31results about How to "Determine content" patented technology

The invention discloses an intelligent cup capable of detecting liquid substance based on near infrared spectrum, comprising a cup body, a cup lid, an liner, an MCU, a near infrared spectrum transmitter, a near infrared spectrum receiver, a display screen and a peripheral circuit, wherein the MCU and the peripheral circuit are both arranged at the bottom of the cup body, two transparent windows which are symmetrical along the axis are arranged at the lower end of the liner, the near infrared spectrum transmitter and the near infrared spectrum receiver are both arranged between the liner and the outer wall of the cup body and respectively positioned at the two transparent windows, the display screen is arranged on the outer wall of the cup body, and the signal ends of the near infrared spectrum transmitter, the near infrared spectrum receiver, the display screen and the peripheral circuit are all connected with the signal end of the MCU. The intelligent cup samples and detects drinking water in the cup by the near infrared spectrum detection unit, and determines the liquid substance or content, particularly the content of heavy metal and other harmful substances by analyzing sampled data of the substance spectrum diagram and being compared with the known substance spectrum characteristics.

The invention discloses a preparation and use method of a ratio fluorescent probe for visual distinguishing detection. The preparation method specifically comprises the following steps: step 1, preparation of silicon-based carbon quantum dots; step 2, preparation of the nano mesoporous molecularly imprinted material coated with the silicon-based carbon quantum dots; step 3, performing surface modification on the nano mesoporous molecularly imprinted material; and step 4, preparing the ratio fluorescent probe based on the nano mesoporous molecularly imprinted material. The use method comprises the following steps: (1) diluting tetracycline or oxytetracycline into solutions with different gradient concentrations; (2) dispersing the prepared ratiometric fluorescent probe based on the nano mesoporous molecularly imprinted material in ultrapure water; (3) adding a Tris-HCl buffer solution with the pH value of 8 into a quartz cuvette, uniformly mixing the Tris-HCl buffer solution and the solution, and respectively dropwise adding the tetracycline solution or the oxytetracycline solution in the step (1) for fluorescence determination; the main substrate is the silicon dioxide molecular imprinting layer with the mesoporous structure, the method is reliable, mass production can be carried out, and the probe is widely applied to the society.

The invention relates to a method for detecting EDTA (ethylene diamine tetraacetic acid) in a laundry detergent. The method comprises steps as follows: (1) preparing a potassium bicarbonate aqueous solution; (2) adding the to-be-detected laundry detergent to the potassium bicarbonate aqueous solution, stirring the solution at the temperature of 45-50 DEG C for 10-20 min, filtering the solution while the solution is hot, and naturally cooling the solution to the room temperature to obtain a pretreated solution; (3) adding an iron liquid to the pretreated solution, performing oscillating extraction and then centrifugation, and removing an aqueous phase to obtain an ion liquid phase; (4) adding trivalent iron salt to the ion liquid phase, after full and even mixing, performing chromatography separation with a gel column chromatography Superose 12 column, performing washing with n-hexane firstly, then performing gradient elution with a petroleum ether-normal propyl alcohol mixed solvent serving as an eluent, and collecting the eluent; (5) evaporation the solvent of the eluent until the solvent is almost dry, and performing dissolution, volume determination and filtration with an organic membrane to obtain a detection sample; (6) performing liquid chromatography separation on the to-be-detected sample to determine the content. The method is excellent in EDTA quantitation accuracy, and a new detection means is provided for control on the content of the EDTA in the laundry detergent.

The invention discloses a method for detecting carbamazepine. The method comprises the following steps of: contacting a sample to be detected and a carbamazepine specificity antibody; and determining the content of the carbamazepine in the sample according to combination of a substance in the sample to be detected and the antibody, wherein the carbamazepine specificity antibody is obtained from a carbamazepine immunogen immune animal. The detection method is high in specificity; and by the method, the carbamazepine and the content of the carbamazepine in the sample to be detected can be determined accurately.

