76 results about "Erlenmeyer flask" patented technology

The invention discloses an extraction method of rose flavonoids, which comprises the following steps: S1, crushing selected dry Hetian rose buds, and storing for later use; s2, accurately weighing 1g of rose powder and putting the rose powder into a conical flask; s3, then, according to the material-liquid ratio of 1: 40, 40% ethanol is used as a solvent, and the materials are poured into a conical flask to be mixed; and S4, finally, soaking in a constant-temperature water area, extracting for 2 hours, and finally, taking supernate for later use. According to the invention, the solid-liquid ratio of 1: 40 ensures that the rose powder is fully infiltrated by an enough solvent (40% ethanol). Under the proportion, the ethanol can be in full contact with target components (such as flavonoid compounds and the like) in the rose powder. Each 1g of rose powder is surrounded by 40ml of solvent, so that target components have more opportunities to be dissolved out of powder particles to enter the solvent, and the extraction completeness can be improved compared with the condition that a feed liquid is relatively small.

The utility model discloses a COD (Chemical Oxygen Demand) digestion device, relates to the technical field of water quality detection instruments, and solves the problems that when the existing COD digestion device is not used, a conical flask and a return pipe are usually directly placed on the COD digestion device, no protective device is arranged outside the conical flask and the return pipe, and external dust directly falls on the device when the conical flask and the return pipe are placed for a long time, so that the subsequent use is influenced. According to the technical scheme, the problems that a conical flask, a backflow pipe and other glassware are damaged due to the fact that the conical flask and the backflow pipe are easily touched by mistake, and using is inconvenient are solved, the device comprises a groove body, two L-shaped supports and a main machine body, the two symmetrical L-shaped supports are fixedly installed on the upper surface of the rear side of the groove body, and the bottom of the main machine body is fixedly connected with the top planes of the L-shaped supports. According to the utility model, through the matching design of the two L-shaped protective plates and the back plate, the conical flask and the return pipe in the COD digester are sealed and shielded, so that external dust is not easy to directly fall on the conical flask and the return pipe, and the follow-up use is facilitated.

The invention discloses a method for carrying out nine-fold breeding by utilizing female gametes, and relates to the technical field of biological breeding. Comprising the following steps: step 1, pollinating hexaploid persimmon pollen to a'rattan royal house 'containing 2n eggs; 2, collecting young fruits which are born for 65-70 days after pollination, stripping seeds, putting the seeds into a sterilized triangular flask, treating the seeds for 30 seconds in an ultra-clean workbench by using 70% ethanol, pouring out the seeds, adding a 1% NaClO solution, soaking the seeds for 10 minutes, and shaking the seeds once every 3-4 minutes. According to the method for carrying out nine-fold breeding by utilizing female gametes, in persimmon breeding, compared with a 2n pollen path, the 2n egg path is higher in feasibility, 2n eggs and complete male germplasm with good pollen traits are hybridized, pollination populations are expanded, and polyploidy seedless materials can be obtained.

The invention discloses a rapid detection and on-site treatment method for ammonia and black oil in fly ash, which comprises the following steps: 1) weighing 200g of fly ash from the batch of fly ash, putting the fly ash into a conical flask, adding 80g-90g of water for stirring, and stirring; (2) after stirring is completed, covering a conical bottle opening with test paper soaked with a 1% phenolphthalein alcohol solution; 3) if the test paper turns red, determining that ammonia with relatively high content exists; 4) standing for 8-10 minutes, and observing whether black oil exists on the surface of the neat paste; 5) after the detection is completed, treating excessive ammonia and black oil in the fly ash; according to the present invention, the ammonia content is rapidly detected by using the test paper impregnated with the 1% phenolphthalein alcohol solution, the black oil is observed by standing, and the concrete stirring and vibrating process is combined so as to achieve the real-time determination and the emergency treatment of the fly ash pollutants, such that the concrete structure quality is improved, and the fly ash field detection method is supplemented.

