31results about How to "Meet quantitative requirements" patented technology

The invention discloses a method for determining nitrate and nitrite ions in cigarette tipping paper. The method consists of: cutting a tipping paper sample and weighing it, dipping sample fragments in deionized water, conducting water bath extraction, then carrying out static cooling to room temperature; taking the supernatant, and passing it through a water-based filter membrane syringe needle filter and a C18 column, thus obtaining a sample solution; weighing a nitrate ion standard solution and a nitrite ion standard solution, adding deionized water to a constant volume, and then implementing dilution with deionized water so as to obtain standard working solutions; then implementing ion chromatograph (IC) analysis on the standard working solutions and the sample solution to measure the peak areas of nitrate and nitrite ions in the sample, and substituting the peak areas into standard curves so as to calculate the content of nitrate and nitrite ions in the sample. The quality can be determined by standard substance retention time, and the quantity can be determined by the peak areas. The method can accurately determine the content of nitrate and nitrite ions in a cigarette tipping paper sample, has the advantages of rapidity, reliability, simplicity and practicability, and fills in the blank of determination of nitrate and nitrite ions in cigarette tipping paper at present.

The invention relates to a method of detecting ammonia cigarette filters intercepted by using ion chromatography conductivity device. The steps of the method: taking down the filter after the cigarette is burned off, shearing the filter into shivers vertically by scissors, putting the shivers into a receiving flask; adding 25-35mmol / L sulphuric acid solution into the receiving flask, plugging the tampon, filtering after vibration; analysising the filtrate by IC chromatograph, adopting CS12A cation exchange column; adopting the flow rate of elutriant 0.20-0.28mL / min, making the elutriant up of deionzied water and 35-45 mmol / L sulphuric acid solution, eluting by the gradient elutriant ; applying the temperature of 28-32 DEG C for the column and the detection cell. Sample size: 10-25 MuL, current flow: 15-32mA. The determination is made by retention time of standard substance while quantitation by peak area. The invention has the advantages of accurately and effectively detecting ammonia cigarette filters intercepted rapidly and reliability, convenient and easy handling. By adopting the gradient elute, the interference of various ions can be eliminated especially sodium ion; the invention solves the problem of rapid detection of ammonia cigarette filters intercepted and fills in the technology blank of detecting ammonia cigarette filters intercepted.

The invention discloses a method using ion chromatography for determination of ammonia content in electronic cigarette smoke fluid. According to the method, an electronic cigarette smoke fluid sample is extracted by an acid solution; if the sample is dissolved completely in the extraction liquid, supernatant liquid is taken for filtration with a 0.45 mum aqueous microporous membrane; if the sample is in suspension state, the extraction liquid is placed in a centrifuge tube for centrifuging for 5min in the 10000r / min speed, and a clear liquid is taken for filtration with a 0.45 mum aqueous microporous membrane. After the pretreatment, the extraction liquid is introduced into an ion chromatograph for determination by external standard method quantitative analysis. The method is fast in operation, simple and easy. Results show that: the ammonia is in good linear relationship in linear range (R2 > = 0.999), the detection limit is 0.0350 mug / g, the limit of quantification is 0.116 mug / g, the three adding standard level recovery rate is in the range of 93.21%-106.47%, and the method has high sensitivity and good repeatability and recovery rate.

The invention discloses an automatic quality detection cloud platform. The cloud platform receives a product image. The product image is sent to a plurality of terminals. The cloud platform and the multiple terminals judge the product quality. The cloud platform synthesizes all judgment results, and finally whether the product quality is qualified or not is determined. According to the automatic quality detection cloud platform, the cloud computing and product quality detection are combined, the automatic degree of the product quality detection is improved, the detection cost is lowered, and the detection field is enlarged.

