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本文对含有痕量有机磷农药的水溶液提出了萃取、保存和分析的通用方法。水样(天然水和蒸馏水)加入少量己烷后,通过高速搅拌萃取,低浓度的萃取液经蒸发浓缩,然后用火焰光度计的气相色谱仪分析,检测极限一般为1 ppb。在所用实验条件下,所试16种有机磷农药中有13种可以萃取,萃取率在95％以上,萃取液可以稳定45天,本法同近年来研究的样品保存技术作了比较,并讨论了各自的优点。
In this paper, a general method for extraction, storage and analysis of aqueous solutions containing trace organophosphorus pesticides was proposed. After adding a small amount of hexane to the water sample (natural water and distilled water), the low concentration extract was concentrated by evaporation and then analyzed by gas chromatograph using a flame photometer. The detection limit was generally 1 ppb. Under the experimental conditions, 13 of the 16 kinds of organophosphorus pesticides tested can be extracted, the extraction rate is above 95% and the extract can be stable for 45 days. This method is compared with the sample preservation techniques studied in recent years and discussed The respective advantages.