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110 results about "Alachlor" patented technology

Alachlor is an herbicide from the chloroacetanilide family. It is an odorless, white solid. The greatest use of alachlor is for control of annual grasses and broadleaf weeds in crops. Use of alachlor is illegal in the European Union and no products containing alachlor are currently registered in the United States.

Convergence chromatography analytical method for residue of herbicides in tobacco

The invention relates to a convergence chromatography analytical method for residue of herbicides in tobacco and particularly relates to a method for detecting herbicides such as napropamide, alachlor, quizalofop-p-ethyl, diphenamid, metolachlor and clomazone in tobacco by virtue of a UPC<2>. The convergence chromatography analytical method comprises the following steps: firstly, carrying out extraction and primary decontamination on the herbicides contained in tobacco by virtue of a QuRChERS method; secondly, carrying out solid phase extraction purification on an extracting solution by virtue of a Florisil column so as to further reduce the interference of matrixes to a to-be-detected target; thirdly, detecting the herbicides by virtue of an ultra-performance convergence chromatographic instrument, and carrying out quantitative analysis by virtue of an external standard method. According to the convergence chromatography analytical method, all target substances can be analyzed within five minutes by virtue of the ultra-performance convergence chromatographic instrument, and the dosage of an organic solvent is extremely low in the analysis process; the convergence chromatography analytical method has the advantages of high efficiency, sensitivity and environment friendliness.
Owner:CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT +1

High performance liquid chromatography-tandem mass spectrometry measuring method of three amide herbicides in tobacco and tobacco products

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.
Owner:CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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