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引用次数: 22
摘要
改良基质固相分散(MMSPD)和气相色谱法已被用于土壤中各类农药(吡虫威、甲螨灵、甲草胺、异丙林和戊二甲基灵)的定量分析。MMSPD以Florisil为分散剂，丙酮为溶剂。采用气相色谱-氮磷检测法(GC-NPD)测定。研究了农药在土壤中停留时间对回收率的影响。将MMSPD与连续液固萃取法(LSE)进行比较。MMSPD具有良好的提取效率和净化效率，得到的提取物无需进一步纯化即可直接进行GC分析。方法加样回收率为93% ~ 100%，相对标准偏差(rsd)小于10%。检出限(lod)为0.2 ~ 2.0 ng g-1。
Determination of Pesticide Residues in Soil by Modified Matrix Solid-Phase Dispersion and Gas Chromatography
Modified matrix solid-phase dispersion (MMSPD) and gas chromatography have been developed for quantitative analysis of various classes of pesticides (pirimicarb, metalaxyl, metolachlor, isopropalin and pendimethalin) in soil. MMSPD used Florisil as dispersant and acetone as solvent. Determination was carried out by gas chromatography with nitrogen-phosphorus detection (GC-NPD). The effect of the residence time of pesticides in soil on the recoveries was studied. MMSPD was compared with continuous liquid-solid extraction (LSE). MMSPD had good extraction efficiency and cleanup efficiency and the extract obtained could be directly subjected to GC analysis without further purification. The method gave recoveries ranging from 93% to 100% with relative standard deviations (RSDs) lower than 10%. The limits of detection (LODs) ranged from 0.2 to 2.0 ng g-1.
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