化学
镉
生物利用度
遗传算法
碱度
环境化学
生物量(生态学)
X射线光电子能谱
傅里叶变换红外光谱
核化学
碱土
硅
土壤水分
无机化学
农学
化学工程
有机化学
生态学
工程类
生物
生物信息学
作者
Lei Guo,Aiting Chen,Cai Li,Yaojin Wang,Dan Yang,Na He,Mingda Liu
标识
DOI:10.1016/j.jhazmat.2022.129526
摘要
The mechanism of silicon (Si) influencing cadmium (Cd) speciation and bioavailability in alkaline paddy soil solution remains unclear. Therefore, this study sought to elucidate the effect of Si on Cd by combining chemical analysis and rice pot experiments. In this work, the effects of Na2SiO3 alkalinity and the differences in Na+ were eliminated in all treatments, and the Cd speciation in soil solutions was determined in-situ using a Field-Donnan membrane technology (DMT) cell. Additionally, rice yields and the Cd content in various parts of the rice plant were studied. The results showed that Si application significantly increased rice biomass by 32% (P < 0.05) while significantly reduced the Cd content in brown rice by 52% (P < 0.01) and the free Cd2+ concentration in the soil solution. Further analysis of the interaction of Si and Cd using Fourier transform-infrared spectroscopy (FT-IR), Raman, and X-ray photoelectron spectroscopy (XPS) indicated that a Si-Cd complex was formed by Cd and Si-O groups. In summary, Si changed the chemical speciation of Cd in the alkaline soil solution and formed a water-soluble Si-Cd complex that the rice could not absorb, consequently reducing Cd bioavailability.
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