56 results about "Volumetric flask" patented technology

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 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 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.

A volumetric flask supporting device for measuring dencichine in pseudo-ginseng belongs to the technical field of volumetric flask supporting equipment for measuring pseudo-ginseng in pseudo-ginseng, and comprises a fixed base, a positioning groove, a buffer device, a telescopic bracket, a locking jackscrew, a pressing device and a fixed handle column, the device is characterized in that a plurality of positioning grooves are transversely and evenly distributed in the middle of the upper surface of the fixed base, a buffer device is inserted in the circle center of the interior of each positioning groove, and telescopic supports are connected to the outer edge of the upper surface of each positioning groove in a bilateral symmetry mode; a locking jackscrew is inserted in the middle of the rear surface of the telescopic support on the right side, a pressing device is connected between the upper edges of the surfaces of the inner sides of the left telescopic support and the right telescopic support, and a fixing handle column is connected to the middle of the rear surface of the pressing device. When the volumetric flasks are placed in the support, downward force of the volumetric flasks can be buffered, and the volumetric flasks can be prevented from shaking in the support when being carried and applied.

This invention belongs to the field of food testing technology, and particularly relates to a method for determining chloride ions in special medical foods, including the following steps: (1) Sampling: Weigh 1.0g of sample into a graduated plastic tube; (2) Standard curve formulation: Optimize the standard working curve, and according to the optimized standard working curve, measure the standard working solution from low concentration to high concentration using a spectrophotometer, and plot the standard curve with absorbance as the ordinate and chloride ion concentration as the abscissa; (3) Sample pretreatment: Weigh the sample into a special medical food pretreatment device, add water and nitric acid solution, mix thoroughly, seal and soak for extraction, separate solid and liquid, make up the volume of the separated liquid, and let it stand to obtain the test solution; (4) Determination: Measure a certain amount of the test solution into a 100mL volumetric flask, add nitric acid solution and silver nitrate, let it stand, and then measure it at 400nm using an ultraviolet spectrophotometer.

The utility model discloses a kind of anti-toppling volumetric flask racks, including bottom layer supporting plate, middle layer fixed plate, top layer fixed plate, two blocking strips and two side plates, two side plates are relatively arranged left and right;The end of bottom layer supporting plate, middle layer fixed plate and top layer fixed plate is connected together with the inside tenon-and-mortise of side plate;The distance between middle layer fixed plate and bottom layer supporting plate is one half of the bottle body height of entire volumetric flask;Two rows of bottle body containing round holes are set up in front and back on middle layer fixed plate;Two rows of bottle neck inlets and outlets are set up in front and back on top layer fixed plate, and each bottle neck inlet and outlet is L-shaped;Two blocking strips are respectively magnetically attracted and arranged on the two rows of bottle neck inlets and outlets.The anti-toppling volumetric flask rack of the utility model improves volumetric flask rack structure, increases the design installation of magnetic blocking strip, simple operation, solves the problem that volumetric flask is easily toppling, colliding and falling during experiment activity and moving, greatly improves practicality and security.

The utility model relates to the technical field of medicine inspection and analysis, and discloses an analysis titration device for medicine inspection, which comprises an operating table, a protective door is rotatably connected to the front side of the operating table, a fixing mechanism is arranged at the top of the operating table, a titration mechanism is arranged at the top of the operating table, and the fixing mechanism comprises a first servo motor. The first servo motor is fixedly connected to the inner bottom of the operation table, the rear side of the first servo motor is fixedly connected with a worm, the left side of the worm is meshed with a worm gear, the worm gear is internally and fixedly connected with a rotating rod, the top of the rotating rod is fixedly connected with a placement table, and the top of the placement table is provided with a volumetric flask. By means of the arranged fixing mechanism, when medicine needs to be inspected and analyzed, a first servo motor, a worm, a worm gear and a rotating rod are matched, rotation of the containing table can be achieved, a volumetric flask is conveniently driven to rotate, and a second servo motor drives a two-way threaded rod to rotate.

