微波消解-电感耦合等离子体质谱法同时测定废水中20种元素

摘要

Twenty kinds of elements such as Be,V,Cr,Mn,Co,Ni,Cu,Zn,As,Se,Mo,Ag,Cd,Sb,Ba,Hg,T1,Pb,Th and U in wastewater were simultaneously determined by inductively coupled plasma mass spectrometry with microwave digestion. After test results comparison of 5 digestion systems for the wastewater,HNO3 + H2O2 system was finally taken for the determination. The calibration curves showed a good linearity from 5.00 μg/L to 500 μg/L for Be,V,Cr,Mn,Co,Ni,Cu,Zn,As,Se,Mo,Ag,Cd,Sb,Ba,Tl,Pb,Th and U,and from 0. 050 μg/L to 2. 00 μg/L for Hg. Detection limits ranged from 0. 01 μg/L to 0. 2 μg/L. Test results of national standard material meet the requirements. RSD of duplicated wastewater samples test ranged from 2.6% to 6.5% . Spiked recoveries ranged from 84% to 110%.%采用微波消解－电感耦合等离子体质谱法,同时测定了废水中Be、V、Cr、Mn、Co、Ni、Cu、Zn、As、Se、Mo、Ag、Cd、Sb、Ba、Hg、Tl、Pb、Th、U等20种元素,比较了5种不同消解体系对废水样品的加标回收结果,确定采用硝酸+过氧化氢消解体系.Hg在0.050 μg/L ～ 2.00μg/L、其他元素在5.00 μg/L ～ 500 μg/L范围内线性良好,检出限为0.01μg/L ～0.2 μg/L,国家有证标准物质的测定结果符合要求,废水样品平行测定的RSD为2.6％ ～ 6.5％,加标回收率为84％～110％.