The invention discloses a standard colorimetric method for measuring the content of a carbonyl compound in industrial methanol, belonging to the field of industrial methanol. The standard colorimetric method comprises the following steps of: firstly, preparing a series of standard solutions with different contents of the carbonyl compound, reacting with 2,4-dinitrophenylhydrazine and potassium hydroxide under a certain condition, and observing that the color gradually changes from faint yellow to deep red brown with the gradual increase of the content of the carbonyl compound. According to information such as the colors of the standard solutions, volume part mass number of the content of the carbonyl compound, and methanol grade, a standard colorimetric card. A sample completely reacts under the same condition, compared with the standard colorimetric card, a closest color is found, and the information such as content of the carbonyl compound and the methanol sample grade is directly read. The quantitative calculation of the content of the carbonyl compound can be realized. The standard colorimetric method has the characteristics of intuition, rapidness, convenience, low requirements for detection devices, apparatuses and occasions, and the like.

It is intended to provide a mixture for preventing the diffusion of a contaminating component which has a stable and excellent purification ability against a contaminating component contained in contaminated soil compared with the existing techniques for preventing the diffusion of a contaminating component; and a method of preventing the diffusion of a contaminating component. A mixture for preventing the diffusion of a contaminating component comprising an adsorbent which adsorbs the contaminating component contained in contaminated soil and a diluting agent which is blended with the above-described adsorbent at a definite ratio to control the coefficient of water permeability and the thickness, characterized in that the mixture shows a space velocity of water containing the contaminating component as described above of from 1 to 60 (l / hr).

The invention discloses a method for determining the content of Ti in a TiO2 photocatalyst and belongs to the field of chemical testing. The method comprises the following steps: adding 10-100mg of carrier catalyst into a polytetrafluoroethylene microwave digestion tube, adding 1-10ml of 98% concentrated sulfuric acid and 1-10ml of 30% hydrogen peroxide, and performing heating digestion reaction in a microwave digester, wherein the reaction temperature is controlled within 140-200 DEG C, and the reaction time is controlled within 25-55min; after the reaction is finished, a digestion solution is obtained, filtering the digestion solution, making up to the volume to 50ml, and determining the content of the Ti in a liquid supernatant by virtue of ICP-OES. The carrier TiO2 catalyst is acidized and subjected to microwave digestion pretreatment, TiO2 is converted into the Ti in a soluble ionic state, and the quick, simple and convenient method is provided for the determination of the content of the Ti in the TiO2 photocatalyst. The method is suitable for determining the content of the Ti in a TiO2 nano-sheet colloid, a TiO2 nano-tube, a thin TiO2 film and catalysts in other forms, is suitable for being used for determining the content of the Ti in the TiO2 photocatalyst after repeated reaction, and is wide in application range.

The invention discloses an electric arc atomic emission element spectrometer and a control method thereof and belongs to the field of oil fluid element spectrum analysis.The electric arc atomic emission element spectrometer comprises a disc electrode and a rod electrode, the disc electrode is arranged on a sample container, and the rod electrode is hung above the disc electrode and is opposite to the disc electrode.The electric arc atomic emission element spectrometer further comprises a disc electrode rotating motor, an electric arc generator, a spectrometer body, a controller and a data collection and communication module.The electric arc atomic emission element spectrometer can detect lubricating oil / grease used by mechanical equipment and can accurately and effectively know current wear conditions, pollution conditions and additive loss conditions of used lubricating oil / grease of the mechanical equipment, so that convenience is brought to timely finding early-stage faults, preventing the equipment from being seriously damaged and scientifically formulating oil / grease changing period, service life of the equipment is prolonged greatly, energy conservation and loss reduction are realized, and great economic benefit is brought to enterprises.

