Concomitant reduction and immobilization of chromium in relation to its bioavailability in soils

Girish Choppala, Nanthi Bolan, Anitha Kunhikrishnan, William Skinner, Balaji Seshadri

Research output: Contribution to journalArticlepeer-review

72 Citations (Scopus)


In this study, two carbon materials [chicken manure biochar (CMB) and black carbon (BC)] were investigated for their effects on the reduction of hexavalent chromium [Cr(VI)] in two spiked [600 mg Cr(VI) kg−1] and one tannery waste contaminated [454 mg Cr(VI) kg−1] soils. In spiked soils, both the rate and the maximum extent of reduction of Cr(VI) to trivalent Cr [Cr(III)] were higher in the sandy loam than clay soil, which is attributed to the difference in the extent of Cr(VI) adsorption between the soils. The highest rate of Cr(VI) reduction was observed in BC-amended sandy loam soil, where it reduced 452 mg kg−1 of Cr(VI), followed by clay soil (427 mg kg−1) and tannery soil (345 mg kg−1). X-ray photoelectron microscopy confirmed the presence of both Cr(VI) and Cr(III) species in BC within 24 h of addition of Cr(VI), which proved its high reduction capacity. The resultant Cr(III) species either adsorbs or precipitates in BC and CMB. The addition of carbon materials to the tannery soil was also effective in decreasing the phytotoxicity of Cr(VI) in mustard (Brassica juncea L.) plants. Therefore, it is concluded that the addition of carbon materials enhanced the reduction of Cr(VI) and the subsequent immobilization of Cr(III) in soils.

Original languageEnglish
Pages (from-to)8969-8978
Number of pages10
JournalEnvironmental Science and Pollution Research
Issue number12
Publication statusPublished - 20 Jun 2015
Externally publishedYes


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