The present application relates to the technical field of traditional Chinese medicine analysis, and particularly relates to a quality control method of a traditional Chinese medicine composition. The quality control method comprises the following steps: (1) preparing reference substance solutions: preparing baicalin reference substance solutions and chlorogenic acid reference substance solutions respectively; (2) preparing test sample solutions: preparing a traditional Chinese medicine solution from the traditional Chinese medicine composition, precisely taking 2 mL of the traditional Chinese medicine solution into a 50 mL brown volumetric flask, adding methanol to the calibration mark, and mixing; (3) determining HPLC conditions: optimizing and determining the high performance liquid chromatography (HPLC) conditions of baicalin and chlorogenic acid respectively; and (4) determining methods: precisely taking 20 μL of each of the above reference substance solutions and test sample solutions, and injecting into a HPLC instrument for determination. The method can effectively and quickly control the quality of the traditional Chinese medicine composition.

The invention discloses a pretreatment method for detecting an active substance epicafucatechin in radix ephedrae formula granules. The pretreatment method comprises the following steps: (1) crushing and sieving the radix ephedrae formula granules, and collecting screen underflow; (2) putting a proper amount of crushed ephedra root formula granules into a conical flask with a plug, adding ultrapure water, performing ultrasonic extraction in an ultrasonic machine, standing to room temperature, adding water to complement the weight, and filtering to obtain a filtrate; (3) extracting a proper amount of filtrate with water-saturated n-butyl alcohol, and combining extract liquor; and (4) evaporating the n-butyl alcohol extract to dryness, dissolving residues with methanol, metering the volume in a 10mL volumetric flask, and filtering to obtain a sample to be detected. The method can effectively guarantee the detection stability and accuracy of the active substance epialfallocatechin in the Chinese ephedra root formula granules.

The invention relates to a sample pretreatment method for pyrite elemental analysis. The method comprises the following steps: firstly, preparing a pretreatment agent: activating the surface of carboxymethyl chitosan by NHS / EDC, and then reacting with ethanolamine phosphate; secondly, a pyrite sample is taken and smashed into particles, the particles, NaOH, NaNO3 and a pretreatment agent are fully ground into powder, then the temperature is increased to 180-250 DEG C and then increased to 350-450 DEG C for heat preservation, sintered solids are transferred into a beaker, a hot nitric acid solution is added, the solids are dissolved through ultrasonic treatment, the solids are filtered into a volumetric flask after being cooled, and a to-be-tested sample is obtained after the volume is fixed through dilute nitric acid; according to the treatment method, use of a large amount of concentrated acid and perchloric acid is avoided, the reagent dosage is small, and environment friendliness is achieved; the recovery rate of 95% or above can be ensured when the treated sample is measured by instruments such as ICP-MS, the maximum RSD value does not exceed 5% compared with a standard value, and the accuracy is good.

The invention discloses a quantitative detection method for nitrate radicals in a tin hydroxide sample and application thereof, and belongs to the technical field of chemical analysis, and the method comprises the following steps: water extraction: adding 50 mL of deionized water into a tin hydroxide sample to be detected, uniformly mixing, carrying out ultrasonic treatment at 50 DEG C for 15 min, cooling to room temperature, transferring the mixture into a 200 mL or 500 mL volumetric flask, adding deionized water to a scale line, and carrying out water extraction; obtaining a mixture; solid-liquid separation: filtering the mixture through a 0.45-micron filter membrane of a diaphragm vacuum pump to obtain a clarified extract; and ion chromatography detection: injecting the extract liquor into an anion exchange chromatographic column of an ion chromatograph, and quantitatively detecting nitrate radicals through a suppression type conductivity detector. The pretreatment is simple, and the detection is high-throughput and automatic; the sensitivity is high, the detection limit is low, and the anti-interference performance is strong; detection data are accurate, and production process requirements are met.

