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1引言利用微孔滤膜分离和富集样品中的痕量成分，是近年来发展的一项新技术。此技术是依据试样的体积与测定时的有机溶剂的体积比达到富集的目的。由于可高倍数富集及选用有机溶剂溶解收集物及膜，大大改善了检测限；而且过滤装置简易并可用常法测定，具有良好的应用前景。新亚
1 Introduction The use of microporous membrane separation and enrichment of trace elements in the sample is a new technology developed in recent years. This technology is based on the volume of the sample and the volume ratio of the organic solvent to achieve the purpose of enrichment. The detection limit can be greatly improved due to the high-fold enrichment and the selection of the organic solvent to dissolve the collected matter and the membrane. Moreover, the filtration device is simple and can be measured by an ordinary method, and has good application prospect. New Asia