Fate of arsenic in contaminated coastal soil induced by rising temperature and seawater intrusion

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research Pub Date : 2024-10-18 DOI:10.1016/j.marenvres.2024.106799

Meihua Lian , Xiangfeng Zeng , Lixia Li , Mingze Sun , Xiaojun Li

{"title":"Fate of arsenic in contaminated coastal soil induced by rising temperature and seawater intrusion","authors":"Meihua Lian , Xiangfeng Zeng , Lixia Li , Mingze Sun , Xiaojun Li","doi":"10.1016/j.marenvres.2024.106799","DOIUrl":null,"url":null,"abstract":"<div><div>Temperature rising and seawater intrusion are expected to influence the hydrologic regime and redox conditions in coastal soil, and the fate and mechanisms of biogeochemical cycling of Arsenic (As) in the specific environment are poorly understood. This work was carried out in an anaerobic operating chamber by adding sulfate to simulate seawater intrusion under various temperature. Results demonstrated the microbial community diversity was influenced by temperature and the highest Shannon and lowest Simpson index were found at 28 °C. Firmicutes was the dominant bacteria, accounting for 81.16%–93.99%. <em>Desulfosporosinus</em>, with the proportion increasing with temperature, showed a significantly positive correlation with S<sup>2−</sup> for sulfate addition treatments. Actually, transformation of As was meditated by the concentration and valence of sulfur and iron in soil. The dissimilatory reduction of arsenic-bearing Fe oxides occurring in the initial stage, is suspected to be the primary driver of As release. Then, concentration of As declined in aqueous phase due to the reduction of sulfate, and the proportion of residual speciation of As in solid phase increased with temperature, ranging from 6.78% to 27.70%. The results displayed the reducing condition due to seawater intrusion and temperature change could regulate the release and sequestration of As in the coastal soil.</div></div>","PeriodicalId":18204,"journal":{"name":"Marine environmental research","volume":"202 ","pages":"Article 106799"},"PeriodicalIF":3.0000,"publicationDate":"2024-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine environmental research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141113624004604","RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}

引用次数: 0

Abstract

Temperature rising and seawater intrusion are expected to influence the hydrologic regime and redox conditions in coastal soil, and the fate and mechanisms of biogeochemical cycling of Arsenic (As) in the specific environment are poorly understood. This work was carried out in an anaerobic operating chamber by adding sulfate to simulate seawater intrusion under various temperature. Results demonstrated the microbial community diversity was influenced by temperature and the highest Shannon and lowest Simpson index were found at 28 °C. Firmicutes was the dominant bacteria, accounting for 81.16%–93.99%. Desulfosporosinus, with the proportion increasing with temperature, showed a significantly positive correlation with S²⁻ for sulfate addition treatments. Actually, transformation of As was meditated by the concentration and valence of sulfur and iron in soil. The dissimilatory reduction of arsenic-bearing Fe oxides occurring in the initial stage, is suspected to be the primary driver of As release. Then, concentration of As declined in aqueous phase due to the reduction of sulfate, and the proportion of residual speciation of As in solid phase increased with temperature, ranging from 6.78% to 27.70%. The results displayed the reducing condition due to seawater intrusion and temperature change could regulate the release and sequestration of As in the coastal soil.

查看原文本刊更多论文

温度升高和海水入侵诱发的受污染沿海土壤中砷的命运。

温度升高和海水入侵预计会影响沿海土壤的水文机制和氧化还原条件，而人们对特定环境中砷（As）的归宿和生物地球化学循环机制知之甚少。这项工作在厌氧操作室中进行，通过添加硫酸盐模拟不同温度下的海水入侵。结果表明，微生物群落多样性受温度影响，28 ° C 时香农指数最高，辛普森指数最低。固着菌是优势菌，占 81.16%-93.99% 。脱硫孢子菌的比例随温度升高而增加，在添加硫酸盐的处理中，脱硫孢子菌与 S2- 呈显著正相关。实际上，土壤中硫和铁的浓度和价态对砷的转化起着中介作用。在初始阶段，含砷铁氧化物的异氨还原被认为是砷释放的主要驱动力。随后，由于硫酸盐的还原作用，水相中的砷浓度下降，固相中残留砷的比例随温度升高而增加，从 6.78% 到 27.70%。结果表明，海水入侵和温度变化导致的还原条件可以调节沿海土壤中 As 的释放和固碳。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Marine environmental research 环境科学-毒理学

CiteScore

5.90

自引率

3.00%

发文量

217

审稿时长

46 days

期刊介绍： Marine Environmental Research publishes original research papers on chemical, physical, and biological interactions in the oceans and coastal waters. The journal serves as a forum for new information on biology, chemistry, and toxicology and syntheses that advance understanding of marine environmental processes. Submission of multidisciplinary studies is encouraged. Studies that utilize experimental approaches to clarify the roles of anthropogenic and natural causes of changes in marine ecosystems are especially welcome, as are those studies that represent new developments of a theoretical or conceptual aspect of marine science. All papers published in this journal are reviewed by qualified peers prior to acceptance and publication. Examples of topics considered to be appropriate for the journal include, but are not limited to, the following: – The extent, persistence, and consequences of change and the recovery from such change in natural marine systems – The biochemical, physiological, and ecological consequences of contaminants to marine organisms and ecosystems – The biogeochemistry of naturally occurring and anthropogenic substances – Models that describe and predict the above processes – Monitoring studies, to the extent that their results provide new information on functional processes – Methodological papers describing improved quantitative techniques for the marine sciences.