期刊
ENVIRONMENT INTERNATIONAL
卷 68, 期 -, 页码 154-161出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envint.2014.03.017
关键词
Biochar; Metals; Rice; Bioaccumulation; Daily intake; As speciation; Cancer risk
资金
- National Natural Science Foundation of China [41271324]
- International Science & Technology Cooperation Program of China [2011DFB91710]
- Chinese Academy of Sciences Fellowships [2011Y2ZA02]
- NERC [NE/I003959/1] Funding Source: UKRI
- Natural Environment Research Council [NE/I003959/1] Funding Source: researchfish
Consumption of rice contaminated with potentially toxic elements (PTEs) is a major pathway for human exposure to PTEs. This is particularly true in China's so called Cancer Villages. In this study, sewage sludge biochar (SSBC) was applied to soil (at 5% and 10%) to suppress PTE phytoavailability and as a consequence to reduce PTE levels in rice grown in mining impacted paddy soils. Risk assessment indicated that SSBC addition (10%) markedly (P <= 0.05) decreased the daily intake, associated with the consumption of rice, of PTEs (As, Cd, Co, Cu, Mn, Pb and Zn by: 68, 42, 55, 29, 43, 38 and 22%, respectively). In treatments containing SSBC (10%) the health quotient (HQ) indices for PTEs (except for As, Cu and Mn) were <1, indicating that SSBC suppressed the health risk associated with PTEs in rice. The addition of SSBC (10%) markedly (P <= 0.01) reduced AsIII (72%), dimethylarsinic add (DMA) (74%) and AsV (62%) concentrations in rice. Consequentially, following SSBC application (10%), the incremental lifetime cancer (ILTR) value for iAs (AsIII + AsV) associated with the consumption of rice was significantly (P <= 0.01) reduced by 66%. These findings suggest that SSBC could be a useful soil amendment to mitigating PTE exposure, through rice consumption, in China's Cancer Villages. (C) 2014 Elsevier Ltd. All rights reserved.
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