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Online Sequential Fractionation Analysis of Arsenic Adsorbed onto Ferrihydrite by ICP-MS
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-10-14 , DOI: 10.1021/acs.analchem.0c03516 Debo Wu 1 , Shuiping Yang 1 , Faliang Li 1 , Tenggao Zhu 1 , Huanwen Chen 1
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-10-14 , DOI: 10.1021/acs.analchem.0c03516 Debo Wu 1 , Shuiping Yang 1 , Faliang Li 1 , Tenggao Zhu 1 , Huanwen Chen 1
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Fractionation information on arsenic (As) in complex samples, particularly solid samples, is of immense interest. Herein, selective extraction of various As species adsorbed onto ferrihydrite as the model substrate was online-adapted to inductively coupled plasma-mass spectrometry (ICP-MS) for sensitive detection. The As-adsorbed ferrihydrite sample was loaded into a homemade online sequential elution device using two commercially available micropipette tips, and then, each fraction of As including nonspecifically adsorbed, specifically adsorbed, iron oxide bonded, and residual species was successively extracted for ICP-MS detection, with H2O, NH4NO3, NH4H2PO4, ammonium oxalate, and HF as the eluents, respectively. While no water-soluble As was detected, the fraction of As bonded to iron oxide was detected as the dominant species (>80%), and the specifically adsorbed As and residual As also accounted for a substantial amount (10%). The method had a detection limit of 0.008 μg/kg for As(III) and 0.013 μg/kg for As(V), with merits such as extremely low sample consumption, high throughput, and minimized experimental manipulation, presenting an alternative strategy for sensitive fractionation analysis of As adsorbed onto solid substrates (e.g., iron oxides, etc.).
中文翻译：
ICP-MS在线分析水合砷吸附砷
复杂样品（尤其是固体样品）中砷（As）的分馏信息备受关注。在这里，选择性提取吸附在作为模型基质的水铁矿上的各种As物种在线适应于电感耦合等离子体质谱（ICP-MS）进行灵敏检测。使用两个市售微量移液器吸头将吸附有As的三水铁矿样品加载到自制的在线顺序洗脱设备中，然后将包括非特异性吸附，特异性吸附，氧化铁结合在内的As的各个部分依次萃取用于ICP-MS H 2 O，NH 4 NO 3，NH 4 H 2 PO 4检测，草酸铵和HF分别作为洗脱液。尽管未检测到水溶性的As，但检测到与氧化铁结合的As的部分为主要物质（> 80％），而且特异性吸附的As和残留的As也占了相当大的比例（10％）。该方法的砷（III）的检出限为0.008μg/ kg，砷（V）的检出限为0.013μg/ kg，具有极低的样品消耗，高通量和最小化实验操作等优点，为灵敏检测提供了另一种方法吸附在固体基质（例如氧化铁等）上的As的分馏分析。
更新日期：2020-11-03
中文翻译：
ICP-MS在线分析水合砷吸附砷
复杂样品（尤其是固体样品）中砷（As）的分馏信息备受关注。在这里，选择性提取吸附在作为模型基质的水铁矿上的各种As物种在线适应于电感耦合等离子体质谱（ICP-MS）进行灵敏检测。使用两个市售微量移液器吸头将吸附有As的三水铁矿样品加载到自制的在线顺序洗脱设备中，然后将包括非特异性吸附，特异性吸附，氧化铁结合在内的As的各个部分依次萃取用于ICP-MS H 2 O，NH 4 NO 3，NH 4 H 2 PO 4检测，草酸铵和HF分别作为洗脱液。尽管未检测到水溶性的As，但检测到与氧化铁结合的As的部分为主要物质（> 80％），而且特异性吸附的As和残留的As也占了相当大的比例（10％）。该方法的砷（III）的检出限为0.008μg/ kg，砷（V）的检出限为0.013μg/ kg，具有极低的样品消耗，高通量和最小化实验操作等优点，为灵敏检测提供了另一种方法吸附在固体基质（例如氧化铁等）上的As的分馏分析。
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