The invention relates to an ion chromatographic measurement method for the ammonia content in flue gas of an electronic cigarette. The method is used for measuring the ammonia content in the flue gas of the electronic cigarette. The method comprises the following steps: (1) preparing a sample solution to be measured; (2) preparing a standard working solution; (3) performing ion chromatographic analysis; (4) drawing a standard curve, and calculating a result; (5) calculating the ammonia content of the flue gas of the electronic cigarette according to a formula. According to the method, an analysis method for measuring the ammonia content of the flue gas of the electronic cigarette is established for the first time, is rapidly operated, and is simple and easy, a method for rapidly measuring the ammonia content of the flue gas of the electronic cigarette is established, and a blank in a method for measuring ammonia in the flue gas of the electronic cigarette is filled.

The present invention discloses a method for simultaneously measuring acetic acid vinyl ester and 6 benzene series substances in water-based adhesive. The method comprises: dispersing samples by using N-N dimethylformamide, quantifying by using double internal standard methods and simultaneously measuring 7 compounds in cigarette water-based adhesive by using a headspace-gas chromatography-mass spectrometer during one sample injection; under adopted chromatographic conditions, chromatographic peaks of benzene, toluene, ethylbenzene, orthoxylen, m-xylene / p-xylene (m-xylene and p-xylene are not separated due to problems of a chromatographic column, but the calculation results are not influenced), and acetic acid vinyl ester target substance as well as two internal standard substances, namely isobutanol and 2-hexanone, are separated well. Results show that the regression equation correlation coefficient of each component reaches 0.999 or more, the quantitative determination limit of the benzene series substances is 0.01-0.02mg / kg, the quantitative determination limit of acetic acid vinyl ester is 0.10mg / kg, the mean relative standard deviation is 1.15%-3.75%, the adding standard recovery is 88.09%-95.44%; the method is fast, accurate, good in repeatability, high in recovery rate, good in practicability, and the like.

The invention discloses a method for simultaneous detection of 13 benzene compounds and phthalic acid ester compounds in a water-borne adhesive. The method comprises the steps of oscillating to disperse samples by adopting ultrapure water, then extracting through cyclohexane and filtering to obtain a sample solution, and simultaneously detecting 13 compounds in the water-based adhesive for cigarettes in one-time sample feeding by utilizing a gas chromatograph-mass spectrometer. The chromatographic peak has good separation effect, and the result shows that the correlation coefficients of the regression equation of components all reach 0.997 or above, the quantitative detection limits of six benzene compounds are 0.04-0.07 microg / g, and the quantitative detection limits of seven phthalic acid ester compounds are 0.5-4.2 microg / g. The method has the advantages of accuracy, rapidness, high sensitivity, good repeatability, high recovery rate and the like, and conforms to the quantitative requirement.

The invention discloses a wear test device of an excavator bucket, belongs to the field of mechanical manufacture, and is suitable for a wear test of the excavator bucket 5. The bucket 5 comprises a front hinge point hole and a rear hinge point hole. The wear test device of the excavator bucket comprises a test bracket 1, a driving mechanism, a material tank 2 and a material. The front hinge point hole of the bucket 5 is hinged with the test bracket 1, and the rear hinge point hole of the bucket 5 is connected with the driving mechanism. The driving mechanism drives the bucket 5 to rotate around the front hinge point hole, so as to simulate a digging process of the bucket 5. The material tank 2 is arranged below the bucket 5, and the material is placed in the material tank 2 and located in a bucket 5 rotating region, namely a digging region. The wear test device takes the friction and wear life of the bucket as a main test purpose, also gives consideration on the structure fatigue life, performs a bench test, can accurately collect bucket wear information, facilitates analysis and improvement, and besides, also greatly saves the time and cost required by whole-machine tests and customer tests.