The invention discloses a method for detecting the content of aluminium and aluminium alloy oxide inclusions, comprising the following steps: (1) first, cutting a sample material of aluminum sheets, washing the sample material with absolute ethyl alcohol and absolute methanol, and drying; (2) weighing 1+ / - 0.0001 g sample material, putting the sample material in a beaker containing 60-100 ml of methanol, adding 2-5 ml bromine in the beaker to react for 30-60 min at a temperature of 20-50 DEG C; (3) then adding 1-3 ml of bromine to react for 15-50 min at a temperature of 20-50 DEG C, and then adding 1-3 ml of bromine again to react for 15-50 min at a temperature of 20-50 DEG C, then reacting at a temperature of 30-60 DEG C until the sample material dissolves completely; (4) filtering the solution with filter paper, removing the filtrate, cleaning the filter paper with methanol until no bromine remains; (5) putting the filter paper having precipitations in a crucible, ashing from a low temperature, heating up to 600-900 DEG C and keeping warm for 20-60 min and then taking out, cooling, adding 1-3 g of alkali, and fusing at a temperature of 550-800 DEG C, taking out and adding hot water in the beaker, adding hydrochloric acid while shaking the beaker, pouring the liquid of the beaker in a 100 ml volumetric flask, and bringing to volume by water; and (6) respectively taking 10 ml of the solution out from the 100 ml volumetric flask, bringing to volume by water, then comparing by using a standard curve obtained by atomic absorption, and then determining the content of the aluminium and aluminium alloy oxide inclusions.

The invention discloses a method for multistep quantitatively detecting serum albumin and metaglobulin in plasma, belonging to the field of bioluminescence marking. The method comprises the following steps: adding fluorescent reagents in different serum albumin concentrations into the fluorescent reagent at several times and measuring DP-TPPNa fluorescence intensity after dropwise adding each time; acquiring the optimal concentration and the detection scope of DP-TPPNa for serum albumin according to a measuring result; dropwise adding the serum albumin and metaglobulin in different mass ratios into the fluorescent reagent at several times and measuring DP-TPPNa fluorescence intensity after dropwise adding each time; drawing a change curve of change rate of DP-TPPNa fluorescence intensity following the concentration of serum albumin according to the measuring result; selecting a standard curve according to the change curve; adding a plasma sample into the fluorescent reagent, measuring the DP-TPPNa fluorescence intensity, substituting into a linear equation of the standard curve and calculating the concentration of the serum albumin and metaglobulin.

This invention discloses one portable double resin film electro-chemical sensor, which comprises level constant module, central control module and test electrode, wherein, the constant level module is composed of high input resistance computation amplifier as center error amplification device; reference electrode and given electrode are comparing to be sent to band filter and work frequency limit wave device for process to remove noise and interference through power amplifier to output test electrode; central control module also comprises data collection unit, progress switch unit, input display unit and single machine.

The embodiment of the invention discloses a method for determining active ingredients with myocardial protection and anti-inflammatory action in traditional Chinese medicine. The method comprises the steps of (1) obtaining each ingredient of the target traditional Chinese medicine through preparation of liquid chromatogram; (2) determining the active ingredient with myocardial protection action through myocardial cell antioxidant model experiment; (3) determining the active ingredient with anti-inflammatory action through macrophage anti-inflammatory model experiment. According to the determined traditional Chinese medicine active ingredients with myocardial protection and anti-inflammatory action, content of the traditional Chinese medicine active ingredients is easy to determine, then, quality control on the target traditional Chinese medicine can be realized, and clinical curative effect of the target traditional Chinese medicine is guaranteed.

The invention discloses synthesis of a fluorescent hydrogel sensor based on ionic liquid and application of the fluorescent hydrogel sensor in detection of paranitroaniline, hydroxyethyl methylacrylate, N, N '-methylene bisacrylamide, a fluorescent ionic liquid monomer and an initiator azodiisobutyronitrile are dissolved in dimethyl sulfoxide to prepare a mixed solution; the mixed solution is adsorbed onto a substrate material, in-situ cross-linking polymerization is performed under a heating condition, washed and dried to synthesize the fluorescent hydrogel sensor. The material can be used as a fluorescent sensor for rapidly detecting paranitroaniline, has the advantages of high sensitivity, short detection time, good selectivity and the like, and can be applied to detection of paranitroaniline in environmental living water samples.

