111 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 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 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 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 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 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 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.

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 the technical field of element detection, in particular to a method for detecting harmful elements in tattooing ink, which specifically comprises the following steps: S1, sample pretreatment: weighing a tattooing ink sample, adding nitric acid for heating digestion, S2, acid removal and constant volume: heating until complete digestion, continuing heating for acid removal, cooling, transferring into a volumetric flask for constant volume to obtain a to-be-detected solution, and detecting the content of harmful elements in the tattooing ink. S3, instrument detection: uniformly mixing the to-be-detected liquid, and carrying out multi-element simultaneous determination on the to-be-detected liquid by adopting an inductively coupled plasma emission spectrometer, and S4, result analysis: quantitatively analyzing the contents of arsenic, cadmium, cobalt, copper, mercury, nickel, lead, antimony and zinc elements in the tattoo ink sample according to detection signals. The method for detecting the harmful elements in the tattooing ink not only has high sensitivity and accuracy, but also has high efficiency, high flux, strong pertinence and wide applicability, and has important social benefits.

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 invention relates to the technical field of impurities in metal oxides, in particular to a method for detecting impurity elements in tantalum pentoxide, which comprises the following steps: adding quantitative dried tantalum pentoxide powder into a polytetrafluoroethylene digestion bottle; adding hydrofluoric acid and nitric acid, sealing the bottle body, putting the polytetrafluoroethylene digestion bottle into holes of a porous electric heating plate, and carrying out gradient heating to dissolve the tantalum pentoxide powder, so as to obtain a fluorine tantalum salt solution; the fluorine complex tantalum salt solution is transferred into a separating funnel, sulfuric acid is added for oscillation, then an extracting agent is added for oscillation and standing, after complete phase separation, a water phase solution and an organic phase solution are obtained, the water phase solution mainly comprises impurity elements, and the organic phase solution mainly comprises a tantalum matrix; the water-phase solution is collected into a plastic volumetric flask by rotating a cock of the separating funnel; taking a preset amount of water phase solution from the plastic volumetric flask as a to-be-detected sample, and detecting the content of impurity elements in the to-be-detected sample by using an inductively coupled plasma emission spectrometer.

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.