The invention relates to a positive-phase liquid chromatogram-tandem mass spectrum detection method for nicotine optical isomers in tobacco and tobacco products. The positive-phase liquid chromatogram-tandem mass spectrum detection method is characterized in that nicotine in tobacco leaves is extracted by a NaOH (sodium hydroxide) solution and n-hexane, the nicotine optical isomers are separated by a chiral chromatographic column, a post-column high pressure liquid output pump is used for introducing isopropyl alcohol and separating flow, and the tandem mass spectrum is used for analyzing, so as to complete the separation and sensitive detection of S-(-)-nicotine and R-(+)-nicotine in the tobacco and tobacco products. The positive-phase liquid chromatogram-tandem mass spectrum detection method has the characteristics and beneficial effects that the post-column high pressure liquid output pump is used for introducing isopropyl alcohol and separating flow, so that the amount of non-polarity solvent entering mass spectrum is reduced, the amount of isopropyl alcohol of polarity solvent is compensated, the ionizing efficiency is improved, the requirement of liquid chromatogram-tandem mass spectrum analysis is met, and the analysis sensitivity is improved; compared with the prior art, the chromatographic resolution of the two types of nicotine optical isomers is high, and the difference of retention times is 1min; the analysis time is short, and is only 17min.

The invention discloses a robot remote control method based on a cloud platform. An intelligent detecting cloud platform is used for detecting a product captured by an image of a detecting robot; every kind of products has corresponding intelligent detecting cloud platforms; according to the detected results, the intelligent detecting cloud platform notices the detecting robot to grip unqualified products. The robot remote control method uses the cloud platform to remotely identify product quality and controls the detecting robot to grip the unqualified products, so that the product quality detecting efficiency and the automatic capacity are improved.

The invention relates to the technical field of medical pharmacy, and discloses a capsule printing machine provided with a counting-quantifying device. The capsule printing machine provided with the counting-quantifying device comprises a capsule printing machine body, wherein a counting touch screen is fixedly installed at the right side of the front surface of the capsule printing machine body;a storage bin is fixedly installed on the upper surface of the capsule printing machine body; and a discharge port is formed in the right sidewall of the capsule printing machine body. According to the capsule printing machine provided with the counting-quantifying device, one-by-one physical counting for capsules running at a speed of 100000 capsules per hour is automatically completed while thesurfaces of the capsules are printed, material flow can be cut off when a preset quantity is reached, so that the requirement of the subsequent process management in the aspect of quantity is met, anda unique material flow cut-off device ensures the printing quality of the capsules during movement; and according to the capsule printing machine provided with the counting-quantifying device, a behindhand capsule weight conversion counting manner is changed into a one-by-one physical capsule counting manner, so that the operation efficiency, and meanwhile, the working accuracy of the equipment is increased, and the labor intensity of working personnel is reduced.

The invention discloses a synchronous analysis method of SO4<2->, SO3<2->, S2O6<2-> and S2O8<2-> in a pyrolusite leaching solution, which mainly comprises the steps of: separating and removing part of SO4<2-> from a sample pyrolusite leaching solution with a BaCl2 solution with the mass concentration of 5 percent to 10 percent through a titration precipitation method and then filtering; calculating the content of SO4<2-> in filtration residue; analyzing filtrate by an IC chromatographic instrument; adopting a AS14 anion analytical column which is subjected to gradient elution by leacheate prepared by ionized water and NaOH solution with the mass concentration of 15 to 50 mol / L; measuring the standard substance retention time and peak area of SO4<2->, SO3<2->, S2O6<2-> and S2O8<2-> by the IC chromatographic instrument; and comparing the retention time and peak area with the measured result of the filtrate so as to obtain the content of each sulphur-containing anion in the filtrate, and then adding with the amount of SO4<2-> obtained by calculation of the filtration residue to obtain the content of each sulphur-containing anion in the sample pyrolusite leaching solution. The adoption of the method for analyzing the content of sulphur-containing anion is characterized by fast speed, high accuracy, small error, good reproducibility and the like.

