Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 164, Issue 2-3, Pages 510-516Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.08.037
Keywords
Cr(VI)-spiked alkaline soils; Cr(VI) reduction; Ferrous iron; Sodium dithionite; Resin-extractable Cr(VI)
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Funding
- National Science Council, Taiwan, ROC [NSC-96-2628-E-002-011-MY2]
- National Synchrotron Radiation Research Center (NSRRC), Taiwan [2004-3-005]
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Ferrous iron. Na2S2O4, and a mixture of Fe(II) and Na2S2O4 (4:1 mol/mol) were tested for their effectiveness for decreasing resin-extractable Cr(VI) in alkaline Cr(VI)-spiked soils. The results indicated that adding those reductants greatly decreased the amount of resin-extractable Cr(VI) when the application rate of reductants equaled the number of equivalents of dichromate added to the Cr(VI)-spiked soils. This was mainly as a result of the Cr(VI) reduction into Cr(III), as supported by the XANES spectra. Among the tested reductants, a mixture of Fe(II) and Na2S2O4 was the most effective to decrease resin-extractable Cr(VI). The extent to which resin-extractable Cr(VI) and soil pH were decreased was affected by the pH of the reductants. Among the tested reductants at various pH, FeSO4 at pH below 1 was the most effective in decreasing resin-extractable Cr(VI) in alkaline soils. However, the soil pH was the most decreased as well. On the other hand, the mixtures of ferrous iron and dithionite at a wide range of pH were all efficient (>70% efficiency) in decreasing resin-extractable Cr(VI). Moreover, the extent of the decrease in soil pH was much smaller than that by FeSO4 (pH < 1) alone, and thus the possibility of the Cr(III) hazard can be avoided. (C) 2008 Elsevier B.V. All rights reserved.
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