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首页> 外文期刊>Bulletin of the Chemical Society of Japan >Multielement Determination of Trace Metals in Seawater by Inductively Coupled Plasma Mass Spectrometry after Tandem Preconcentration Using a Chelating Resin
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Multielement Determination of Trace Metals in Seawater by Inductively Coupled Plasma Mass Spectrometry after Tandem Preconcentration Using a Chelating Resin

机译：螯合树脂串联富集-电感耦合等离子体质谱法测定海水中痕量金属

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摘要

A tandem preconcentration method using a chelating resin was exploited for simultaneous multielement determination of trace metals in seawater by inductively coupled plasma mass spectrometry (ICP-MS).In the first preconcentration step,500 mL of seawater sample was adjusted to pH 6.0,and the adsorption of trace metals on 0.4 g of Chelex-100 resin in dry weight was carried out at 55degC.After equilibrium,the resin was collected on a glass filter and rinsed with 30 mL of ammonium acetate solution (pH 6.0) to reduce major elements such as Na,K,Mg,and Ca that had been partly adsorbed on the resin.Then,trace metals on the resin were eluted with 7.5 mL of 2 M nitric acid and collected in a 30 mL polypropylene bottle.In the second preconcentration step,the mixture of the filtrate and the rinsing solution obtained in the first step was adjusted to pH 4.0,and metal adsorption on another 0.4 g of Chelex-100 resin was carried out at 20degC.In a similar manner to the first step,the resin collected on a glass filter was rinsed with 10 mL of ammonium acetate solution (pH 4.0),and trace metals adsorbed on the resin were eluted with 6 mL of 2 M nitric acid.This eluate was taken into the same polypropylene bottle as used in the first step.The final sample volume thus obtained was 15 mL including 1.5 mL of internal standard solution.Then a 33-fold preconcentration factor was achieved,where the recoveries for 33 elements were larger than 80%.The analytical results for trace metals in coastal seawater reference material (CASS-4) were in fairly good agreement with the certified or information values after correction with the recovery values.The coastal seawater samples from the Ise Bay and the Take Island were also analyzed by the present method.The concentrations for 20 trace metals in the Ise Bay coastal seawater were found to be more than 2-fold larger than those in the Take Island coastal seawater,indicating considerable anthropogenic pollution in the Ise Bay area.
机译：采用一种螯合树脂的串联预富集方法，通过电感耦合等离子体质谱法（ICP-MS）同时测定海水中的痕量金属。在第一预富集步骤中，将500 mL海水样品的pH调节至6.0，然后于55°C在干燥重量的0.4 g Chelex-100树脂上吸附微量金属。平衡后，将树脂收集在玻璃滤器上，并用30 mL乙酸铵溶液（pH 6.0）冲洗以减少主要成分，例如如Na，K，Mg和Ca被部分吸附在树脂上。然后，用7.5 mL的2 M硝酸洗脱树脂上的痕量金属，并收集到30 mL的聚丙烯瓶中。在第二个预浓缩步骤中，将第一步得到的滤液和漂洗液的混合物的pH值调节到4.0，并在20°C下在另外0.4 g的Chelex-100树脂上进行金属吸附。在玻璃滤器上用10 mL醋酸铵溶液（pH 4.0）冲洗，然后用6 mL 2 M硝酸洗脱树脂上吸附的痕量金属。将该洗脱液与第一个最终样品体积为15 mL，包括1.5 mL内标溶液，然后达到33倍的预富集系数，其中33种元素的回收率大于80％。沿海海水中痕量金属的分析结果校正后的参考值（CASS-4）与标准值或信息值非常吻合，对回收率值进行了校正。本方法还分析了伊势湾和竹岛的沿海海水样品中20种痕量的浓度。发现伊势湾沿海海水中的金属比竹岛沿海海水中的金属大2倍以上，这表明伊势湾地区存在大量人为污染。

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