The present invention discloses a method for simultaneously measuring acetic acid vinyl ester and 6 benzene series substances in water-based adhesive. The method comprises: dispersing samples by using N-N dimethylformamide, quantifying by using double internal standard methods and simultaneously measuring 7 compounds in cigarette water-based adhesive by using a headspace-gas chromatography-mass spectrometer during one sample injection; under adopted chromatographic conditions, chromatographic peaks of benzene, toluene, ethylbenzene, orthoxylen, m-xylene / p-xylene (m-xylene and p-xylene are not separated due to problems of a chromatographic column, but the calculation results are not influenced), and acetic acid vinyl ester target substance as well as two internal standard substances, namely isobutanol and 2-hexanone, are separated well. Results show that the regression equation correlation coefficient of each component reaches 0.999 or more, the quantitative determination limit of the benzene series substances is 0.01-0.02mg / kg, the quantitative determination limit of acetic acid vinyl ester is 0.10mg / kg, the mean relative standard deviation is 1.15%-3.75%, the adding standard recovery is 88.09%-95.44%; the method is fast, accurate, good in repeatability, high in recovery rate, good in practicability, and the like.

The invention relates to a method for detecting ethyl 5-isoquinoline sulfonate in fasudil hydrochloride. The method comprises the following steps: 1) preparing a test solution; 2) preparing a reference substance solution; and 3) carrying out headspace gas chromatography-mass spectrometry determination: carrying out headspace-gas chromatography-mass spectrometry determination on a series of reference substance solutions with different concentrations, which are prepared in the step 2) and contain the internal standard solution and the derivative solution, measuring and recording the quantitative ion peak areas of iodoethane and butyl iodide, drawing a standard curve and calculating to obtain a linear equation by adopting an internal standard method and taking the ratio of the quantitative ion peak areas of iodoethane and butyl iodide as a vertical coordinate and the ratio of the concentrations of iodoethane and butyl iodide as a horizontal coordinate, carrying out headspace-gas chromatography-mass spectrometry on the test solution, recording the quantitative ion peak areas of iodoethane and butyl iodide, and substituting the quantitative ion peak areas into a linear equation to calculate the content of ethyl 5-isoquinoline sulfonate in the test solution. The method is good in stability and high in accuracy, and the detection sensitivity can reach 0.03 [mu]g / mL.

The present invention relates to a method for detecting the concentration of six bufastenolide components in plasma or tissue in preparations containing bufa skin. The method comprises the following steps: (1) preparation of a stock solution: lipobufaxin, bufalin, cinobufogen, cinobufulin, celinobufagin and xenobufalin are respectively dissolved in (50 ±5)% acetonitrile aqueous solution to prepare standard stock solution; dissolving reserpine in (50 ± 5)% acetonitrile aqueous solution to prepare reserpine stock solution; (2) preparation of working solution; (3) Preparation of the sample solution to be tested; (4) subjecting the sample solution to be tested obtained in step (3) to liquid chromatography separation; subjecting the sample separated by liquid chromatography to mass spectrometry analysis. In the detection process of the method of the invention, the chromatographic peak shape is excellent, and the channel of each compound has only a unique target peak, which avoids other interferences such as solvent effects, and has the advantages of simple operation, rapid analysis, high specificity and high resolution.

The invention discloses a coagulated and twisted fiber strand and a continuous forming method thereof. The continuous forming method comprises the following steps that continuously fed fibers are subjected to rotary coagulation and twisting, are subjected to twist increase and are led out, so as to obtain the continuous coagulated and twisted fiber strand. The rotary coagulation and twisting means that the fibers are centrifugally coagulated and twisted; the twist increase means that the twist of the fiber strand subjected to rotary coagulation and twisting is increased, and all or part of the increased twist is removed after the fiber strand is led out; the prepared coagulated and twisted fiber strand is the continuous fiber strand of which the fibers are in a single fiber state and are uniformly distributed in the longitudinal direction; and the linear density range of the fiber strand is 1000-2000 tex, and the twist range of the fiber strand is 5-20 twists / m. By means of the continuous forming method for the coagulated and twisted fiber strand, the fiber strand meeting the requirement for super-large drafting of a spinning frame can be prepared, and an effective method is provided for achieving super-large drafting of the spinning frame; and the quantitation of the prepared coagulated and twisted fiber strand is between existing roving quantitation and drawn sliver quantitation, the requirement of super-large drafting on fiber strand quantitation can be met, the fiber strand has a certain twist, and the phenomena of fiber strand end breakage and accidental drafting during spinning can be effectively solved.

