Journal
CHEMOSPHERE
Volume 186, Issue -, Pages 928-937Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.07.126
Keywords
Biochar; Iron-impregnated biochar; Arsenic; Cadmium; Paddy soils; Rice grains
Categories
Funding
- National Natural Science Foundation of China [41301339]
- Key Discipline in Hunan Province (China)
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Hunan Provincial Natural Science Foundation of China [201722180]
- Fok Ying Tung Education Foundation [151029]
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In this study, the effects of biochar derived from rice-straw (biochar) and iron-impregnated biochar (Fe-biochar) on Cd and As mobility in rice rhizosphere and transfer from soil to rice were investigated with different application rates. 1-3% biochar reduced porewater Cd in rhizosphere but elevated soluble As, resulting in 49-68% and 26-49% reduction in the root and grain Cd, with a simultaneous increase in root As. Unlike biochar, 0.5% Fe-biochar decreased porewater As throughout rice growth, resulting in reduced root As, which, however, increased Cd uptake by root. Biochar-induced soil As mobilization was probably through competitive desorption and Fe-biochar-induced soil Cd mobilization was probably via soil acidification. The results suggested that biochar and Fe-biochar was effective in reducing Cd and As uptake by rice, respectively, so they may be used as emergency measures to cope with single Cd or As contamination in paddy soils. (C) 2017 Published by Elsevier Ltd.
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