This invention discloses an extremely salt-tolerant halophilic bacterium, HD16, which can grow under extreme salinity conditions up to 4.0 M sodium chloride (approximately 230 g / L sodium chloride) and also exhibits high alkalinity tolerance, surviving at pH 7–11. Therefore, it is predicted to have broad application prospects in wastewater treatment and other fields. Furthermore, it can be used to produce polyhydroxyalkali (PHA). When cultured in a 500 ml Erlenmeyer flask, the cell dry weight yield reaches 9.45 g / L, with PHA accounting for 72.97% of the bacterial dry weight. The extreme salt tolerance and high alkalinity tolerance of this strain enable it to efficiently accumulate polyhydroxyalkali esters under open, non-sterile conditions.

The utility model relates to the field of malt physicochemical index detection, and discloses a distillation extraction device for detecting peat phenol value in peat malt, which comprises a support II, a support I and an electric jacket, the outer side of the support II is fixedly connected with a bottom support, the middle part of the bottom support is provided with a condenser pipe, the inside of the condenser pipe is fixedly connected with a coiled pipe, and the coiled pipe is fixedly connected with the support I; a distiller is installed on the outer side of the first support through a chain clamp, a distiller cover is installed on the top of the distiller, a water outlet and a water inlet are sequentially and fixedly connected to the outer side of the condensation pipe from top to bottom, and a conical flask is arranged under the coiled pipe. According to the utility model, the technical scheme of a distillation condensation mode is adopted, so that total phenols in malt can be continuously and uniformly collected. According to the scheme, the whole collection process does not exceed 20 minutes, and the distillation water can be continuously supplemented, so that the efficiency is greatly improved. Compared with the problems of low collection efficiency and complex operation in the prior art, the scheme greatly simplifies the experimental process and improves the overall working efficiency.

The invention relates to a method for detecting the content of white oil in polystyrene, which is applied to the field of polystyrene resin detection and comprises the following steps: S1, weighing a polystyrene sample, putting the polystyrene sample into a conical flask with a plug, adding methylbenzene into the conical flask with the plug, and oscillating and dissolving; s2, putting the conical flask with the stopper into a warm water bath, and meanwhile, adding a precipitator into the conical flask with the stopper to precipitate a polymer; s3, adding a precipitant while shaking when the precipitant is dropwise added, and quickly cooling after the precipitant is completely precipitated; s4, filtering by using suction filtration equipment, collecting the filtered solution, concentrating to obtain a concentrated sample solution, and weighing the concentrated sample solution; and S5, sucking a proper amount of concentrated sample liquid by using a microsyringe, then injecting the concentrated sample liquid into a chromatographic instrument, and determining, by accurately controlling precipitation conditions and a separation process, the problems of white oil wrapping by precipitation, filter membrane blockage and insufficient detection limit in a traditional method are solved, and high-precision and high-repeatability white oil content detection is realized.

The utility model relates to an improved nitrogen distillate absorption device, which comprises a distillation flask, a splash-proof ball tube, a guide tube, a condensing tube and a conical flask with double connecting balls which are connected in sequence, and a dropping funnel is arranged between the distillation flask and the splash-proof ball tube, and is characterized in that the distillation flask is provided with a temperature control device, the guide tube is U-shaped, and the condensing tube is arranged in the conical flask. The conical flask with the double connecting balls is connected to the lower end of the condenser pipe, and the opening of the conical flask with the double connecting balls is S-shaped. The gas absorption and titration device is simple, clear and accurate, and solves the problems that in the prior art, the heating temperature is too high, the temperature control is unstable, and the heating is not uniform; the gas flow speed is too high, so that the absorption is incomplete; the solution absorbed by the conical flask is easy to splash out, and system errors are easy to generate, so that the test is accurate.

