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Simultaneous speciation of arsenic, selenium, and chromium: species stability, sample preservation, and analysis of ash and soil leachates

  • Ruth E. WolfEmail author
  • Suzette A. Morman
  • Philip L. Hageman
  • Todd M. Hoefen
  • Geoffrey S. Plumlee
Original Paper

Abstract

An analytical method using high-performance liquid chromatography separation with inductively coupled plasma mass spectrometry (ICP-MS) detection previously developed for the determination of Cr(III) and Cr(VI) has been adapted to allow the determination of As(III), As(V), Se(IV), Se(VI), Cr(III), and Cr(VI) under the same chromatographic conditions. Using this method, all six inorganic species can be determined in less than 3 min. A dynamic reaction cell (DRC)–ICP-MS system was used to detect the species eluted from the chromatographic column in order to reduce interferences. A variety of reaction cell gases and conditions may be utilized with the DRC–ICP-MS, and final selection of conditions is determined by data quality objectives. Results indicated all starting standards, reagents, and sample vials should be thoroughly tested for contamination. Tests on species stability indicated that refrigeration at 10 °C was preferential to freezing for most species, particularly when all species were present, and that sample solutions and extracts should be analyzed as soon as possible to eliminate species instability and interconversion effects. A variety of environmental and geological samples, including waters and deionized water [leachates] and simulated biological leachates from soils and wildfire ashes have been analyzed using this method. Analytical spikes performed on each sample were used to evaluate data quality. Speciation analyses were conducted on deionized water leachates and simulated lung fluid leachates of ash and soils impacted by wildfires. These results show that, for leachates containing high levels of total Cr, the majority of the chromium was present in the hexavalent Cr(VI) form. In general, total and hexavalent chromium levels for samples taken from burned residential areas were higher than those obtained from non-residential forested areas. Arsenic, when found, was generally in the more oxidized As(V) form. Selenium (IV) and (VI) were present, but typically at low levels.

Keywords

Speciation HPLC-ICP-MS Arsenic Selenium Chromium Hexavalent chromium 

Supplementary material

216_2011_5275_MOESM1_ESM.pdf (706 kb)
ESM 1 (PDF 705 kb)

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Copyright information

© Springer-Verlag (outside the USA) 2011

Authors and Affiliations

  • Ruth E. Wolf
    • 1
    Email author
  • Suzette A. Morman
    • 1
  • Philip L. Hageman
    • 1
  • Todd M. Hoefen
    • 1
  • Geoffrey S. Plumlee
    • 1
  1. 1.US Geological SurveyDenver Federal CenterDenverUSA

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