Online Sequential Fractionation Analysis of Arsenic Adsorbed onto Ferrihydrite by ICP-MS

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 sensi...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2020-11, Vol.92 (21), p.14309-14313
Main Authors: Wu, Debo, Yang, Shuiping, Li, Faliang, Zhu, Tenggao, Chen, Huanwen
Format: Article
Language:English
Subjects:
Adsorption
Ammonium
Ammonium dihydrogen phosphate
Ammonium nitrate
Arsenic
Arsenic - analysis
Arsenic - chemistry
Arsenic - isolation & purification
Chemical Fractionation - methods
Chemistry
Dominant species
Elution
Ferric Compounds - chemistry
Fractionation
Inductively coupled plasma mass spectrometry
Iron oxides
Limit of Detection
Mass Spectrometry
Mass spectroscopy
Oxalic acid
Substrates
Surface Properties
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Summary: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.).
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.0c03516