Analytical Artifacts Associated with the Chelating Resin Extraction of Dissolved Rare Earth Elements in Natural Water Samples
Analytical Artifacts Associated with the Chelating Resin Extraction of Dissolved Rare Earth Elements in Natural Water Samples
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DOI：
10.1007/s10498-010-9100-5
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发表时间：
2010-03
影响因子：
1.6
通讯作者：
Intae Kim;Seolwon Kim;Guebuem Kim
中科院分区：
文献类型：
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作者：
Intae Kim;Seolwon Kim;Guebuem Kim
为了使用电感耦合等离子体质谱仪测定沿海海水和地下水样品中的稀土元素 (REE)，省时的螯合树脂柱方法已广泛用于小水量 (<100 mL)。我们在 pH 5.8–6.0、流速 <1.2 mL min−1 和湿树脂重量 1.2 g（Chelex 100，Bio-Rad，直径 7 mm）的提取条件下从大多数海水（包括经过认证的标准物质）和地下水样品中提取 REE，获得了改进的定量 (>95%) 结果。然而，我们经常遇到与螯合树脂提取一些富含有机物的沿海海水样品相关的重稀土元素（重稀土元素）相对于轻稀土元素（轻稀土元素）的大分馏。这种分馏可能是由于 HREE 与水样中的天然有机物质发生未识别的络合所致。我们的结果表明，许多先前的观察报告使用这种方法报告 HREE 的自然分馏可能具有误导性。因此，我们建议，对于具有较大基质效应的天然水样，应使用其中一种 HREE（即 Tm）作为加标或同位素稀释液来确认 REE 的定量（>95%）提取。
In order to determine rare earth elements (REE) in coastal seawater and groundwater samples using an inductively coupled plasma mass spectrometer, a time-efficient chelating resin column method has been widely used for small water volumes (<100 mL). We obtained improved, quantitative (>95%) results for extracting REE from most of the seawater (including the certified reference materials) and groundwater samples at extraction conditions of pH 5.8–6.0, flow rates <1.2 mL min−1, and 1.2 g of wet resin weight (Chelex 100, Bio-Rad, 7 mm diameter). However, we often encountered large fractionations of HREE (heavy REE) relative to LREE (light REE) associated with chelating resin extraction for some organic-rich coastal seawater samples. This fractionation could be due to unidentified complexation of HREE with natural organic substances in water samples. Our results imply that many previous observations reporting the natural fractionation of HREE using this method could have been misleading. Thus, we suggest that the quantitative (>95%) extraction of REE should be confirmed by using either one of the HREE (i.e., Tm) as a spike or isotope dilution for natural aqueous samples which have large matrix effects.