The present invention relates to the technical field of vegetable pesticide detection, and discloses a method for detecting pesticide residues in vegetables, including the following steps: S1: extracting samples; S2: detecting the samples, wherein the processed and classified samples are sent into different chromatographic analysis instruments respectively for detection, so as to more comprehensively detect the residual components and content of pesticides in the vegetables; S3: going through a gas chromatograph, so as to analyze the content of some gasified pesticide residues of the pesticideresidues in the vegetables, thus enabling the content of the pesticide residues in the vegetables to be detected quickly, effectively and sensitively; S8: going through a high performance liquid chromatograph that is used to analyze high boiling point and non-volatile, heat-labile and large molecular weight organic compounds, so as to perform chromatographic analysis in a manner of high pressuresolvent delivery; S3: introducing the data into an analyzer, comparing each of detected chromatograms, determining the chromatograms of the pesticide residues in the vegetables by using a mathematicalinduction method in combination with previous data references and determining the content of the pesticide residues of leaves and stems of the vegetables.

The invention provides avian H9 subtype avian influenza virus antibody colloidal gold test paper and test card. The avian H9 subtype avian influenza virus antibody colloidal gold test paper and test card can detect the immune level of various birds and are wide in application range, high in specificity, high in sensitivity, easy to operate and short in consumed time. The test paper comprises a sample pad, a gold-labeled pad and a nitrocellulose membrane which are sequentially connected, wherein the gold-labeled pad is wrapped with a colloidal gold label of a monoclonal antibody, namely anti-mouse IgY Fc CH3-CH4; and a detection line close to one end of the gold-labeled pad and a quality control line away from one end of the gold-labeled pad are arranged on the nitrocellulose membrane, thedetection line is wrapped with an AIV-HA19 recombinant protein, the quality control line is wrapped with a second antibody, and the DNA sequence for encoding the AIV-HA19 recombinant protein is shownas SEQ ID NO.1.

The invention provides an optimized DNA sequence, a recombinant plasmid, a strain, a recombinant protein, mycoplasma gallisepticum antibody colloidal gold detection test paper containing the recombinant protein and a detection card based on mycoplasma gallisepticum VlhA1.2 protein, wherein the test paper can be used for quickly detecting diagnosis of poultry after mycoplasma gallisepticum infection and antibody level detection after immunization. The optimized DNA sequence is shown as SEQ ID NO.1. The optimized DNA sequence is combined with a pGEX-KG vector to obtain the recombinant plasmid pGEX-KG-VlhA1.2, and transforming and expressing is carried out to obtain the MG-VlhA1.2 recombinant protein. The test paper comprises a gold-labeled pad and a nitrocellulose membrane which are sequentially connected, wherein the gold-labeled pad is coated with a colloidal gold label of a monoclonal antibody mouse anti-IgY Fc CH3-CH4; and one end of the nitrocellulose membrane, which is close to thegold-labeled pad, is a detection line coated with MG-VlhA1.2 recombinant protein.

The present invention relates to a quantitative analysis method for a monomer of a color filter (CF) photoresist (PR) binder for a thin film transistor-liquid crystal display (TFT-LCD), and can perform quantitative analysis on a monomer of a CF PR binder for a RFT-LCD by using a Py-GC / MS used for qualitative analysis.

The invention relates to a reagent for rapidly detecting paraquat, and a preparation method and application thereof. The reagent for rapidly detecting the paraquat is prepared by mixing two raw materials of sodium hydrosulfite and soluble carbonate. Compared with an existing detection reagent, the reagent is more convenient to use and higher in use safety. According to the method for rapidly detecting the paraquat, the color can be observed at the sample usage amount of 100-300 mg per 0.3 mL, the effect can be more obvious at the sample usage amount of 100-300 mg per 1 mL, and compared with aconventional test method, the sample usage amount is greatly reduced, the practical application value is wider; through the adoption of the detection method, the test can be completed within several seconds, and the test efficiency is higher under a condition of multiple test samples; and the test proves that 100-300 mg per 1 mL of distilled water is added into the reagent, slight vibration is carried out, a cotton swab is used for dipping a small amount of liquid, and then suspicious spots are wiped, so that the paraquat with the content of more than 0.1 microgram can be detected through thecolor change of the cotton swab, and thus the reagent provided by the invention has a wider test range.

