Abstract：
:This paper reports an experimental study on hexavalent chromium leaching from cement samples and cement composites containing silica fume and zeolite additions that were subjected to various leaching agents. The water-soluble Cr(VI) concentrations in cements ranged from 0.2 to 3.2 mg/kg and represented only 1.8% of the total chromium content. The presence of chromium compounds with both chromium oxidation states of III and VI was detected in the cement samples by X-ray photoelectron spectroscopy (XPS). Leaching tests were performed in a Britton-Robinson buffer to simulate natural conditions and showed increased dissolution of Cr(VI) up to 6 mg/kg. The highest amount of leached hexavalent chromium was detected after leaching in HCl. The findings revealed that the leaching of chromium from cements was higher by 55⁻80% than that from the cement composites. A minimum concentration was observed for all cement samples when studying the relationship between the soluble Cr(VI) and the cement storage time.
journal_name
Int J Environ Res Public Healthauthors
Estokova A,Palascakova L,Kanuchova Mdoi
10.3390/ijerph15040824subject
Has Abstractpub_date
2018-04-22 00:00:00issue
4eissn
1661-7827issn
1660-4601pii
ijerph15040824journal_volume
15pub_type
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journal_title：International journal of environmental research and public health
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