[Effects of Soil Acidification on the Distribution and Availability of Arsenic in Aggregates].

Q2 Environmental Science
Sheng-Bai Xiao, Yan Xu, Shu-Ting Tang, Hao Cui, Shi-Qiang Wei
{"title":"[Effects of Soil Acidification on the Distribution and Availability of Arsenic in Aggregates].","authors":"Sheng-Bai Xiao, Yan Xu, Shu-Ting Tang, Hao Cui, Shi-Qiang Wei","doi":"10.13227/j.hjkx.202402134","DOIUrl":null,"url":null,"abstract":"<p><p>The spatiotemporal substitution method was used to collect yellow soil and purple soil with different acidification degrees; analyze the effects of acidification on the composition and properties of soil aggregates; explore the distribution characteristics, occurrence forms, and availability of arsenic (As) in soil aggregates with different acidification degrees; and reveal the key factors restricting the availability of soil As. The results showed that the distribution of total As in each aggregate was positively affected by its mass fraction, and the larger the mass fraction, the more the total As distribution. Soil acidification destroyed the aggregate structure, reduced the mass fraction of large aggregate S1 (&gt;2 mm) by 5 to 15 percentage points, led to the increase in amorphous iron content by 2 to 7 times, and decreased the total As distribution of S1. The available As was positively regulated by non-obligate/obligate adsorptive arsenic (F1, F2) (F1+F2 correlation coefficient 0.76) and negatively affected by residual arsenic (F5) (correlation coefficient -0.89). Soil acidification significantly reduced the ratio of F1 to F2 after exogenous As entered the soil, resulting in a decrease in <i>ω</i> (available As) from 6.71-15.37 mg·kg<sup>-1</sup> to 2.36-9.26 mg·kg<sup>-1</sup>, and the highest exogenous available As content was found in S1 and microaggregate S4 (&lt;0.25 mm). Simultaneously, exogenous available As was also negatively affected by organic matter (correlation coefficient -0.72) and positively regulated by available phosphorus and CEC (coefficients 0.40 and 0.52, respectively). There were differences in soil property factors that restricted the availability of As in aggregates of different particle sizes. Soil acidification in S2 (1-2 mm), S3 (0.25-1 mm), and S4 aggregates significantly increased the amorphous iron and thus reduced the availability of As, and the exogenous available As in S3 was not significantly affected by CEC. However, the effective As from all agglomerated sources was affected by organic matter, nitrogen, and potassium. The results provide a basis for the accurate control of soil As availability and pollution remediation.</p>","PeriodicalId":35937,"journal":{"name":"环境科学","volume":"46 3","pages":"1762-1773"},"PeriodicalIF":0.0000,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"环境科学","FirstCategoryId":"1087","ListUrlMain":"https://doi.org/10.13227/j.hjkx.202402134","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"Environmental Science","Score":null,"Total":0}
引用次数: 0

Abstract

The spatiotemporal substitution method was used to collect yellow soil and purple soil with different acidification degrees; analyze the effects of acidification on the composition and properties of soil aggregates; explore the distribution characteristics, occurrence forms, and availability of arsenic (As) in soil aggregates with different acidification degrees; and reveal the key factors restricting the availability of soil As. The results showed that the distribution of total As in each aggregate was positively affected by its mass fraction, and the larger the mass fraction, the more the total As distribution. Soil acidification destroyed the aggregate structure, reduced the mass fraction of large aggregate S1 (>2 mm) by 5 to 15 percentage points, led to the increase in amorphous iron content by 2 to 7 times, and decreased the total As distribution of S1. The available As was positively regulated by non-obligate/obligate adsorptive arsenic (F1, F2) (F1+F2 correlation coefficient 0.76) and negatively affected by residual arsenic (F5) (correlation coefficient -0.89). Soil acidification significantly reduced the ratio of F1 to F2 after exogenous As entered the soil, resulting in a decrease in ω (available As) from 6.71-15.37 mg·kg-1 to 2.36-9.26 mg·kg-1, and the highest exogenous available As content was found in S1 and microaggregate S4 (<0.25 mm). Simultaneously, exogenous available As was also negatively affected by organic matter (correlation coefficient -0.72) and positively regulated by available phosphorus and CEC (coefficients 0.40 and 0.52, respectively). There were differences in soil property factors that restricted the availability of As in aggregates of different particle sizes. Soil acidification in S2 (1-2 mm), S3 (0.25-1 mm), and S4 aggregates significantly increased the amorphous iron and thus reduced the availability of As, and the exogenous available As in S3 was not significantly affected by CEC. However, the effective As from all agglomerated sources was affected by organic matter, nitrogen, and potassium. The results provide a basis for the accurate control of soil As availability and pollution remediation.

[土壤酸化对骨料中砷的分布和可用性的影响]。
采用时空替代法采集不同酸化程度的黄壤和紫色土,分析酸化对土壤团聚体组成和性质的影响,探讨不同酸化程度土壤团聚体中砷的分布特征、赋存形式和有效性,揭示制约土壤砷有效性的关键因素。结果表明:总As在各骨料中的分布受其质量分数的正影响,质量分数越大,总As的分布越多;土壤酸化破坏了团聚体结构,使大团聚体S1 (>2 mm)的质量分数降低了5 ~ 15个百分点,导致无定形铁含量增加了2 ~ 7倍,使S1的总As分布降低。有效砷受非专性/专性吸附砷(F1, F2)正调控(F1+F2相关系数为0.76),受残留砷(F5)负调控(相关系数为-0.89)。土壤酸化显著降低了外源As进入土壤后F1与F2的比值,导致ω(有效As)从6.71 ~ 15.37 mg·kg-1下降到2.36 ~ 9.26 mg·kg-1,其中外源有效As含量最高的是S1和微团聚体S4 (<0.25 mm)。同时,外源速效砷还受有机质负向影响(相关系数为-0.72),受速效磷和CEC正向调节(相关系数分别为0.40和0.52)。不同粒径团聚体中限制砷有效性的土壤性质因子存在差异。S2 (1 ~ 2 mm)、S3 (0.25 ~ 1 mm)和S4团聚体土壤酸化显著增加了无定形铁,从而降低了As的有效性,而CEC对S3中外源有效As的影响不显著。然而,所有团聚源的有效砷均受有机质、氮和钾的影响。研究结果为土壤As有效性的精确控制和污染修复提供了依据。
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
环境科学
环境科学 Environmental Science-Environmental Science (all)
CiteScore
4.40
自引率
0.00%
发文量
15329
期刊介绍:
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信