The invention discloses a method for simultaneous detection of 13 benzene compounds and phthalic acid ester compounds in a water-borne adhesive. The method comprises the steps of oscillating to disperse samples by adopting ultrapure water, then extracting through cyclohexane and filtering to obtain a sample solution, and simultaneously detecting 13 compounds in the water-based adhesive for cigarettes in one-time sample feeding by utilizing a gas chromatograph-mass spectrometer. The chromatographic peak has good separation effect, and the result shows that the correlation coefficients of the regression equation of components all reach 0.997 or above, the quantitative detection limits of six benzene compounds are 0.04-0.07 microg / g, and the quantitative detection limits of seven phthalic acid ester compounds are 0.5-4.2 microg / g. The method has the advantages of accuracy, rapidness, high sensitivity, good repeatability, high recovery rate and the like, and conforms to the quantitative requirement.

Provided is a method for detecting nicotine optical isomers in buccal tobacco by using normal-phase liquid chromatography-tandem mass spectrometry. The method is characterized in that firstly, nicotine in the buccal tobacco is extracted, a chiral chromatographic column is adopted to separate the nicotine optical isomers, a post-column high-pressure infusion pump introduces isopropanol and conducts splitting, assay determination is conducted in combination with the tandem mass spectrometry, and therefore the sensitive detection and the separation of S-(-)-nicotine and R-(+)-nicotine are achieved. The method has the advantages that by the adoption of the post-column high-pressure infusion pump for introducing the isopropanol and conducting the splitting, the volume of a non-polar solvent added into a mass spectrometer is reduced, the volume of the polar solvent isopropanol is compensated at the same time, the ionization efficiency is improved, so that requirements of liquid chromatography-tandem mass spectrometry analysis are met, and the sensitivity of the analysis is improved; compared with current methods, the chromatographic separation degree of the two nicotine optical isomers is high, wherein retention time difference between the two nicotine optical isomers is one minute; the analysis time is short, wherein only seventeen minutes are needed.

The invention relates to a method for detecting ethyl 5-isoquinolinesulfonate in fasudil hydrochloride, which comprises: 1) preparation of the test solution; 2) preparation of the reference solution; 3) headspace gas chromatography-mass spectrometry Determination: Perform headspace-gas chromatography-mass spectrometry on a series of reference solutions with different concentrations of internal standard solution and derivative solution prepared in step 2), measure and record the quantitative ion peaks of ethyl iodide and butyl iodide Area, using the internal standard method with the ratio of ethyl iodide and butyl iodide quantitative ion peak area as the ordinate, with the ratio of ethyl iodide and butyl iodide concentration as the abscissa, draw a standard curve and calculate to obtain a linear equation; Test solution carries out headspace-gas chromatography-mass spectrometry and records the quantitative ion peak areas of ethyl iodide and butyl iodide, and substitutes into the linear equation to calculate the content of ethyl 5-isoquinolinesulfonate in the test sample. The method has good stability and high accuracy, and the detection sensitivity can reach 0.03 μg / mL.

The invention discloses a method for measuring ammonia content in electronic cigarette liquid by using ion chromatography. In this method, the e-cigarette liquid sample is extracted with an acid solution; if the sample is completely dissolved in the extract, the supernatant is filtered through a 0.45 μm aqueous microporous membrane; if the sample is in a suspension state, the extract is placed in a centrifuge tube , centrifuged at 10000r / min for 5min, and the clear liquid was filtered through a 0.45μm aqueous microporous membrane. After the above pretreatment is completed, the extract is introduced into an ion chromatograph for determination, and the external standard method is used for quantitative analysis. The operation of the invention is fast, simple and easy. The results show that ammonia has a good linear relationship in the linear range (R2≥0.999), the detection limit is 0.0350 μg / g, the quantification limit is 0.116 μg / g, and the recoveries of the three spiked levels are between 93.21% and 106.47%. , indicating that the method has high sensitivity, good repeatability and recovery.

