摘要:
建立了蔬菜中克螨特残留量气相色谱测定方法,以石油醚/丙酮(1:1)或正己烷/丙酮(1:1)混合溶剂为提取剂,振荡萃取,通过液—液分配除去提取剂中的水溶性杂质和水分,并以弗罗里硅土层析柱去除提取液中的有机杂质,正己烷/乙酸乙酯(95:5)或正己烷/丙酮(95:5)洗脱剂洗脱克螨特,用GC-FPD(配S滤光片)测定克螨特残留量,色谱柱采用“农残Ⅱ”毛细管柱。结果表明,蔬菜样品中的克螨特平均添加回收率为88.5%～108.1%,相对标准偏差(RSD)为3.14%～9.54%,最小检测量为0.1 ng,检出限为0.01mg·kg-1。该方法简便、准确、能满足实际样品分析。
关键词:
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蔬菜 /
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克螨特 /
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残留 /
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测定 /
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气相色谱法
Abstract:
A method for determining propargite residue in vegetables was established by gas chromatography.The vegetable samples were treated with petroleum ether/acetone (1:1) or n-hexane/acetone (1:1),then extracted by agitation,the water-soluble impurities in the extract were removed by liquid-liquid partitioning method,the organic impurities were removed with florisil chromatography,then the detergent of n-hexane/ethyl acetate (95:5) or n-hexane/acetone (95:5) was used to elute propargite.Propargite was determined by GC-FPD (with S optical lamella),separated by"Pesticide Residuaes Ⅱ"capillary column.The results showed that the average recovery of propargite ranged from 88.5%～108.1%,and RSD ranged from 3.14%-9.54%, MDQ was 0.1 ng, LOD was 0.01 mg·kg-1 in vegetable samples.This method is simple,accurate,and it can satisfy the analysis of reality samples.
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