The invention provides a traditional Chinese medicine extract detection method, and relates to the field of extract detection. Comprising the following steps: S1, precisely weighing M1 g of a test sample, and adding the test sample into a conical flask; s2, adding 100 mL of an ethanol solution into the conical flask, and sealing the conical flask opening; s3, preliminarily shaking up the solution system in the conical flask, then fixing the conical flask on an oscillator, setting the oscillation time to be 6 hours and the frequency to be 120 Hz, and then standing for 18 hours; s4, filtering the solution system in the conical flask, and precisely measuring 20mL of filtrate; s5, drying the evaporation dish to constant weight, weighing the weight of the evaporation dish, and recording the weight as M4; adding the filtrate weighed in the step S3 into a dry evaporation dish, drying to constant weight, and recording as M5; and S6, calculating the content of the extract in the test sample. According to the detection method, the cost of inspection personnel is effectively reduced, the inspection efficiency is improved, personnel errors can be effectively reduced, and the time utilization rate of inspection is improved.

The invention discloses a method for detecting Fe < 2 + > and Fe < 3 + > in a zinc plating solution, which comprises the following steps: putting a zinc plating solution test solution into a conical flask, then adding hydrochloric acid and a copper sulfate solution, heating, taking down and slightly cooling to obtain a test solution; adding an isatin indicator into the test solution, uniformly shaking, then dropwise adding a titanium trichloride solution until the test solution becomes yellow from blue green, adding excessive titanium trichloride solution after the test solution is stable, adding distilled water, cooling, standing, adding sulfuric acid-phosphoric acid mixed acid after the test solution is obviously blue, then dropwise adding a sodium diphenylaminesulfonate indicator solution, and uniformly shaking; titrating with a potassium dichromate standard titration solution until the test solution is purple, and calculating to obtain the total iron content; and measuring the content of Fe < 2 + >, and calculating the concentration component of Fe < 3 + > according to the total iron content and the concentration component of Fe < 2 + >. The concentration of Fe < 2 + > and Fe < 3 + > can be monitored in real time, anode passivation is prevented, the production quality is controlled, the operation is convenient, the test time is short, and the accuracy of an analysis result is high.

1. The name of the design product: conical bottle. 2. The use of the design product: bottle for carrying drinking water outside. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

This invention discloses a method for detecting hydrogen deuteride after water-hydrogen isotope liquid-phase catalytic exchange. The apparatus used in this method includes a first Erlenmeyer flask, a metering pump, a catalytic exchange bed, a flow meter, and a time-of-flight mass spectrometer. The detection process is as follows: a mixture of heavy water and purified water is filled into the first Erlenmeyer flask; a hydrophobic catalyst and hydrophilic filler for the isotope exchange reaction are filled into the catalytic exchange bed; the mixed water enters the catalytic exchange bed from the top and undergoes an isotope exchange reaction with hydrogen gas entering from the bottom of the bed; the deuteride gas after the exchange reaction is directly introduced into the time-of-flight mass spectrometer for detection via the flow meter. This method can monitor the changing trend of deuteride gas after water-hydrogen isotope liquid-phase catalytic exchange online. Simultaneously, the performance of the catalyst, the packing ratio, and the packing method can be examined, thereby further guiding the process. This method features fast analysis speed and high sensitivity.

The utility model discloses an H2S precipitation test device capable of detecting pH-electrode potential on line. The H2S precipitation test device comprises a sulfuric acid dropwise adding system; a sulfuric acid adding port of the H2S gas preparation system is connected with the sulfuric acid dropwise adding system; a gas input port of the H2S precipitation system is connected with a gas output port of the H2S gas preparation system; the residual H2S absorption system is connected with a tail gas outlet of the H2S precipitation system; the device further comprises a pH-electrode potential detection system. The pH-electrode potential detection system comprises a second peristaltic pump, and the inlet end of the second peristaltic pump is connected with a guide pipe arranged in the H2S precipitation system; a guide pipe in the third conical flask is connected with the outlet end of the second peristaltic pump; and the detection end of the pH-electrode potentiometer is arranged in the third conical flask.

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.

