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

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

doi:10.1016/j.jhazmat.2020.122818

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

J Hazard Mater. 2020 Nov 5:398:122818. doi: 10.1016/j.jhazmat.2020.122818. Epub 2020 May 20.

Authors

Zhimin Sha¹, Zheng Chen², Yanfang Feng³, Lihong Xue⁴, Linzhang Yang⁵, Linkui Cao¹, Qingnan Chu⁶

Affiliations

¹ Graduate School of Agriculture and Biology, Shanghai Jiaotong University, Shanghai, 200240, China.
² Department of Health and Environmental Sciences, Xi'an Jiaotong-Liverpool University, Suzhou, 215123, Jiangsu, China.
³ Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs of People's Republic of China, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212001, China; Stockbridge School of Agriculture, University of Massachusetts, Amherst, MA, 01003, USA.
⁴ Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs of People's Republic of China, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212001, China.
⁵ Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs of People's Republic of China, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China.
⁶ Key Laboratory of Agro-Environment in Downstream of Yangtze Plain, Ministry of Agriculture and Rural Affairs of People's Republic of China, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China. Electronic address: chuqingnan@hotmail.com.

PMID: 32512435
DOI: 10.1016/j.jhazmat.2020.122818

Abstract

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.

Keywords: Arsenate adsorption; Arsenite oxidation; Iron plaque; Redox potential; Rhizosphere.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Arsenic* / analysis
Minerals
Oryza*
Oxygen
Soil
Soil Pollutants* / analysis

Substances

Minerals
Soil
Soil Pollutants
Arsenic
Oxygen