悬浮有机液滴微萃取对水样中痕量铅的测定

Suspension of Organic Liquid Microextraction Lead in Water

悬浮有机液滴微萃取成功用作一种石墨炉原子吸收法测定环境样品中痕量铅的方法。在含金属离子的水样中加入20L含有8-羟基喹啉作为络合剂的1-十一醇,将溶液搅拌一定时间,置于冰水浴中,冷却5min后,把凝固物移取到锥形瓶中使之融化,后取10L样品溶液直接用石墨炉原子吸收分光光度计测定。详细探讨了影响萃取及络合物形成的因素。在最佳条件下,相对标准偏差为±0.11%(10ng/mL),检出限为0.006ng/mL。该方法用于自来水、井水、河水及海水中痕量金属元素的测定,具有简单、成本低、有毒的有机溶剂使用量降至最低的特点。

Suspension of organic liquid microextraction was successfully used as a sample preparation method for graphite furnace atomic absorption spectrometry（GFAAS）. 20 L of 1- undecanol containing 8- hydroxyquinoline as the solution was stirred for the prescribed time.The sample was cooled in an ice bath for 5 min.The solidified extrat was transferred into a conical vial where it melted immediately, and then 10 L of it was analyzed by GFAAS.Factors that influence the extraction and complex, such as pH, concentration of 8--hydroxyquinoline, extraction time, sample volume and ionic strength were optimized.Under the optimized conditions, the relative standard deviation is ±5.4% （ 10 ng/mL）, detection limit for 0.028 ng/ mL. The procedure was applied to tap water,well water, river water and sea water,and had the advantages of simplicity, loweost,minimum organic solvent consumption.