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首页> 外文期刊>The Analyst: The Analytical Journal of the Royal Society of Chemistry: A Monthly International Publication Dealing with All Branches of Analytical Chemistry >Inductively coupled palsma mass spectroetric determination of heavy metals in sea-water samples after pre-treatment with a chelating resin disk by an on-line flow injection method
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Inductively coupled palsma mass spectroetric determination of heavy metals in sea-water samples after pre-treatment with a chelating resin disk by an on-line flow injection method

机译：螯合树脂盘预处理在线流动注射电感耦合等离子体质谱法测定海水样品中的重金属

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摘要

A new on-line flow injection (FI) pre-treatment system using a disk-type chelating resin (5mm diameter,0.5 mm thickness) was developed for the simultaneous multi-element determination of trace metals in sea-water samples by inductively coupled plasma mass spectrometry (ICP-MS).A chelating resin possessing an iminodiacetate (IDA) functional group was used for the collection of trace elements and the elimination of alkali and alkaline earth metals in highly concentrated salt solution.A 1 ml volume of a sea-water sample (pH 5.5) was applied to the chelating resindisk.Considering the removal efficiency for Ca,50 mM ammonium acetate buffer solution(pH 5.5) was chosen as a sample carrier.The enriched trace metals were eluted with 0.1 M nitric acid and the eluate flowed into the ICP-MS sysem.The processing time for one sample was<6 min (350s).One of the important observations is the posibility of working with a low recovery,even lower than 50%.For example,several elements such as Mn,Cr,As,Mo,Ba and U,the recovery of which was<50% in a batch-wise method,showed good linearity and reproducibility.The proposed method was evaluated by anlayzing twokinds of sea-water certified reference materials,CASS-4 and NASS-5.Analytical data for eight heavy metals,V,Mn,Co,Ni,Cu,Mo,Cd and U,obtained from the present study agreed well with the certified values.
机译：开发了一种使用盘式螯合树脂（直径为5mm，厚度为0.5mm）的新型在线流动注射（FI）预处理系统，用于通过电感耦合等离子体同时测定海水样品中的痕量金属质谱（ICP-MS）。具有亚氨基二乙酸酯（IDA）官能团的螯合树脂用于收集痕量元素并消除高浓度盐溶液中的碱金属和碱土金属.1毫升体积的海水将水样品（pH 5.5）放入螯合树脂盘上，考虑到Ca的去除效率，选择50 mM乙酸铵缓冲溶液（pH 5.5）作为样品载体，用0.1 M硝酸洗脱富集的痕量金属，并洗脱液流入ICP-MS系统中，一个样品的处理时间少于6分钟（350s）。一个重要的观察结果是工作回收率低，甚至低于50％的可能性。锰，铬，砷，钼Ba和U分批回收的回收率<50％，显示出良好的线性和可重复性。该方法通过分析两种海水认证参考物质CASS-4和NASS-5进行了评估。从本研究中获得的八种重金属V，Mn，Co，Ni，Cu，Mo，Cd和U的数据与认证值非常吻合。

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