A method for the microwave preparation of nano-nickel through chemical reduction in an alkaline environment is disclosed. This invention addresses the problems of complex processes and high energy consumption in existing nano-nickel preparation methods. The steps of this invention include: Step 1, preparing an alkaline solution; placing an ammonia solution in a conical flask and adding a magnetic stirrer; Step 2, adding a nickel salt; adding the nickel salt to the conical flask and stirring until completely dissolved; Step 3, adding a reducing agent; adding the reducing agent to the conical flask and stirring evenly; Step 4, conducting a microwave reaction; placing the conical flask in a microwave reactor for the microwave reaction; Step 5, after the reaction is complete, removing the conical flask, separating the precipitate, washing, and drying to obtain nano-nickel powder. This invention belongs to the field of nanomaterial preparation technology.

The utility model provides a kind of titration device for drug research and development, it is related to the field of pharmaceutical processing equipment, it includes: bottom plate, bottom plate top is used to place conical flask;Stand, bottom plate top is equipped with stand, stand one side is equipped with mounting ring, for the clamping fixation of burette;Clamping assembly, clamping assembly is equipped on the inner wall of mounting ring, for the clamping fixation of burette;And mixing assembly, mixing assembly is equipped on the top of bottom plate, for the mixing of conical flask.This kind of device cooperates through the synergistic effect of clamping assembly, realizes the real-time posture fine adjustment and self-adaptive clamping of burette, adjusts motor based on gyroscope feedback data dynamic control mounting ring angle, offset caused by compensating external force disturbance, ensure that burette is always in vertical equilibrium state;The integrated design of mixing assembly in combination with antiskid component improves the mixing efficiency and fixed safety of reaction vessel.

The present application relates to the technical fields of anaerobic biological toxicity experiment, and discloses an automatic sample feeding device for industrial wastewater anaerobic biological toxicity evaluation, which comprises a conical flask for temporarily storing anaerobic sludge samples and nutrient solution, and further comprises: a storage box, which is internally provided with a storage space for storing anaerobic sludge samples and nutrient solution; a gas storage tank, which is arranged on the side surface of the storage box and internally filled with high-pressure nitrogen; a nitrogen gas conveying assembly, which is arranged on the gas storage tank and penetrates and extends to the inside of the storage box, and is used for aerating the anaerobic sludge samples in the storage box and realizing sludge homogenization through stirring; and a sample feeding assembly, which is arranged on the storage box and communicates with the storage box, wherein the sample feeding assembly is provided with two sample feeding assemblies for respectively feeding anaerobic sludge samples and nutrient solution into the conical flask. The automatic sample feeding device and method for industrial wastewater anaerobic biological toxicity evaluation aim to simplify the exhaust process, reduce the contact between microorganisms and air, and improve the experimental efficiency and result accuracy.

The device comprises a conical flask and a glass straight-through tube, the lower end of the glass straight-through tube extends into the conical flask, and the upper end of the glass straight-through tube is connected to a conical flask opening through a test tube buckle and a latex plug. The invention also discloses a method for measuring the paraffin removal rate of microorganisms and bacterial liquid, which comprises the following steps: introducing the glass straight-through pipe into a molten wax sample or high-wax-content crude oil, slowly rotating, taking out the glass straight-through pipe after the paraffin or high-wax-content crude oil completely wraps the liquid-immersed straight-through pipe, repeating the operation for 3-5 times to simulate a wax precipitation oil pipe in a shaft, and aging and weighing the treated straight-through pipe; preparing a fermentation culture medium, introducing a straight-through pipe into the fermented culture medium, carrying out shaking table culture, lightly washing a mycoderm adhered to the straight-through pipe with water, placing, and weighing after the surface is dried; and finally, the paraffin removal rate is calculated through weighing data. By accurately calculating the paraffin removal rate, the use of the paraffin remover can be effectively evaluated and optimized, so that the paraffin precipitation phenomenon of an oil well is reduced. This helps to improve the production and production efficiency of an oil well.

