Speciation of chromium from industrial wastes and incinerated sludges

József Prokisch, Sidney A. Katz, Béla Kovács, Zoltán Gyori

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Abstract

In this study, the Cr(III) and Cr(VI) contents of seven international standards, wastes, incinerated wastes and ash samples were measured with a simply hyphenated system. The Cr(III) and Cr(VI) content was measured using an on-line method, which contained an acid-activated aluminium oxide filled microcolumn that was developed especially for the study and an inductively coupled plasma atomic emission spectrometer. The sample introduction and the steps in on-line measurement were controlled by an autosampling program. For lower chromate concentrations, a similar, but off-line separation method was applied with an aluminium-oxide filled solid-phase extraction column and a graphite furnace atomic absorption spectrometer. Acid-activated aluminium oxide adsorbs the Cr(VI) in the pH 2-7 range, but does not adsorb the Cr(III). The adsorbed Cr(VI) can be eluted with strong acid. The changes in chromium forms were studied in the waste burning process as well. In our incineration studies, we obtained the following results: A portion of the chromium(III) content of wastes can be oxidised to chromium(VI) by the incineration process. It increases the potential risk of air and soil contamination of chromium(VI).

Original languageEnglish
Pages (from-to)363-371
Number of pages9
JournalJournal of Chromatography A
Volume774
Issue number1-2
DOIs
Publication statusPublished - Jul 11 1997

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Keywords

  • Chromium
  • Environmental analysis
  • Metals

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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