The invention discloses a standard colorimetric method for carbonyl compound content in industrial methanol, and belongs to the field of industrial methanol. The method comprises the following steps:preparing a series of standard solutions with different carbonyl compound contents, reacting the standard solutions with 2, 4dinitrophenylhydrazine and potassium hydroxide in sequence under certain conditions, and observing to find that the color is gradually changed from faint yellow to dark red brown along with the gradual increase of the carbonyl compound contents; preparing a standard colorimetric card according to the color of the standard solution, the volume part mass number of the carbonyl compound content, the methanol grade and other information; after the sample is completely reacted under the same condition, comparing the sample with a standard colorimetric card, finding out the closest color, and directly reading out information such as the content of the carbonyl compound andthe grade of a methanol sample. Quantitative calculation of the content of the carbonyl compound can be achieved. The determination method has the characteristics of intuition, rapidness, simplicity,convenience, low requirements on detection equipment, instruments, places and the like.

The present application discloses a detection reagent combination, a kit and a detection method for rubidium or cesium ions. The detection reagent combination includes component (a): a solution of gold nanoparticles modified by a modifier, or used to form the modified gold nanoparticle solution. A reagent component of an agent-modified gold nanoparticle solution, wherein the modifier is a thiol compound containing a benzene ring; Component (b): a ligand solution, or a reagent component for forming the ligand solution; the ligand The body solution is selected from at least one of dibenzo-21-crown-7 solution, dialkyldibenzo-21-crown-7 solution, and benzo-21-crown-7 solution. The detection method for rubidium or cesium ions provided in this application only uses naked eye colorimetry, that is, both can reach a minimum of 1×10 ‑5 The lower detection limit of mol / L; the method of the invention combined with the instrumental analysis means can also detect lower concentrations of rubidium or cesium ions, and has very high sensitivity.

The invention discloses a culture medium production process which comprises the following steps: premixing, namely primarily mixing multiple materials for producing a culture medium; carrying out grinding, namely grinding the primarily mixed materials; carrying out after-mixing, namely premixing the grinded materials for another time; carrying out spectrum detection, namely detecting the materialsafter the after-mixing step by using spectrum detection equipment, namely radiating materials in a same range in the culture medium with detection light of different wavelengths when detection is carried out, and respectively confirming contents of different materials within the radiation range. By adopting the culture medium production process disclosed by the invention, key quality property accuracy of the culture medium can be ensured.

The invention discloses a method for preparing and using a ratiometric fluorescent probe for visual discrimination detection. The preparation method specifically includes the following steps: Step 1, preparation of silicon-based carbon quantum dots; Step 2, nano-mesoporous coating of silicon-based carbon quantum dots Preparation of molecularly imprinted materials; Step3, surface modification of nano-mesoporous molecularly imprinted materials; Step4, preparation of ratiometric fluorescent probes based on nano-mesoporous molecularly imprinted materials; the method of use includes: (1) Dilute tetracycline or oxytetracycline Solutions with different gradient concentrations; (2) The prepared ratio fluorescent probe based on nano-mesoporous molecularly imprinted materials was dispersed in ultrapure water, (3) Tris-HCl with pH=8 was added to the quartz cuvette After the buffer solution and the solution are mixed, the tetracycline solution or the oxytetracycline solution in the step (1) are respectively added dropwise for fluorescence measurement; the main matrix of the present invention is a silicon dioxide molecularly imprinted layer with a mesoporous structure, and the method is reliable and can mass-produced and widely used in society.