The utility model discloses distillation equipment for measuring free ammonia and fixed ammonia, and relates to the field of distillation measurement. Distillation equipment for measuring free ammonia and fixed ammonia comprises a water bath electric pot, a distillation flask, a communicating pipe, a condensation pipe, a conical flask and an iron stand, the distillation flask and the condensation pipe are installed on a supporting rod on the iron stand through fixing clamps, and the distillation flask is located in the water bath electric pot; in the whole measuring process of free ammonia and fixed ammonia, through the arrangement of the sealing heat preservation cover, the rapid diffusion of water vapor generated by heated water can be effectively inhibited, and heat is more intensively acted on the distillation flask, so that the heat loss is reduced, the temperature rise of liquid in the distillation flask is quicker, and the boiling is quicker, thereby accelerating the distillation speed; compared with a non-sealed heat preservation device, the single distillation time can be greatly shortened, the overall detection efficiency can be remarkably improved when free ammonia and fixed ammonia are measured, and an experimenter can complete detection of multiple samples within shorter time.

The invention discloses a method for rapidly quantifying toluene insoluble substances in asphalt, which comprises the following steps: S1, placing an asphalt sample in a conical flask of a sample dissolving system, and adding normal-temperature toluene; s2, mounting a condenser pipe on a conical flask, opening a cooling water valve, placing the conical flask on a heating table, starting stirring and heating, and refluxing and dissolving the asphalt sample for 30-60 minutes after the temperature reaches a set temperature; s3, suction filtration: pouring the dissolved asphalt sample into a sand core funnel of a suction filtration system, carrying out suction filtration while the sample is hot, washing a conical flask with toluene at 50-60 DEG C, and pouring the washed conical flask into the sand core funnel of the suction filtration system; and S4, after suction filtration is finished, drying the sand core funnel, cooling, weighing, and calculating the content of the toluene insoluble substances in the asphalt. The method solves the problems that the traditional method for quantifying the content of toluene insoluble (TI) consumes long time, is poor in operation flexibility and cannot accurately quantify the content of TI in the ultrahigh softening point asphalt.

The utility model discloses a reflux digestion instrument, relates to detection equipment technical field, including support, conical flask, condenser pipe and rotary heating device, the rotary heating device includes rotary base, heating unit and bearing frame, the rotary base is rotatingly connected with the lower end of the support around the vertical axis, the heating unit is equipped with the bearing frame, and the bearing frame is equipped with the conical flask. A plurality of heating units are arranged on the rotating base in the circumferential direction, one conical flask is placed above each heating unit, one condensation pipe is connected to each conical flask, the bearing frame is fixed to the rotating base, and the bearing frame is fixed to the rotating base. The outer side of the upper end of the bearing frame is provided with bearing cavities used for bearing the condensation pipes in the circumferential direction, and the sides, away from the center of the bearing frame, of the bearing cavities are provided with taking and placing notches. The reflux digestion instrument provided by the utility model can reduce energy loss, meets the requirements of energy conservation and emission reduction, is uniform in heating, is convenient to observe, and is convenient for taking and placing the condenser pipe.

The invention relates to the technical field of lithium ion battery positive electrode material detection, in particular to a method for measuring the content of soluble lithium in a lithium manganate finished product, which comprises the following steps of: taking 5g of lithium manganate finished product sample, putting into a 250mL beaker, adding 50mL of purified water and a magnetic stirrer, covering, stirring for 20 minutes at the rotating speed of 550r / min, standing for 2 minutes, and filtering supernate by two layers of filter paper; transferring 10 mL of filtrate to a 250 mL conical flask, adding 40 mL of purified water, firstly adding 2 drops of phenolphthalein, titrating with 0.0104 mol / L hydrochloric acid until the solution is colorless (denoted as v1), then adding 3 drops of methyl red, continuously titrating until the solution is orange, boiling for 1 min, cooling, titrating until the solution is wine red (denoted as v2), and calculating according to the formula that the content of lithium carbonate is equal to (v2-v1) * 0.0104 * 73.886 / m; the method for determining the content of soluble lithium in the lithium manganate finished product is simple and accurate to operate, rapid and efficient, can optimize the process, saves time and labor, can determine the quality of soluble lithium so as to judge the performance of a material body in advance, and ensures the production of high-quality lithium manganate.