The invention relates to a liquid drop non-damage separating device used for a microsyringe. The liquid drop non-damage separating device comprises a micro-sampling assembly, a support assembly, a position adjusting assembly and a super-lyophobic liquid separating piece. The micro-sampling assembly is fixed to a side plate of the support assembly through an elastic clamp, and the super-lyophobic liquid separating piece is fixed to a position adjusting rod of the transverse position adjusting assembly. The liquid drop non-damage separating device has the advantages that the liquid drop position is accurate; quantifying is accurate; application requirements of different fields can be met; operating efficiency can be promoted; the application range is wide.

The invention discloses an automatic quality detection cloud platform. The cloud platform receives product images and sends the product images to multiple terminals. Both the cloud platform and the multiple terminals judge product quality. The cloud platform integrates Each judgment result, and finally determine whether the product quality is qualified. The invention combines cloud computing and product quality detection, improves the automation degree of product quality detection, reduces detection cost, and expands the detection field.

The invention discloses a wear test device of an excavator bucket, belongs to the field of mechanical manufacture, and is suitable for a wear test of the excavator bucket 5. The bucket 5 comprises a front hinge point hole and a rear hinge point hole. The wear test device of the excavator bucket comprises a test bracket 1, a driving mechanism, a material tank 2 and a material. The front hinge point hole of the bucket 5 is hinged with the test bracket 1, and the rear hinge point hole of the bucket 5 is connected with the driving mechanism. The driving mechanism drives the bucket 5 to rotate around the front hinge point hole, so as to simulate a digging process of the bucket 5. The material tank 2 is arranged below the bucket 5, and the material is placed in the material tank 2 and located in a bucket 5 rotating region, namely a digging region. The wear test device takes the friction and wear life of the bucket as a main test purpose, also gives consideration on the structure fatigue life, performs a bench test, can accurately collect bucket wear information, facilitates analysis and improvement, and besides, also greatly saves the time and cost required by whole-machine tests and customer tests.

The invention relates to a method for analyzing nicotine optical isomers in an electronic cigarette liquid by using a positive-phase liquid chromatography-tandem mass spectrometry method. The method is characterized in that the nicotine optical isomers in the electronic cigarette liquid are separated by a chiral chromatographic column, a post-column high pressure liquid output pump is used for introducing isopropyl alcohol and separating flow, and the tandem mass spectrometry is used for analyzing. The method has the beneficial effects that (1) the nicotine optical isomers in the electronic cigarette liquid are analyzed by the positive-phase liquid chromatography-tandem mass spectrometry method, so as to separate and detect the nicotine optical isomers in the electronic cigarette liquid; (2) the post-column high pressure liquid output pump is used for introducing the isopropyl alcohol and separating flow, so that the amount of non-polarity solvent entering mass spectrometry is reduced, the amount of the isopropyl alcohol of polarity solvent is compensated, and the ionizing efficiency is improved; (3) compared with the prior art, the chromatography resolution of the two types of nicotine optical isomers is high, and the difference of retention times is 1min; the analysis time is short, and is only 17min; the sensitivity is high, and the quantitative detection of lower content of R-(+)-nicotine in the cigarette liquid can be realized.

The invention relates to a high performance liquid chromatography-tandem mass spectrometry detection method for a refreshing and refreshing liquid. The high performance liquid chromatography-tandem mass spectrometry detection method is used for detecting the concentrations of 10 active ingredients, namely puerarin, paeoniflorin, naringin, hesperidin, baicalin, berberine, tenuifolin, baicalein, emodin and chrysophanol, in the refreshing and refreshing liquid. Comprising the following steps: (1) preparing a stock solution: respectively dissolving each effective component in a 100% methanol solution to prepare a standard stock solution; (2) preparing a to-be-detected sample solution; and (3) performing liquid chromatography separation and mass spectrometry on the to-be-detected sample solution obtained in the step (2). The detection method provided by the invention has the advantages of excellent chromatographic peak shape, simple operation, rapid analysis, high specificity and high separation degree, and the channel of each compound only has a unique target peak.