The invention discloses a high-efficiency placer sample elutriation method. The method comprises the following steps of (1) carrying out soak cleaning treatment is carried out on a raw ore sample of atitanium-copper placer; (2) carrying out screening and impurity removal treatment on a product subjected to soak cleaning by using sieves with different particle size; and (3) carrying out crushing until a target mineral is obtained. The method has the advantages that the target mineral in the raw ore sample of the titanium-copper placer can be effectively obtained by elutriation, and the mine production yield and the comprehensive recovery rate can be remarkably increased; the detection of the target mineral content in the raw ore sample of the titanium-copper placer can be accurately determined on the basis of the weight of the obtained target mineral, so that raw ore monitoring is facilitated, and in addition, the method is simple in process, safe and convenient to operate, high in practicability and easy to popularize.

According to the method for tracing and analyzing the drug content in the health care product through the auxiliary agent, the drug in the health care product can be subjected to photolysis reaction and generate free radicals, the free radicals generated in the photolysis process of the drug are captured through the drug auxiliary agent to generate a volatile first component, then the first component with the low boiling point is separated out through the gas-liquid separation technology, and the content of the drug in the health care product is analyzed through the gas-liquid separation technology. And carrying out derivatization reaction on the first component and a derivatization reagent, and determining the content of the medicines in the health care product by adopting surface enhanced Raman spectroscopy. Compared with the prior art, the method for tracing and analyzing the drug content in the health-care product by the aid of the auxiliary agent has the advantages that the time required by sample pretreatment is shortened, the detection and analysis process of the drug content in the health-care product is greatly simplified, the steps are simple, and the sensitivity is high.

The invention relates to a method for operating a water-conducting household appliance having a drum (3), a control device (18) and a spectrometer (21), the drum receiving objects (22, 34) to be treated, The drum has at least one circumference with at least one radiation channel (30, 35), the spectrometer comprises at least one radiation source (5, 27), at least one radiation detector (7, 28) and a microcomputer (6), wherein , the microcomputer (6) and the control device (18) are configured to exchange information with each other, so that data can be exchanged between the spectrometer (21) and the control device (18), it is characterized in that the method comprises the following steps: (a) The drum (3) is rotated at a predetermined rotational speed Dz, wherein the frequency f based on the number of revolution cycles of the radiation channels (30, 35) per unit time is defined as the ratio of the rotational speed Dz to the radiation channels (30, 35) The product of the quantities; (b) continuously emitted by at least one radiation source (5, 27) of the spectrometer (21) in the wavelength range λ 1 ‑λ 2 the radiation (31) in passes through at least one radiation channel (30, 35) of the rotating drum (3), so that a periodically interrupted radiation (31) with frequency f is produced in the drum (3), and the objects (22, 34) in the rotating drum (3) are loaded with radiation (31) periodically interrupted at a frequency f, and at least one radiation detector (7, 28) is arranged such that the objects (22, 28) 34) The reflected radiation (32) is recorded directly as a measurement signal without passing through the radiation channel (30, 35) and thus not being interrupted by the radiation channel (30, 35) at frequency f, and is generated by the control device (18) only in relation to A periodic function with a period length 1 / f - in particular a sinusoidal or rectangular function - associated with the household appliance (1) as a reference signal; (c) the measurement signal and the reference signal are transmitted to the microcomputer (6), with the aid of the stored in The analysis routine in the microcomputer (6) analyzes the measurement signal and compares it with the reference signal, and transmits the analyzed measurement signal to the control device (18); (d) via the control device (18) An operating program is selected and / or adapted with respect to the evaluated measurement signals, wherein steps (b) to (d) are carried out one or more times. Furthermore, the invention relates to a domestic appliance which is suitable for carrying out the method.

