Method for separating and enriching trifluralin herbicide in soil

Abstract

The invention discloses a method for separating and enriching a trifluralin herbicide in soil. The method comprises the steps: mixing isooctyl acrylate, divinylbenzene, Span80 and C7H8, and adding azodiisobutyronitrile to form an organic phase; adding acrylamide into a polyvinylpyrrolidone/graphene oxide aqueous solution, and then adding nano SiO2 to form an aqueous phase; adding the aqueous phaseto the organic phase to form a high internal phase emulsion; drying, thermopolymerizing and washing the high internal phase emulsion, and carbonizing for 2 hours at the temperature of 600 DEG C; drip-washing a carbonized monolithic column with an acetonitrile aqueous solution, eluating the trifluralin herbicide target enriched on the carbonized monolithic column by an acetic acid/acetonitrile solution, and collecting an eluate; and blowing the eluate to dry with liquid nitrogen, redissolving with acetonitrile to obtain a to-be-measured solution, and completing the separation and enrichment ofthe trifluralin herbicide in the soil sample. The method has good extraction and enrichment ability for the trifluralin herbicide, and can be applied to extraction, enrichment and separation analysisof the trace trifluralin herbicide in the soil sample.

Description

technical field [0001] The invention belongs to the technical field of analytical chemical sample pretreatment, in particular to a method for separating and enriching trifluralin herbicide in soil. The method prepares a carbonized monolithic column with strong extraction and high enrichment factor, which is used for the enrichment, separation and detection of the trifluralin herbicide target in soil. Background technique [0002] The chemical name of Trifluralin is 2,6-dinitro-N,N-dipropyl-4-trifluoromethylaniline, also known as Trifluralin or Fluoteli, etc., and its chemical formula is C 13 h 16 f 3 N 3 o 4 , is a commonly used dinitroaniline selective pre-emergent herbicide with a broad herbicidal spectrum and can effectively control annual grass weeds and some annual broadleaf weeds. It is mainly applied on the farmland of cash crops such as peanuts, cotton, flax, soybeans, alfalfa, etc., to prevent the growth of weeds. Trifluralin entering the water body through su...

AI Technical Summary

Problems solved by technology

Studies have shown that although the amount of trifluralin entering the soil and water is very small, trifluralin is not easy to degrade, easy to accumulate and migrate, and will cause carcinogenicity, teratogenicity and mutagenesis to humans, domestic animals and wild animals in the acute concentration range and other health hazards, so many countries have specified limit standards for them

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