Determination of hexavalent chromium in South African cements and cement-related materials with electrothermal atomic absorption spectrometry
| Autor: | J.H. Potgieter, S.S Potgieter, S. Panicheva, N Panichev |
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| Rok vydání: | 2003 |
| Předmět: |
musculoskeletal diseases
Cement Chromium Compounds Metallurgy technology industry and agriculture chemistry.chemical_element Building and Construction equipment and supplies law.invention Chromium chemistry.chemical_compound Portland cement surgical procedures operative Certified reference materials chemistry law General Materials Science Hexavalent chromium Sodium carbonate Atomic absorption spectroscopy |
| Zdroj: | Cement and Concrete Research. 33:1589-1593 |
| ISSN: | 0008-8846 |
| DOI: | 10.1016/s0008-8846(03)00132-7 |
| Popis: | This paper seeks to develop a method to determine the total chromium (VI) in cement and cement-related materials, with the particular aim of ensuring that no changes take place in the original state of chromium owing to the sample preparation procedure. The selective extraction of chromium (VI) in a cement matrix, based on treatment with 0.1 M sodium carbonate (Na2CO3) solution and subsequent determination of chromium by electrothermal atomic absorption spectrometry has proposed and applied to South African cement clinkers, natural gypsum, limestone and certified reference materials. Between 30% and 80% of the total chromium in the cement clinkers are Cr(VI) compounds and 8-26% of the total amount of Cr(VI) species is water soluble. This disproves the general perception that all Cr(VI) in cement and cement-related materials is water soluble. Results from an analysis of a sulphate-resisting Portland cement compared with the certified values were used to verify the analytical performance of the proposed method. |
| Databáze: | OpenAIRE |
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