TITLE

Determination of hexavalent chromium by using speciated isotope-dilution mass spectrometry after microwave speciated extraction of environmental and other solid materials

AUTHOR(S)
Rahman, G. M. Mizanur; Kingston, H. M. Skip; Towns, Theodore G.; Vitale, Rock J.; Clay, Kyle R.
PUB. DATE
June 2005
SOURCE
Analytical & Bioanalytical Chemistry;Jun2005, Vol. 382 Issue 4, p1111
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Precise and accurate determination of hexavalent chromium in different types of solid environmental sample is regarded as a technical challenge with significant potential error if historically accepted methods are used. Microwave-assisted alkaline extraction (0.5 mol L−1 NaOH+0.28 mol L−1 Na2CO3) followed by anion-exchange chromatographic separation and inductively coupled plasma mass spectrophotometric detection has been shown to provide accurate and precise results. To obtain a better understanding of potential species conversion during and/or after extraction steps, speciated isotope-dilution mass spectrometry (SIDMS) (EPA Method 6800) metrology has been successfully applied as a diagnostic tool with the modified accompanying extraction version of EPA Method 3060A. In our study, aggregate materials distributed over a large area of a major western US state were found to contain a high concentration of total chromium (195±13 to 709±19 μg g−1) and significant amounts of Cr6+ (141±6 to 341±29 μg g−1) which are at least three orders of magnitude higher than the US EPA threshold limit (0.5 μg g−1). Sediment samples from a major western US state, studied independently, were found to contain less (1.77±0.34 μg g−1) or no Cr6+ in the presence of significant total chromium.
ACCESSION #
17434222

 

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