Different contributions of crystalline and non-crystalline iron (hydr)oxides on the mobilization and thionation of diphenylarsinic acid in a flooded paddy soil

IF 12.2 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Meng Zhu , Yuan Li , Xiaobao Wei , Zhenqi Yan , Lu Yang , Ruyi Yang
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Abstract

Iron reduction impacts the mobilization and thionation of diphenylarsinic acid (DPAA) in soil, but the contribution of crystalline and non-crystalline iron remains unknown. A paddy soil deficient in non-crystalline iron (P-Feo), crystalline and non-crystalline iron (P-Fed) were incubated with sulfate-plus-lactate, and the results were compared with paddy soil (P) in our previous study. For treatments without ferrous sulfide (FeS) precipitation, the solution-to-solid ratio (RL/S) of DPAA increased slightly and dramatically with iron reduction, respectively, for P-Feo and P, suggesting that the reduction of non-crystalline iron contributes more to DPAA mobilization than crystalline iron. The RL/S was > 0.667 and ≤ 0.667 for treatments without and with FeS, respectively, in P and P-Feo but not P-Fed, indicating that crystalline, rather than non-crystalline iron contributes more to DPAA sequestration through reduction and the subsequent FeS precipitation. The degree to which iron reduction facilitates DPAA mobilization or sequestration is likely determined by the composition and amount of iron in paddy soil, respectively. For treatments with FeS, the DPAA transformation rate was < 44 % and 74–86 %, respectively, in P-Feo and P-Fed after 90 days, with the maximum value comparable to those without FeS in P after 30 days. This suggests that the crystalline iron in P-Feo and the residual, small amount of non-crystalline iron in P-Fed could reduce DPAA thionation by forming FeS, and such effect seems to depend on both the composition and the amount of iron in paddy soil. The results would deepen our understanding of the “As-Fe-S” interactions in soil.

Abstract Image

结晶和非结晶铁(氢)氧化物对淹水水稻土中二苯larsinic酸的动员和硫代化的不同贡献
铁还原影响土壤中二苯larsinic酸(DPAA)的动员和硫代化,但结晶铁和非结晶铁的贡献尚不清楚。将缺乏非晶铁(P- feo)、结晶铁和非晶铁(P- fed)的水稻土与硫酸盐+乳酸培养,并与我们之前研究的水稻土(P)进行比较。在不沉淀硫化亚铁(fe)的处理下,P- feo和P的固液比(RL/S)分别随着铁的还原而略微和显著增加,表明非晶铁的还原对DPAA的动员作用大于晶铁。RL/S是>;在P和P- feo中,无FeS处理和有FeS处理的差异分别为0.667和≤0.667,而P- fed处理的差异不为0.667,表明结晶态铁比非结晶态铁更有助于通过还原和随后的FeS沉淀来固存DPAA。铁的还原促进DPAA的动员或封存的程度可能分别取决于水稻土中铁的组成和量。对于FeS处理,DPAA转化率为<;P- feo和P- fed在90 d后分别为44%和74-86%,最大值与P在30 d后无FeS组相当。这表明,P-Feo中的结晶铁和P-Fed中残留的少量非结晶铁可以通过形成FeS来降低DPAA硫离子化,而这种作用似乎与水稻土中铁的组成和含量有关。研究结果将加深我们对土壤中“As-Fe-S”相互作用的理解。
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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