The utility model discloses a kind of mixing device of processing liquid and sample, it is related to microbiological sample processing relevant technical field, comprising: whirlpool mixing device is installed on shaking base plate, the top of the shaking base plate is provided with recess, the top of the whirlpool mixing device is provided with the top limiting component for use in conjunction with shaking base plate. The utility model is locally limited to the top of test tube or conical flask by top limiting component, simulates the holding of hand, and replaces the holding of hand, to avoid that user directly and test tube or conical flask are contacted when mixing, reduce the uncomfortable feeling such as crispness.

The invention provides a pretreatment method for determining soil exchangeable salt composition, and relates to the technical field of soil detection, and the pretreatment method comprises the following steps: placing a weighed sample in a conical flask, adding ammonium acetate, shaking uniformly, and standing for one night; performing suction filtration by using suction filtration equipment, connecting a suction filtration flask to a suction filtration main pipeline, putting a Buchner funnel with a rubber plug on the suction filtration flask, and then putting filter paper into the Buchner funnel; pouring supernatant on the upper layer in the conical flask into a Buchner funnel with filter paper through conveying equipment; the interior of the conical flask is washed with ammonium acetate, so that all soil in the conical flask is transferred into the Buchner funnel; washing the soil sample in the Buchner funnel by using a washing bottle filled with ammonium acetate; according to the invention, the reaction of the sample is more complete, and the exchange is more thorough; the pretreatment efficiency is greatly improved, the loss of the glass rod with the rubber head is avoided, the blockage probability of an instrument is reduced, and the suction filtration speed in the early stage is higher.

The utility model relates to the technical field of gold alum raw material dissolution, and provides gold alum test raw material dissolution equipment which comprises a magnetic stirrer, and a dissolution bottle limiting assembly is arranged on one side of the magnetic stirrer; the limiting assembly comprises a guide rod fixedly connected to one side of the magnetic stirring machine, the upper end of the guide rod is fixedly connected with a threaded rod, the outer wall of the threaded rod is sleeved with a threaded sleeve in a threaded mode, the lower end of the threaded sleeve is rotationally connected with an extrusion ring, and the lower end of the extrusion ring is fixedly connected with a resistance spring; the conical flask clamping device has the advantages that conical flasks with different heights and diameters can be elastically clamped by rotating the threaded sleeve, contact pressure is guaranteed to be uniform through the design of the resistance spring, damage to a flask body due to rigid extrusion is avoided, the inclined structure on the inner side of the limiting ring is matched with the conical degree of the conical flasks, and the friction contact area is reduced by combining the strip-shaped blocks; the fixing stability is improved, meanwhile, the contact area of the limiting ring and the conical flask is reduced, follow-up disassembly is facilitated, the structure is simple, and use is convenient.

A method and apparatus for detecting aluminum carbide content includes a right-angle tube I connected to a round-bottom flask via a rubber stopper I at its inlet. One end of the rubber tube I is connected to one port of a three-way valve, and the other two ports of the three-way valve are connected to rubber tubes II and III, respectively. The other end of the rubber tube II is connected to the gas inlet of a gas chromatograph. The other end of the rubber tube III is connected to the inlet of the right-angle tube II. The outlet of the right-angle tube II, a thermometer, and the inlet of the right-angle tube III are all embedded in the rubber stopper II and installed at the mouth of a specially designed measuring cylinder. The outlet of the right-angle tube III is connected to the inlet of the right-angle tube IV via a rubber tube IV. The outlet of the right-angle tube IV, along with a glass tube, is embedded in the rubber stopper III and installed at the mouth of a conical flask. By measuring the gas volume and composition sequentially through the three-way valve, the aluminum carbide content in the sample is determined using a function model. This allows for direct observation of changes during the detection process, effectively reducing operational errors and improving the accuracy of the detection results.