The utility model relates to a drying and blowing integrated placing cabinet for placing volumetric flasks, which consists of a drying area and a blowing area, and is characterized in that the drying area and the blowing area are separated by a cabinet plate to form two independent cavities, a plurality of layers of first placing frames are arranged in the drying area, and a plurality of layers of second placing frames are arranged in the blowing area. Heating strips or heating blocks are installed on the two side walls of the periphery of the first containing frame, a plurality of layers of second containing frames are also arranged in the purging area, water receiving trays are arranged below the second containing frames, through holes are formed in the sides, away from the cabinet plate, of the second containing frames, the through holes are located between the second containing frames and the water receiving trays, and ventilation pipes can be inserted into the through holes; the ventilation pipe is connected to an external blowing pump, after the ventilation pipe is inserted into the through hole, the ventilation pipe is upwards inserted into the inverted volumetric flask to start blowing operation, a through hole is also formed in the top of the upper portion of the second containing frame, and a fan is placed in the through hole. The device is simple and reasonable in overall structure, practical and convenient.

The application discloses a rapid detection method of neutral defatting agent, acid solution is quantitatively added in a certain volume of defatting liquid, the higher the defatting agent concentration is, the more acid is consumed, that is, the higher the pH value is, and vice versa, then the measured pH value is nonlinearly polynomially fitted with the defatting agent concentration to obtain a relationship function of both, and then the defatting agent concentration in the defatting liquid on site is calculated by using the relationship function; the application adopts common laboratory equipment and vessels such as a pH meter, an adjustable pipette and a volumetric flask, does not need to use special equipment and devices, is low in cost and simple in operation; the operation process of the application is short, the requirement for the operation experience of personnel is not high, the application is easy to master, the defatting liquid concentration adjustment time is effectively shortened, the work efficiency is improved, and the problem of low accuracy of the neutral defatting agent concentration determined by the weight method and the titration method is solved.

The application provides a capacity bottle fixing device, which comprises a base, an adjusting piece and an elastic drawstring; the base is provided with a groove for accommodating the bottom of the capacity bottle; the adjusting piece is slidingly arranged on the base; the middle part of the elastic drawstring is wound around the middle part of the capacity bottle, and at least one end of the elastic drawstring is connected with the adjusting piece. The overall structure of the application is small in size, flat in structure, small in occupied space, convenient to carry and store; the base is provided with a groove which is matched with the bottom of the capacity bottle in shape, so that the capacity bottle can be placed more stably and the shaking is reduced. The adjusting piece can slide along the base, and the tightness of the elastic drawstring can be adjusted by changing the position of the adjusting piece to adapt to capacity bottles of different specifications. The elastic drawstring has good elasticity, and when it is wound around the middle part of the capacity bottle, it can firmly fix the capacity bottle and will not cause damage to the capacity bottle due to excessive extrusion, thereby improving the applicability and safety of the capacity bottle fixing device.

The application provides a device for measuring the density of water film on the surface of soil particles and the specific gravity, which comprises a vacuum saturation cylinder with a sealing cover arranged at the upper end, an electronic balance arranged in the saturation cylinder, a magnetic stirrer and a temperature control box with an open top arranged above the electronic balance in sequence, a narrow-neck glass volumetric flask arranged in the temperature control box, a temperature controller and benzyl silicone oil, and a camera and a computer data acquisition system; the narrow-neck glass volumetric flask comprises an upper part with a narrow neck and a scale and a lower part communicated with a liquid supplementing pipe, the upper part and the lower part are separable and can be connected by a sealing washer, the narrow neck and the scale of the narrow-neck glass volumetric flask extend upwards beyond the top of the temperature control box and the vacuum saturation cylinder, the liquid level is photographed in real time by the camera and the data is transmitted to the computer data acquisition system for analysis and calculation. The application provides a new way for measuring the density of water film on the surface of soil particles and the specific gravity.

