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湿性样品中的多来宝残留物用丙酮（水样和干样用石油醚）提取，提取液经石油醚再萃取、浓缩后，用被石油醚饱和的乙腈分配，过硅胶氧化铝混合柱净化，室温下与（ＣＨ３）３ＳｉＩ衍生化反应，生成３－苯氧基苄基碘，用ＧＣ检测。当添加浓度为０．０５，０．１０，１．００μｇ／ｇ时，样品的平均回收率为８０．７％～１１０．０％，方法最小检出量为０．０１ｎｇ，样品最小检出浓度是：水０．００１ｍｇ／Ｌ，稻米和土壤０．０１μｇ／ｇ，稻草、谷壳、水浮莲和罗非鱼为０．００８μｇ／ｇ。
The sample of Dorothy in the wet sample is extracted with acetone (water sample and dry sample with petroleum ether), and the extract is extracted again with petroleum ether. After concentration, it is partitioned with acetonitrile saturated with petroleum ether and purified by a silica gel alumina column , Derivatized with (CH3) 3SiI at room temperature to form 3-phenoxybenzyl iodide and detected by GC. The average recoveries of the samples were 80.7% ~ 110.0% when the concentration was 0.05,0.10,1.00μg / g, the minimum detectable amount was 0.01ng, the minimum detectable concentration Is: 0.001 mg / L water, 0.01 μg / g rice and soil, 0.008 μg / g straw, chaff, water hyacinth and tilapia.