嵌段分子筛聚合材料P123-SH萃取分离-石墨炉原子吸收光谱法分析痕量铬的形态  

Study on triblock copolymer mesoporous P123-SH material for the separation/extraction and determination of trace speciation of chromium by graphite furnace atomic absorption spectrometry

作　　者：周乐舟[1] 贺国文[2] 付胜[1] 高寿泉[1] 余克平[1] 周方钦[3] 

机构地区：[1]湖南省劳动卫生职业病防治所,长沙410007 [2]湖南城市学院化学与环境工程学院,益阳413000 [3]湘潭大学化学学院,湘潭411105

出　　处：《分析试验室》2012年第7期68-71,共4页Chinese Journal of Analysis Laboratory

基　　金：湖南省自科基金课题(05JJ40024)资助

摘　　要：研究了嵌段分子筛聚合材料P123-SH萃取分离-石墨炉原子吸收光谱法对尿中痕量铬的形态分析方法,探讨了嵌段分子筛聚合材料P123-SH吸附铬的原理和最佳条件。在pH 7.0、常温下,Cr3+和Cr(Ⅵ)被很好的分离,且Cr3+可被该材料定量吸附,其吸附容量为6.15 mg/g。吸附的Cr3+可用2 mol/L的HCl洗脱,用石墨炉原子吸收法测定洗脱下来的Cr3+,往溶液中加入0.1%抗坏血酸将Cr(Ⅵ)还原为Cr3+测总铬,Cr(Ⅵ)含量为总铬减去Cr3+,方法测定Cr3+的检出限为0.011μg/L(3σ,n=11),线性范围为0.1～10μg/L,加标回收率在94%～106%之间,对0.50μg/L的Cr3+溶液平行测定7次,RSD为3.6%。方法可应用于生物样品和环境样品中痕量铬的形态分析。A sensitive and selective method has been developed for the speciation analysis of Cr3＋ and Cr（Ⅵ） in urine using triblock copolymer mesoporous P123-SH material and graphite furnace atomic absorption spectrometry（GFAAS）.Under the optimized conditions（pH 7.0） Cr3＋ was retained on the triblock copolymer mesoporous material,then eluted with 2.0 mol/L HCl and determined by graphite furnace atomic absorption spectrometry（GFAAS）.Total chromium was determined after the reduction of Cr（Ⅵ） to Cr3＋ by ascorbic acid as a reducing reagent.The absorption capacity was 6.15 mg/g.The detection limit was 0.011 μg/L（3σ,n=11）.The linear range was 0.1~10 μg/L.The recoveries of Cr3＋ and Cr（Ⅵ） were 94.0%~106.0%.The RSD was 3.6%（n=7,c=0.50 μg/L）.The proposed method has been applied to the determination of speciation of chromium in urine samples and environmental water.

关 键 词：嵌段分子筛聚合材料P123-SH 萃取分离 石墨炉原子吸收法 铬 形态分析 

分 类 号：O657.3[理学—分析化学]