The utility model belongs to the technical field of wastewater monitoring equipment, and particularly relates to chemical oxygen demand tester calibration equipment for wastewater monitoring, which comprises a shell, a partition plate, a plurality of volumetric flasks, a stirring component, a hopper, a feeding component, a driving component, a supporting and guiding component, a digester, a plurality of test tubes, a plurality of heating seats and an adjusting component, the partition plate is fixedly installed on the inner side wall of the shell, the volumetric flasks are all fixedly installed on the top side of the partition plate, the stirring assembly is arranged on the inner wall of the top of the shell and matched with the volumetric flasks, and the driving assembly is arranged on the shell and connected with the stirring assembly. The feeding assembly is arranged above the shell and connected with the stirring assembly, and the hopper is arranged on the top of the shell and connected with the stirring assembly. The device is reasonable in design, can efficiently prepare and manufacture a standard solution, is convenient to take and place the solution and a sample, and has the advantages of simple structure, convenience in operation and high calibration precision.

The application relates to a sample pretreatment method for pyrite element analysis. First, a pretreatment agent is prepared: carboxymethyl chitosan is activated on the surface through NHS / EDC, and then reacts with phosphoethanolamine to obtain the pretreatment agent; secondly, a pyrite sample is crushed into particles, and is fully ground into powder together with NaOH, NaNO3 and the pretreatment agent; then, the temperature is increased to 180-250 DEG C and then to 350-450 DEG C for heat preservation; the sintered solid is transferred into a beaker, hot nitric acid solution is added, ultrasonic is used to dissolve the solid, and after cooling, filtration is carried out into a volumetric flask, and dilute nitric acid is used for constant volume to obtain a sample to be tested. The treatment method avoids the use of a large amount of concentrated acid and perchloric acid, the reagent consumption is small, and the method is environment-friendly; the treated sample is determined by an ICP-MS instrument and the like, and the recovery rate can be ensured to be above 95%; compared with a standard value, the RSD value is not more than 5%, and the accuracy is good.

The application provides a shaking device for shaking a volumetric flask, which comprises a mounting frame, a clamping mechanism, a pressing mechanism and a rotating mechanism. The clamping mechanism comprises a first driving member and a clamping assembly. The first driving member is connected to the mounting frame. The clamping assembly is connected to the output end of the first driving member, so as to clamp or release the volumetric flask through the first driving member. The pressing mechanism comprises a second driving member and a pressing member. The second driving member is connected to the mounting frame. The pressing member is connected to the output end of the second driving member and can press or release the mouth of the volumetric flask when the clamping assembly clamps the volumetric flask. The rotating mechanism comprises a third driving member and a transmission member. The transmission member is respectively connected to the output end of the third driving member and the mounting frame. The third driving member is used to drive the transmission member to drive the mounting frame to rotate. The shaking device can improve the sealing performance of the volumetric flask during the shaking process, so as to reduce the splashing of the solution.

The application provides a kind of determination method of small broken material surface metal impurity of polysilicon, and the method comprises the following steps: taking small broken material sample of polysilicon in a beaker, adding leaching solution, and digesting; taking the digested sample, cooling to room temperature, and transferring into a volumetric flask, then adding HNO3 for constant volume; shaking the volumetric flask, mixing the solid phase and liquid phase uniformly, and then centrifuging; after centrifugation, taking the supernatant to make a standard curve by standard addition method, the first addition amount of the standard curve should be close to the element content in the sample, and a blank is also prepared; the ICP-MS instrument is tuned to be optimal, the standard addition concentration is taken as the abscissa, the measured ion count CPS value is taken as the ordinate, the standard curve is drawn, and the sample is measured. The application avoids secondary pollution, and does not change the volume of acid leaching solution, and also does not have the problem of incomplete flushing of element impurities.

