摘要
基于微波消解和正相液相色谱－荧光检测测硒法，实现了对环境水样中亚纳克级硒的测定。考察了ＨＮＯ３和Ｈ２ＳＯ４－Ｈ２Ｏ２两种消化体系及其工作条件，方法检出限分别可达 ７．２和 １０．４ ｐｇ Ｓｅ，对标准参考物质的回收率分别为９９．４±２．０和９７．８±２．５％，在０～１．５ｎｇＳｅ范围内有线性关系（Ｒ２＜０．９９６）。对北京地区 ４种不同类型水体水样含硒量进行了分析测定（２ｍＬ样品），其浓度范围为 ０．２０～０．９０μｇ／Ｌ，标准加入回收率为９９．１％～１０３．４％。
A new approach, combining microwave digestion and sensitive determination of selenium by a normal-phase high performance liquid chromatography after derivatization with 2, 3-diamino-naphthalene was proposed to the measurements of trace selenium concentration in natural waters. Two digestions systems, i.e. HNO3 and H2SO4-H2O2, were evaluated and their working conditions were optimized. Under optimal conditions, this approach provides a detection limit of 7.2 pg (with HNO3) or 10.4 pg (with H2SO4-H2O2), a recovery of 99.1% similar to 103.4%, as well as a linear range of 0 similar to 1.5 ng Se(IV). The approach was applied to determine Se concentration in 4 different types of environmental waters (sample volume: 2 mi,) and the concentration levels of 0.20 similar to 0.90 mug/L were found, with recoveries of 99.1% similar to 103.4% by standard addition.
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
2001年第6期629-632,共4页
Chinese Journal of Analytical Chemistry
基金
国家自然科学基金(29677024)
国家基础研究发展规划资助项目(G1999045710)
