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Reductive Immobilization of Chromate in Water and Soil Using Stabilized Iron Nanoparticles

Yinhui Xu, Dongye Zhao

Water Res. 2007 May;41(10):2101-8.

PMID: 17412389

Abstract:

Laboratory batch and column experiments were conducted to investigate the feasibility of using a new class of stabilized zero-valent iron (ZVI) nanoparticles for in situ reductive immobilization of Cr(VI) in water and in a sandy loam soil. Batch kinetic tests indicated that 0.08g/L of the ZVI nanoparticles were able to rapidly reduce 34mg/L of Cr(VI) in water at an initial pseudo first-order rate constant of 0.08h(-1). The extent of Cr(VI) reduction was increased from 24% to 90% as the ZVI dosage was increased from 0.04 to 0.12g/L. The leachability of Cr preloaded in a Cr-loaded sandy soil was reduced by nearly 50% when the soil was amended with 0.08g/L of the ZVI nanoparticles in batch tests at a soil-to-solution ratio of 1g: 10mL. Column experiments indicated that the stabilized ZVI nanoparticles are highly deliverable in the soil column. When the soil column was treated with 5.7 bed volumes of 0.06g/L of the nanoparticles at pH 5.60, only 4.9% of the total Cr was eluted compared to 12% for untreated soil under otherwise identical conditions. The ZVI treatment reduced the TCLP leachability of Cr in the soil by 90%, and the California WET (Waste Extraction Test) leachability by 76%. The stabilized ZVI nanoparticles may serve as a highly soil-dispersible and effective agent for in situ reductive immobilization of chromium in soils, groundwater, or industrial wastes.

Chemicals Related in the Paper:

Catalog Number Product Name Structure CAS Number Price
AS21136 TCLP Metals - Sandy Loam 1 TCLP Metals - Sandy Loam 1 Price
AS21138 TCLP Metals - Sandy Loam 12 TCLP Metals - Sandy Loam 12 Price
AS21140 TCLP Metals - Loam 1 TCLP Metals - Loam 1 Price
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