The utility model relates to the technical field of traditional Chinese medicine inspection, and discloses a liquid medicine suction filtration device for traditional Chinese medicine inspection, which comprises a bottom plate, the top of the bottom plate is connected with a conical flask in a sliding manner, the top of the conical flask is connected with a liquid inlet pipe in a sliding manner, the top of the liquid inlet pipe is fixedly connected with a fixed column, and the interior of the fixed column is connected with a feed liquid tank in a sliding manner. A plurality of fixing blocks are fixedly connected to the outer side of the feed liquid tank, a sealing shell is fixedly connected to the interior of the fixing column, a sealing ring is slidably connected to the interior of the sealing shell, a limiting assembly is fixedly connected to the top of the bottom plate, and the limiting assembly comprises a plurality of limiting rods; the bottoms of the multiple limiting rods are fixedly connected to the top of the bottom plate. According to the utility model, the fixed block is clamped in the corner of the clamping groove, so that the material liquid tank can be effectively prevented from accidentally falling off, the connection is more stable and reliable, the material liquid tank is prevented from shaking or loosening in the suction filtration process, and the normal operation of suction filtration work is ensured.

The application provides a preparation method of a test sample in a content determination method of Astragalus membranaceus, which comprises the following steps: a, taking Astragalus membranaceus medicinal material powder, and sieving; b, placing the powder into a stoppered conical flask, adding 20-100 ml of 1-6 % ammonia solution-methanol solution (4 ml of ammonia solution is taken, 50 % methanol is added to 100 ml, and shaking is performed), weighing, ultrasonic extraction (250 W, 40 kHz) is performed for 10-90 min, cooling, weighing again, supplementing the lost weight with 1-6 % ammonia solution-methanol solution, shaking, filtering, and taking the filtrate, so that the test sample is obtained. The application further provides a content determination method of calycosin-7-glucoside in Astragalus membranaceus. The optimized method is stable and feasible, simple in operation, high in extraction efficiency, short in analysis time, low in detection cost, and accurate in determination, and can provide a scientific basis for improving the content determination method of calycosin-7-glucoside in Astragalus membranaceus in Chinese Pharmacopoeia.

The utility model relates to the technical field of carbon dioxide production, in particular to a carbon dioxide purity testing device, which consists of a base frame, a reaction mechanism and an observation mechanism. The reaction mechanism is arranged on the base frame and is provided with a conical flask and a spherical flask, the upper end of the conical flask is provided with a liquid inlet, and the lower end of the conical flask is communicated with the spherical flask through a connecting pipe; the observation mechanism is adjustably provided with a convex lens at the upper end of the spherical bottle and can move in the vertical and horizontal directions. During testing, a gas sample enters from the gas inlet pipe to replace air, a detection reagent is injected after the exhaust valve is closed, and the reagent reacts with carbon dioxide. The position of the convex lens is adjusted to focus a reaction area, the size of bubbles is observed through the amplification effect of the convex lens, the observation flexibility is improved through the adjustable design, and the purity of carbon dioxide can be judged more accurately.

The utility model relates to the technical field of drainage facilities, in particular to an anti-clogging drainage groove which comprises a groove body, the section of the groove body is of a conical flask structure with a small upper end and a large lower end, the left side and the right side of the lower end are of arc-shaped structures, a clamping groove is formed in an upper port of the groove body, and a drainage cover plate is clamped in the clamping groove. Flow guide inclined plates are fixedly arranged on the left side and the right side of the inner wall of the groove body, a plurality of groups of water tanks are uniformly formed in the flow guide inclined plates, a detachable anti-sludge groove is formed in the bottom of the inner wall of the groove body, the anti-sludge groove is located between the two groups of flow guide inclined plates, the width of the anti-sludge groove is smaller than the distance between the two groups of flow guide inclined plates, and filtering through holes for draining water are uniformly formed in the two side surfaces of the anti-sludge groove. Through structural design innovation, the groove body is designed to be of the conical flask structure, the middle part is used for intercepting sundries, the two side parts are used for water flow to pass through, the sundries such as leaves and garbage are effectively intercepted, the water flow is separated from the sundries, the interior of the groove is effectively prevented from being blocked, and the drainage effect is guaranteed.