【摘要】 介绍巯基棉富集－毛细管气相色谱法测定环境水、沉积物和土壤样品中痕量甲基汞的分析方法．对毛细管柱与填充柱分析样品中甲基汞的精密度、检测限进行了对比．研究表明，填充柱分析甲基汞的检测限为２ｐｇ，而毛细管柱色谱对甲基汞的检测限为０．５ｐｇ．且毛细管柱色谱分析甲基汞的精密度明显优于填充柱色谱，证明了毛细管柱分析甲基汞的优越性．本文也对巯基棉富集甲基汞的操作条件进行了优化选择，得到的最佳条件为样品ｐＨ值３～５，过柱速率２ｍｌ／ｍｉｎ～３ｍｌ／ｍｉ更多还原

【Abstract】 Methylmercury in water,sediment and soil samples is preconcentrated onto a sulphydryl cotton adsorbent and analyzed by capillary column GCECD.A comparison is made about analysis of methylmercury between capillary column and packed column.The results show that the detection limit of capillary column analysis is 05pg,but packed column is 2pg.The precision of capillary column analysis is also superior to packed column.The operation condition of preconcentration is researched.The best condition obtained is 35 for pH of sample solution and 2ml/min3ml/min for flow rate.更多还原