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Evaluation of internal standards for inductively coupled plasma-mass spectrometric analysis of arsenic in soils.

Evaluation of internal standards for inductively coupled plasma-mass spectrometric analysis of arsenic in soils.

Authors :
Alvarado TR
Lee AC
Tomlin B
Schwab P
Source :
Journal of environmental quality [J Environ Qual] 2022 Jul; Vol. 51 (4), pp. 765-773. Date of Electronic Publication: 2022 Jun 20.
Publication Year :
2022

Abstract

Arsenic (As) is a common contaminant in soils, and analysis of soils by inductively coupled plasma-mass spectrometry (ICP-MS) is often used to detect As in soil extracts. Internal standards (ISs) are part of ICP-MS analyses to enhance precision and accuracy by compensating for instrument variability; however, an improper choice of IS can result in negative analytical bias. The goal of this study was to develop a protocol for evaluating ISs commonly used in ICP-MS. Three soils of varying clay content and total As were extracted with a dilute electrolyte [0.005 mol L <superscript>-1</superscript> Mg(NO <subscript>3</subscript> ) <subscript>2</subscript> ] and an acid digest. Arsenic concentrations were quantified by ICP-MS using typical ISs: <superscript>6</superscript> Li, <superscript>45</superscript> Sc, <superscript>69</superscript> Ga, <superscript>89</superscript> Y, <superscript>103</superscript> Rh, <superscript>115</superscript> In, <superscript>159</superscript>  Tb, and <superscript>209</superscript> Bi. Standard addition was used as a benchmark for As quantification. The most consistent IS was <superscript>115</superscript> In. Elevated, naturally occurring concentrations were detected for several of the ISs, particularly in the total digests, emphasizing the necessity for screening soils prior to analysis.<br /> (© 2022 The Authors. Journal of Environmental Quality © 2022 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.)

Details

Language :
English
ISSN :
1537-2537
Volume :
51
Issue :
4
Database :
MEDLINE
Journal :
Journal of environmental quality
Publication Type :
Academic Journal
Accession number :
35580254
Full Text :
https://doi.org/10.1002/jeq2.20368