The application provides a squalene fermentation liquor and a method for determining the content of extracted process sample acetone, n-heptane, ethanol and squalene, relates to the field of chemical industry, and specifically comprises the following steps: S1, preparing a test solution: determination of acetone, n-heptane and ethanol: accurately weighing n-propanol and a sample, and shaking to obtain; determination of squalene: accurately weighing squalene and n-propanol in a volumetric flask, adding ethyl acetate to the scale, and shaking to obtain; the test solution is detected by using a gas chromatography method, and the content of acetone, n-heptane, ethanol and squalene is calculated by using an internal standard method; the linear relationship between the theoretical concentration and the detected concentration in the concentration range is investigated, ethanol r=0.999, the average recovery rate is 101%; acetone r=1.000, the average recovery rate is 99%; n-heptane r=1.000, the average recovery rate is 100%; and squalene r=1.000, the average recovery rate is 100%.

The invention provides a method for measuring the moisture content of an anticorrosive coating based on gas chromatography, which comprises the following steps: carrying out gradient dilution and constant volume on water by using a diluting solvent to prepare a plurality of standard solutions; carrying out gradient dilution and constant volume on the internal standard substance by using a diluting solvent to prepare an internal standard solution; placing the standard solutions with different volumes in a volumetric flask, adding a quantitative internal standard solution, and supplementing a diluting solvent to a target volume to obtain a plurality of groups of working solutions; performing gas chromatography detection on each group of working solutions by adopting a single-point relative response factor test method to obtain the peak area of water, the peak area of the internal standard substance and the relative response factor of water; taking the peak area ratio as an abscissa and the relative response factor as an ordinate, constructing a plurality of candidate functions based on a preset function, and obtaining a fitting curve expression; calculating goodness of fit of each candidate function, and selecting the candidate function with the highest goodness of fit as a target function; measuring a to-be-measured sample to obtain target data, and substituting the target data into the target function to obtain the moisture content. The determination method improves the accuracy of the moisture content test result.

The utility model discloses a high pressure water spray inflatable volumetric flask brush relates to experimental apparatus technical field, including the limit cover, the limit cover extrusion is in the conical bottle bottle mouth, the limit cover upper end is equipped with the fixed base, the fixed base sliding connection handle, the limit cover below is equipped with the cleaning cylinder, the cleaning cylinder surface is equipped with a plurality of openings, the opening side direction is equipped with a plurality of cleaning cotton, be equipped with the cleaning structure on the fixed base, through repeatedly pressing handle guide block drive transmission ring transmission, transmission ring drives the cleaning cylinder rotation, the cleaning barrel drives the cleaning cotton rotation, and the cleaning cotton and conical bottle inner wall carry out sufficient friction cleaning, and the convenient narrow mouth's conical bottle is cleaned, and the piston block reciprocating motion is driven to the transmission block, and the piston block is drawn to the cleaning cylinder to the cleaning liquid in the upward stroke, and the piston block downward stroke then pressurizes to liquid, makes it from the opening high -speed spray flushes conical bottle inner wall, and the cleaning efficiency is improved.

The application discloses a kind of static electricity removal devices, including box, positive and negative rotation belt conveying line, blocking mechanism and static electricity removal mechanism;Several protrusions are formed above the belt of positive and negative rotation belt conveying line, and the blocking mechanism includes bidirectional drive assembly arranged in the rear side of the inside of the box and two stop rods for forming blocking to volumetric flask respectively connected on two drive parts of bidirectional drive assembly;Static electricity removal mechanism includes ion fan arranged at the top of the box, translation drive assembly arranged on the inner wall on the top of the box along left and right direction, lifting drive assembly connected on translation drive assembly, turnover drive assembly connected on lifting drive assembly and blowing part installed on turnover drive assembly and connected with ion fan through telescopic bellow, the application can transport multiple volumetric flasks into the box together and perform multi-angle all-around ion blowing at one time, improve the quality of static electricity removal, and the working efficiency is higher.

