Measurement of labile Cu in soil using stable isotope dilution and isotope ratio analysis by ICP-MS

文献类型： 外文期刊

第一作者： Nolan, AL

作者： Nolan, AL;Ma, YB;Lombi, E;McLaughlin, MJ

作者机构：

关键词： soil;copper;labile pool;isotope dilution;isotope ratios;ICP-MS

期刊名称：ANALYTICAL AND BIOANALYTICAL CHEMISTRY （ 影响因子：4.142； 五年影响因子：3.863 ）

ISSN： 1618-2642

年卷期： 2004 年 380 卷 5-6 期

页码：

收录情况： SCI

摘要： Isotope dilution is a useful technique to measure the labile metal pool, which is the amount of metal in soil in rapid equilibrium (< 7 days) with the soil solution. This is normally performed by equilibrating soil with a metal isotope, and sampling the labile metal pool by using an extraction ( E value), or by growing plants ( L value). For Cu, this procedure is problematic for E values, and impossible for L values, due to the short half-life of the (64)Cu radioisotope (12.4 h), which makes access and handling very difficult. We therefore developed a technique using enriched (65)Cu stable isotope and measurement of (63)Cu/(65)Cu ratios by quadrupole inductively coupled plasma mass spectrometry (ICP-MS) to measure labile pools of Cu in soils using E value techniques. Mass spectral interferences in detection of (63)Cu/(65)Cu ratios in soil extracts were found to be minimal. Isotope ratios determined by quadrupole ICP-MS compared well to those determined by high-resolution ( magnetic sector) ICP-MS. E values determined using the stable isotope technique compared well to those determined using the radioisotope for both uncontaminated and Cu-contaminated soils.

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