Method for fast detecting phenoxy carboxylic acid herbicide in water

Abstract

The invention belongs to the field of analysis of organics in the environment and relates to a method for fast detecting a phenoxy carboxylic acid herbicide in water. The method is a full-automatic on-line solid phase extraction / ultra-high performance liquid chromatography-tandem mass spectrometry (Online-SPE / UPLC-MS / MS) method. The method comprises the following steps of 1, preparing a reagent, 2, determining on-line solid phase extraction conditions, 3, determining chromatography conditions, 4, determining mass spectrometry conditions and 5, carrying out qualitative and quantitative analysis. The method realizes full-automatic analysis of a water sample. A collected water sample is orderly subjected to filtration, loading analysis and data processing without manual operation. Compared with the manual operation method, the method has high data precision and stability, greatly eliminates personal errors, and realizes fast and green analysis.

Description

technical field [0001] The invention belongs to the field of organic matter analysis in the environment, and in particular relates to a method for rapidly detecting phenoxycarboxylic acid herbicides in water. Background technique [0002] Phenoxycarboxylic acid herbicides were the first selective herbicides to be put into commercial production. Phenoxy alcohol herbicides are mainly used as stem and leaf treatment agents, applied to cereal crop fields, coniferous forests, non-cultivated land, pastures, lawns, etc., to control annual and perennial broad-leaved weeds, such as amaranth, quinoa, Ear, bindweed, purslane, vetch, Persian mother-in-law, wormwood, etc. Most broadleaf crops, especially cotton and grapes, are sensitive to these herbicides. [0003] Such herbicides are carboxylic acid herbicides with substituents on the α-C. Its basic chemical structures are: monochloro (2-methyl-4-chloro) series, dichloro (2,4-D) series, trichloro (2,4,5-t) series, see the specific s...

AI Technical Summary

Problems solved by technology

The biggest problem with this method is that on the one hand, the pretreatment process of esterification is not easy to control, and often produces more by-products that interfere with the measurement. On the other hand, human errors are larger and it is also very time-consuming.

[0019] At present, the reports on the multi-residue analysis of phenoxycarboxylic acid herbicides are mostly determined by gas chromatography or gas chromatography-mass chromatography. Because these compounds have strong polarity, poor stability, and are not easy to gasify, they need to be derivatized before using gas chromatography. Chromatography or gas chromatography-mass spectrometry, the entire operation process is cumbersome, time-consuming and laborious, and the derivatization reaction is likely to bring more by-products, which will interfere with the determination of the target compound

There are also reports in the literature that capillary electrophoresis is used for the separation and determination of phenoxycarboxylic acids. Capillary electrophoresis has a high degree of resolution, and chiral separation can be achieved for this type of pesticide, but the sensitivity is not high.

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