Effect of Valence State on ICP-OES Value Assignment of SRM 3103a Arsenic Spectrometric Solution
- 27 January 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 78 (5), 1651-1656
- https://doi.org/10.1021/ac051732i
Abstract
The certification of Standard Reference Material (SRM is a registered trademark of NIST) 3103a As Spectrometric Solution is based on the gravimetric preparation value that is verified by inductively coupled plasma optical emission spectrometry (ICP-OES) measurements. A disagreement between the gravimetric and the spectrometric values for a batch of As calibration solutions led to the discovery that the solutions contained a mixture of trivalent and pentavalent As species and that the pentavalent species was ∼8% more sensitive than the trivalent species with ICP-OES determination. The kinetics of the reaction between As metal and nitric acid were studied, and the results were applied to develop a procedure that would consistently produce single-species pentavalent As standards, which eliminates As speciation as a source of measurement bias in the SRM certification process.Keywords
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