文献类型：期刊文献

英文题名：Long-Term Effect of Wetting-Drying Cycles on the Bioavailability of Cuo Nanoparticles in the Paddy Soil

作者：Guo, Minxue[1]; Tong, Hong[1]; Cai, Dongqing[1]; Yuan, Peng[1]; Shen, Yihao[1]; Peng, Cheng[1,2]

机构：[1] College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China; [2] State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China

年份：2022

外文期刊名：SSRN

收录：EI(收录号：20220055871)

语种：英文

外文关键词：Biochemistry - Copper - Copper oxides - Drying - Floods - Iron oxides - Metal nanoparticles - Moisture determination - Precipitation (chemical) - Soil moisture - Sulfur compounds - Wetting

摘要：The extensive application of metal-based nanoparticles can pose environmental risks, but how the alternation of wet and dry caused by natural precipitation and artificial irrigation affects the environmental fate of nanoparticles is still unclear. Here, we investigated the underlying mechanisms of wetting-drying cycles (WDCs) on the bioavailability of CuO nanoparticles in paddy soil during 140 days by comparing with drought and flooding conditions. The results show that soil moisture content directly determined the soil pH and redox potential. The bioavailable Cu contents in the WDCs exposed to CuO nanoparticles were positively correlated to moisture content and WDCs number. The fit result of the pseudo-second-order equation indicates that WDCs greatly disturbed the aging process of CuO nanoparticles in soil. Furthermore, WDCs transformed oxidizable Cu to water-soluble, acid extractable and reducible Cu. WDCs markedly promoted the degradation of dissolved organic matter and the transformation of acid-soluble sulfate to water-soluble inorganic sulfate, meanwhile, significantly enhanced the concentration of crystalline iron oxides, but reduced the level of ferrous iron compared to the flooding. μ-XRF analysis shows that the fate of CuO nanoparticles might be mainly determined by Fe under WDCs condition but by S in flooded soil. ? 2022, The Authors. All rights reserved.