The invention relates to a method for detecting the concentration of six bufadienolide components in a medicinal preparation containing toad skin in blood plasma or tissue. The method comprises the following steps: (1) preparing a stock solution, namely respectively dissolving resibufogenin, bufalin, cinobufagin, cinobufotalin, telocinobufagin and arenobufagin in a (50+ / -5)% acetonitrile aqueous solution to prepare a standard stock solution; dissolving reserpine in a (50+ / -5)% acetonitrile aqueous solution to prepare a reserpine stock solution; (2) preparing a working solution; (3) preparing ato-be-detected sample solution; (4) carrying out liquid chromatography separation on the to-be-detected sample solution obtained in the step (3); and carrying out mass spectrometric analysis on the sample subjected to liquid chromatography separation. In the detection process of the method, the chromatographic peak shape is excellent, a channel of each compound only has a unique target peak, theinterference of other effects such as solvent effects is avoided, and the method is easy to operate, rapid in analysis, high in specificity and high in separation degree.

The invention provides a method for analyzing a carbaryl pesticide residue in tobacco by using the combination of central cut two-dimensional liquid chromatogram and mass spectrum. The method comprises the steps of performing sample pretreatment on the tobacco to acquire a sample to be tested, and using a central cut two-dimensional liquid chromatogram and mass spectrum combined system to test thecarbaryl pesticide residue in the sample to be tested. The method for analyzing the carbaryl pesticide residue in the tobacco by using the combination of the central cut two-dimensional liquid chromatogram and mass spectrum provided by the invention, the pretreatment step is simple, the interference substances in the sample are effectively removed, the ion source pollution is reduced, the pesticide residue detection limit is improved, and thus the method is particularly suitable for improving the test repeatability and accuracy of the carbaryl in many samples.

A normal phase liquid chromatography-tandem mass spectrometry detection method of nicotine optical isomers in the mainstream smoke of cigarettes is characterized in that total particulate matters in smoke are captured by a Cambridge filter, nicotine is extracted with NaOH solution and n-hexane, the separation of the nicotine optical isomers is realized by adopting chiral chromatography-normal phase chromatography, isopropanol is introduced by a post-column high pressure infusion pump and is shunted, and tandem mass spectrometry is combined to carry out analysis. The method has the following advantages: 1, the nicotine optical isomers in the mainstream smoke of cigarettes are analyzed through adopting the normal phase liquid chromatography-tandem mass spectrometry; 2, the isopropanol is introduced by the isopropanol and is shunted to compensate the volume of a polar solvent entering a mass spectrometer, reduce the volume of a non-polar solvent and improve the ionization efficiency, so requirements of the liquid chromatography-tandem mass spectrometry are met; and 3, the chromatographic resolution of S-(-)-nicotine and R-(+)-nicotine is higher than that of existing methods (the retention time difference is 1 min), and the analysis time is short (only 17 min).

The invention relates to the technical field of food packaging technologies, and discloses a food quantitative automatic packaging device which comprises a mounting frame, sliding grooves are fixedly connected to the two sides of the top of the mounting frame, driving wheels are slidably connected into the sliding grooves, large gears are rotatably connected to the two sides of a fixing frame, and a fixing column is fixedly connected to the middle of the bottom of the mounting frame. And a food material box is clamped in the middle of the top of the mounting frame. When the food quality reaches the quantitative value set by a customized pressure spring, the customized pressure spring is pressed to move downwards, a driving wheel moves downwards to be meshed with a large gear, a sliding column is driven to move up and down, an angle rod is driven to be combined above a food bag at the top of a conveying belt, and the food bag is sealed through the high temperature of a heating wire; the piston is driven to extrude the air chamber up and down, generated air is sprayed out through the exhaust pipe, sundries, chippings and the like on the conveying belt are cleaned, the accuracy of food quality is guaranteed, errors are reduced as much as possible, and the requirement for food quantification is met.