The invention belongs to the technical field of Li2TiO3 microsphere detection, and discloses a method for detecting chemical components in Li2TiO3 microspheres, a determination method is established on an ICP-OES inductively coupled plasma spectrometer according to optimal detection parameters, standard solutions with different concentrations are prepared, a lithium metatitanate microsphere sample is weighed and placed in a polytetrafluoroethylene beaker, hydrochloric acid with a set amount is added, and a sample solution is obtained; the method comprises the following steps: taking a standard solution, a blank solution and a sample solution, heating and dissolving until the solution is clear, cooling to room temperature, transferring a sample solution into a volumetric flask, diluting with hydrochloric acid and uniformly shaking, transferring a part of the solution into another volumetric flask, diluting with hydrochloric acid and uniformly shaking to be detected, and respectively determining the contents of impurity elements and main component elements in the standard solution, the blank solution and the sample solution on ICP-OES (Inductively Coupled Plasma-Optical Emission Spectrometer). The method for detecting the chemical elements in the lithium metatitanate microspheres is established for the first time, the method for determining other impurity elements in lithium metatitanate is mainly supplemented, the dissolution mode is improved, and the influence of the acid viscosity of a dissolved sample on a spectrograph is reduced.

The utility model provides a pretreatment device for measuring the content of carbonyl compounds in methanol, which comprises a shell, a capping device, a liquid conveying device, a liquid adding device and a turntable oscillating device. According to the device, independent cap removing and cap covering operations can be carried out on the volumetric flasks through mutual cooperation of the cap covering device and the rotating disc oscillation device, more importantly, through mutual cooperation of the devices, the pretreatment process of the methanol solution containing the carbonyl compounds can be fully automatically completed under unified regulation and control of the control assembly, and convenience is provided for subsequent determination. Compared with the prior art, the device can realize whole-course automation, does not need manual intervention, is high in precision, safe and reliable, and can meet the requirements of the modern industry on precision and efficiency.

The invention provides an automatic constant volume device which comprises a shake-up mechanism, a liquid adding mechanism, a camera lifting mechanism and a cleaning mechanism, the shake-up mechanism comprises a clamping jaw assembly used for clamping a volumetric flask and a shake-up assembly, and the shake-up assembly is connected to the clamping jaw assembly; the liquid adding mechanism comprises a liquid adding pipe and a driving assembly, and the driving assembly is connected to the liquid adding pipe and can drive the liquid adding pipe to move; the camera lifting mechanism is connected to the liquid adding mechanism and used for detecting and tracking the liquid level of the volumetric flask from bottom to top. The cleaning mechanism comprises a first cleaning tank, a second cleaning tank, a liquid inlet pipeline and a liquid outlet pipeline, the first cleaning tank is communicated with the second cleaning tank, the liquid inlet pipeline is communicated with the first cleaning tank, the liquid outlet pipeline is communicated with the second cleaning tank, and the liquid adding pipe can be driven by the driving assembly to be at least partially inserted into the first cleaning tank or the second cleaning tank; according to the automatic constant volume device, the liquid adding pipe can be cleaned after liquid adding is completed, and the accuracy of reagent components and reagent amount during multiple times of liquid adding is improved.

The invention discloses a method for measuring the content of calcium fluoride in a desulfurizing agent, and belongs to the technical field of analytical chemistry and metallurgical detection. The method comprises the following specific steps: grinding, sieving and drying a desulfurizer sample to obtain a sample; weighing a sample material, adding a calcium-containing acetic acid solution, placing at normal temperature and intermittently stirring to selectively dissolve calcium oxide while calcium fluoride is basically insoluble; adding perchloric acid, heating until concentrated white smoke is emitted, and removing fluorine ions in the solution; acidifying, heating to dissolve salts, cooling, and then transferring to a volumetric flask for constant volume; measuring the spectral intensity of the test solution under a calcium element characteristic spectral line by using ICP-OES; and calculating the calcium content according to a pre-drawn calcium element working curve, and converting the calcium content into the calcium fluoride mass fraction. Through the pretreatment process of normal-temperature selective dissolution of calcium-containing acetic acid and fluorine removal of perchloric acid, transmission interference and spectral line interference of fluorine ions on ICP-OES calcium measurement are effectively eliminated, and the method is suitable for wide-range measurement of the content of calcium fluoride in the desulfurizing agent.