Simultaneous detection of bentazone, 2,4-d, 2,4-dichlorophenol, 2,4,6-trichlorophenol, pentachlorophenol in water

Abstract

The invention discloses a method for simultaneously detecting bentazone, 2,4-D, 2,4-dichlorophenol, 2,4,6-trichlorophenol and pentachlorophenol in water by liquid chromatography. Mixed standard solution of the above five substances; activation of solid phase extraction column; adsorption of water sample; drying; elution; More than 2 hours; after absorbing the upper NaOH solution with a 1ml injection needle, filter it through a 0.2μm GHP ARCRODIS 13 filter head into a 2ml injection bottle, then add 0.10-0.15ml HCL solution with a pH of 0.5M, mix well, inject and Obtain a chromatogram of the sample. It can extract and detect the content of the five compounds mentioned in water at the same time, which greatly reduces the pretreatment and detection time, improves the detection efficiency, and reduces the labor intensity of the detection personnel; it has low cost, high detection recovery and precision high degree of characteristics.

Description

technical field [0001] The invention belongs to the technical field of water quality detection, in particular to a method for simultaneously detecting bentazone, 2,4-D, 2,4-dichlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol in water by liquid chromatography. phenolic method. Background technique [0002] Both bentazone and 2,4-D are herbicides, and 2,4-D is also a plant growth agent; 2,4-dichlorophenol, 2,4,6-trichlorophenol, and pentachlorophenol belong to chlorophenols It is difficult to find suitable organic solvents for these five substances, which can be extracted from water samples in one step, and are suitable for direct gas phase or liquid phase determination. The existing standard methods are carried out step by step. In the current national "Drinking Water Standard Test Method" (GB5750-2006), bentazone and 2,4-D are first extracted with ethyl acetate, and then esterified with methyl iodide to form The more volatile methylated derivatives are then determ...

AI Technical Summary

Problems solved by technology

[0003] Because the organic compounds in water are extremely unstable, and the analysis method is cumbersome and time-consuming, to complete the detection task in a short period of time, it is necessary to equip two equipment and at least two detection personnel

Moreover, the recovery rate and precision of the two gas chromatography methods are not ideal due to the complicated pretreatment or the limitation of the method.

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