41results about How to "Experimental operation is fast" patented technology

The invention discloses a method for measuring residues of three phenoxy carboxylic acid pesticides in tobacco and tobacco products. The method is characterized by comprising the following steps of: digesting a sample by using acetonitrile; adding anhydrous magnesium sulfate, sodium chloride, sodium citrate and sodium hydrogen citrate to oscillate for layering; and subsequently, performing dispersive solid-phase extraction, and directly measuring the pesticide residues of 2,4-drop, 2,4,5-mucus and dicamba in the tobacco and tobacco products through liquid chromatogram-tandem mass spectrometry. According to the method, the defects of the sample treatment method in the prior art are overcome, and the sample pretreatment method and the instrument detection conditions are optimized aiming at the tobacco products; and compared with the prior art, the method has the beneficial effects that the sample pretreatment process is simple and rapid, derivatization is not required, and the method has the advantages that operation is accurate, sensitivity is high and repeatability is high.

The invention relates to a high performance liquid chromatography-tandem mass spectrometry measuring method of three amide herbicides (i.e., alachlor, metolachlor and napropamide) in tobacco and tobacco products, which belongs to the technical filed of physical and chemical inspection of pesticide residue in the tobacco and tobacco products. The high performance liquid chromatography-tandem mass spectrometry measuring method is characterized by being the method which is used for directly extracting the pesticide residue by a substrate dispersion solid-phase extraction method to directly measure the pesticide residue in the tobacco and tobacco products by virtue of chromatography-tandem mass spectrometry. The high performance liquid chromatography-tandem mass spectrometry measuring method of three amide herbicides in tobacco and tobacco products disclosed by the invention can be used for overcoming the defects of the sample treatment method in the prior art, and optimizing the sample pre-treatment method and the apparatus detection condition for the tobacco sample. Moreover, compared with the prior art, the method disclosed by the invention has the excellent effects that the sample pre-treatment process of the method is simple and quick, capable of reducing the interferences of the impurities including pigment and the like in the tobacco, and provided with the advantages of being accurate to operate, high in flexibility and good in repeatability.

The invention discloses a method for detecting volatile disinfection by-products including trihalomethane and trichloronitromethane in drinking water or sewage by a solid phase microextraction-gas chromatography-mass spectrometry technique. A metal organic framework material MIL-96 is used as a coating material of a solid-phase microextraction probe for the first time and applied to pretreatment of the volatile disinfection by-products to establish a complete novel trihalomethane and trichloronitromethane analytic detection method along with gas chromatography-mass spectrometry. The MIL-96 coating material is high in adsorption capacity and heat resistance and higher than commercial coatings in extraction power and enables recycling of aged probes. The method is 0.02-50microgram / L in linear detection range, 0.0030-0.0110microgram / L in detection limit and 81.0%-109.9% in standard recovery rate, has advantages of high sensitivity, simplicity, quickness, high repeatability and the like and is suitable for popularization and application.

The invention provides a method for determining the residual amount of three phenoxycarboxylic acid pesticides in tobaccos by adopting an ultrahigh performance convergence chromatography-tandem mass spectrometry. The method is characterized by comprising the following steps: extracting a sample by utilizing a 0.5mol / L hydrochloric acid solution; carrying out back extraction by adopting dichloromethane and determining the residual amount of the pesticides including 2,4-D, 2,4,5-T and dicamba in the tobaccos by adopting the ultrahigh performance convergence chromatography-tandem mass spectrometry. By adopting the method provided by the invention, the disadvantages of a sample treatment method in the prior art are overcome; a sample pre-treatment method and instrument detection conditions aiming at tobacco samples are optimized; compared with the prior art, the method provided by the invention has the following good effects that a sample pre-treatment process of the method is simple and rapid and derivatization is not needed; the method is green and environmentally friendly and has the advantages of accuracy in operation, high sensitivity and good repeatability.

The invention discloses a method for evaluating the quality of honeysuckle. The method measures chlorogenic acid, luteolin and six iridoid glycoside components in honeysuckle, wherein the six iridoid glycoside components are Loganic acid, morroniside, loganin, dangdaoside, broken-oxyloganin, and bistroside dimethyl acetal. In the present invention, for the first time, the iridoid glycosides in honeysuckle are included in the quality evaluation system of honeysuckle, and in order to ensure the reliability and effectiveness of the quality evaluation method, six representative iridoid glycosides in honeysuckle are selected for determination , and for the first time established a dispersive solid phase extraction-high performance liquid chromatography (DSPE-HPLC) method to detect these six iridoid glycosides with different structures, which significantly improved the reliability and effectiveness of the quality evaluation of honeysuckle, thereby further It has improved the quality control level of honeysuckle medicinal materials and related finished medicines, which is of great significance for guiding clinical application.

The invention discloses a method for simultaneously measuring residual quantity of three types of herbicide in vega soil, belonging to the technical field of physicochemical detection of pesticide residue in vega soil. Specifically, acetonitrile is used for extraction, Florisil is carried out with solid phase extraction, a gas chromatograph is matched with an electron capture detector to directlymeasure the residual quantity of three types of herbicide, such as propanil, Rimsulfuron, quizalofop-p-ethyl and the like in vega soil. The invention overcomes the restriction of the defect and the condition of the prior art to optimize the pretreatment method and the instrument detection condition of vega soil samples. Compared with the prior art, the invention has the following favorable advantages that the invention can detect three types of herbicide all at once and has the advantages of simple pretreatment process, high detection sensitivity and good accuracy and reproducibility.

The present invention relates to an electrochemical test apparatus for the corrosion on a reclaimed water pipeline system in a flowing system. In the prior art, the traditional method can affect the specific process corrosion mechanism determination, and the static electrochemical test device cannot well simulate actual pipeline flowing condition. In order to overcome the defect in the prior art, the invention provides the long-term real-time nondestructive electrochemical test apparatus so as to assist the intermittent sampling test result, such that the corrosion mechanism of the reclaimed water pipeline system in the flowing system can be easily analyzed. The technical scheme of the present invention is that the electrochemical test apparatus comprises a nodular cast iron working electrode, an Ag / AgCl reference electrode, a platinum sheet auxiliary electrode having a purity of 99.99%, a supported annular reactor having a hole on the outer wall, and a motor. The apparatus and the method of the present invention are mainly used for the electrochemical test of the corrosion on the reclaimed water pipeline system.