Minerals loaded with oxygen nanobubbles mitigate arsenic translocation from paddy soils to rice

文献类型： 外文期刊

第一作者： Sha, Zhimin

作者： Sha, Zhimin;Cao, Linkui;Feng, Yanfang;Xue, Lihong;Yang, Linzhang;Chu, Qingnan;Chen, Zheng;Feng, Yanfang;Xue, Lihong;Feng, Yanfang

作者机构：

关键词： Arsenite oxidation; Arsenate adsorption; Iron plaque; Redox potential; Rhizosphere

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

ISSN： 0304-3894

年卷期： 2020 年 398 卷

页码：

收录情况： SCI

摘要： Inhibiting reductive transformation of arsenic (As) in flooded paddy soils is fundamentally important for mitigating As transfer into the food chain. In this study, oxygen-nanobubble-loaded-zeolites (ZON) and -vermiculites (VON) were tested as a novel approach for supplying oxygen to paddy soils to inhibit As influx into rice. The dynamic physio- and bio-chemical variations in the rhizosphere and bulk soil were profiled in a rhizobox experiment. Upon adding ZON and VON, the redox potential and dissolved oxygen consistently increased throughout the cultivation period. The improved redox environment inhibited As(III) release into porewater and increased As(V) adsorbed on crystalline Fe (hydr)oxides, following the reduction of arsC and arrA gene abundances and enhancement of the aioA gene. Moreover, adding ZON and VON promoted root iron plaque formation, which increased As retention on iron plaque. Both ZON and VON treatments mitigated As translocation from soil to rice, meanwhile increasing root and shoot biomass. ZON was superior to VON in repressing As transfer and promoting rice growth due to its higher oxygen loading capacity. This study provides a novel and environment-friendly material to both mitigate the As translocation from paddy soil to rice and improve rice growth.

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