquid conveying cylinder is moved downwards, a liquid conveying pipe is inserted into a packaging volumetric flask, a valve is opened, a urea solution in a liquid storage tank enters the liquid conveying cylinder through a connecting pipe at the moment, the valve is closed, a piston is moved downwards through an electric push rod, and then the urea solution in the liquid conveying cylinder can be completely injected into the packaging volumetric flask. The packaging volumetric flasks filled with the urea solution can be moved away from the position below the infusion tube by starting the rotating motor again, the empty packaging volumetric flasks can be moved to the position below the infusion tube for subpackaging, the packaging volumetric flasks can be conveniently placed and taken, and meanwhile the subpackaging efficiency is improved.

The invention relates to a method for determining hydrazine in carbidobar by derivatization high performance liquid chromatography. Specifically, the invention relates to a method for quality control of Carbidopa as an anti-Parkinson disease drug, and especially relates to a method for determining trace impurity hydrazine in Carbidopa by using derivatization high performance liquid chromatography. In the method, octadecylsilane chemically bonded silica is used as a chromatographic column of a filling agent, and a test solution is prepared by the following steps: taking a to-be-detected test sample Carbidopa raw material medicine, putting the Carbidopa raw material medicine into a measuring flask, precisely adding water, shaking, immediately and precisely adding a diluent containing benzaldehyde and glacial acetic acid, shaking at proper time, immediately adding a proper amount of triethylamine, and uniformly stirring; and diluting to the scale by using a diluent, and uniformly shaking to obtain the test solution. The method provided by the invention can effectively and accurately determine the trace impurity hydrazine in the carbidopa bulk drug. The method provided by the invention has excellent methodological characteristics.

The invention belongs to the technical field of chemical detection, and particularly relates to a method for detecting phosphorus content in high-carbon ferro-chrome by utilizing ICP (inductively coupled plasma), which comprises the following steps: 1) adding red acid into a sample, slowly adding concentrated sulfuric acid, adding perchloric acid after violent reaction is finished, heating to 360-380 DEG C, keeping constant temperature, dropwise adding nitric acid until the mixture becomes green, cooling, reboiling and fixing the volume; 2) establishing a working curve: dissolving 6 parts of high-purity iron and high-purity chromium according to the method in the step 1) until the volume of the volumetric flask is constant; (3) gradually diluting the 1000mg / L phosphorus standard solution according to a set curve point; transferring into a volumetric flask with 6 dissolved parts, introducing ICP (Inductively Coupled Plasma) detection, carrying out single excitation detection for 4 times, averaging, and calculating the phosphorus content according to a calibration curve. The method has the advantages that the phosphorus element in the high-carbon ferro-chrome is detected, the operation is simple, and the popularization is easy. In the detection, four times of single excitation detection are averaged, so that individual points are prevented from drifting due to multiple times of excitation, and the accuracy of a detection result is improved.

The present invention discloses a method for determining chloride ions in electronic grade hydrogen bromide by ion chromatography, comprising the following steps: (1) preparing and analyzing Cl ‑ Standard solution, obtain the working curve of concentration and peak area; (2) Pretreatment of hydrogen bromide sample: connect three washing bottles in series on the hydrogen bromide sampling tube, the first one is a buffer bottle, the second and third ones are absorption bottles filled with 100mL high-purity water, after absorption, combine the obtained hydrogen bromide absorption solution; (3) add alkali solution to adjust the pH value of hydrogen bromide solution to 4-10, and make up the volume with a volumetric flask to prepare the solution to be tested; (4) use ion chromatograph to detect the solution to be tested and obtain the trace amount of Cl in electronic grade hydrogen bromide ‑ The chromatogram of the test was obtained, and the Cl in the test solution was detected according to the external standard method. ‑ Quantitatively obtain Cl in electronic grade hydrogen bromide ‑ The method is simple to operate, has good reproducibility and high sensitivity.

The present invention provides a 3A molecular sieve gas desorption amount determination apparatus, and relates to the field of gas measurement, the 3A molecular sieve gas desorption amount determination apparatus comprises a constant temperature water bath box and a room temperature water bath box, a thermal insulation plate is arranged between the constant temperature water bath box and the room temperature water bath box, the constant temperature water bath box is internally provided with a volumetric flask, the room temperature water bath box is internally provided with a burette, and the burette is connected with the thermal insulation plate. A first connecting pipe is arranged between the burette and the volumetric flask; a fan-shaped cover is arranged on a cover of the constant-temperature water bath box and is in contact with the volumetric flask; a first fixing structure is arranged on one side of the burette, a second fixing structure is arranged at the bottom of the volumetric flask, a comprehensive controller is arranged at one end of the burette, a liquid level meter and a vacuum pump are arranged in the comprehensive controller, and the liquid level meter and the vacuum pump are sequentially connected with the burette. According to the 3A molecular sieve gas desorption amount measuring device, an independent module experiment can be started, all modules can also be started at the same time for batch experiments, and operation is flexible.