The invention relates to a method for operating a water-conducting domestic appliance comprising a drum 3 for receiving objects 22, 34 to be treated, said drum having at least one perimeter with at least one radiation passage 30, 35; a controller 18; and a spectrometer 21, which comprises at least one radiation source 5, 27, at least one radiation detector 7, 28, and a microcomputer 6. The microcomputer 6 and the controller 18 are designed to exchange information between each other such that data can be exchanged between the spectrometer 21 and the controller 18. The invention is characterizedby the following steps: (a) rotating the drum 3 at a specified rotational speed Dz, wherein a frequency f, which is based on the number of rotation cycles of radiation passages 30, 35 per unit of time, is defined as the product of the rotational speed Dz multiplied by the number of radiation passages 30, 35; (b) continuously ascertaining radiation 31 from the at least one radiation source 5, 27 of the spectrometer 21 in a wavelength range lambda1 to lambda2 through the at least one radiation passage 30, 35 of the rotating drum 3 such that a radiation 3 which is periodically interrupted at thefrequency f is produced in the drum interior and the objects 22, 34 in the rotating drum 3 are supplied with the radiation 31 periodically interrupted at the frequency f, wherein the at least one radiation detector 7, 28 is arranged such that the radiation 32 reflected by the objects 22, 34 is registered directly as a measurement signal without passing through the radiation passage 30, 35, and thus without being interrupted by the radiation passage 30, 35 at the frequency f, and a periodic function, which depends solely on the domestic appliance 1, with the period length 1 / f, in particular asine or rectangular function, is generated as a reference signal by the controller 18; (c) transmitting the measurement signal and the reference signal to the microcomputer 6, analyzing the measurement signal and the comparison thereof with the reference signal using an analysis routine stored in the microcomputer 6, and transmitting the analyzed measurement signal to the controller 18; and (d) selecting and / or adapting an operating program by means of the controller 18 with respect to the analyzed measurement signal, wherein steps (b) to (d) are carried out once or multiple times. The invention further relates to a domestic appliance which is suitable for carrying out the method.

The invention discloses an automatic packaging machine, which comprises a workbench (1), a hopper (2), a conveying mechanism, a roll film folding mechanism, a packaging mechanism and a conveyor belt (8), and also comprises an oil return system, wherein the oil return system comprises an oil pump (9) and an oil return pipe (91); a stirring rod 23 and a conveying rod 22 are arranged inside the hopper 2; the stirring rod 23 is located at the outer side of the conveying rod 22; helical sheets are arranged on the conveying rod 22; a first cold air hole is formed in a longitudinal sealing plate; a second cold air hole is formed in a horizontal sealing plate; and the first cold air hole and the second cold air hole are connected with a fan by an air cooling pipe (7). The automatic packaging machine also comprises a high-temperature cleaning mechanism (81) and a drying mechanism (82). The automatic packaging machine has the advantages that sterilization can be realized; seams are prevented from appearing during packaging material bags; a plurality of seasonings can be packaged; and the oil reduction of pickled mustard-green can be effectively reduced.

The invention relates to a method for detecting EDTA (ethylene diamine tetraacetic acid) in a laundry detergent. The method comprises steps as follows: (1) preparing a potassium bicarbonate aqueous solution; (2) adding the to-be-detected laundry detergent to the potassium bicarbonate aqueous solution, stirring the solution at the temperature of 45-50 DEG C for 10-20 min, filtering the solution while the solution is hot, and naturally cooling the solution to the room temperature to obtain a pretreated solution; (3) adding an iron liquid to the pretreated solution, performing oscillating extraction and then centrifugation, and removing an aqueous phase to obtain an ion liquid phase; (4) adding trivalent iron salt to the ion liquid phase, after full and even mixing, performing chromatography separation with a gel column chromatography Superose 12 column, performing washing with n-hexane firstly, then performing gradient elution with a petroleum ether-normal propyl alcohol mixed solvent serving as an eluent, and collecting the eluent; (5) evaporation the solvent of the eluent until the solvent is almost dry, and performing dissolution, volume determination and filtration with an organic membrane to obtain a detection sample; (6) performing liquid chromatography separation on the to-be-detected sample to determine the content. The method is excellent in EDTA quantitation accuracy, and a new detection means is provided for control on the content of the EDTA in the laundry detergent.