Arsenic species in soil profiles from chemical weapons (CWs) burial sites of China: Contamination characteristics, degradation process and migration mechanism.
Arsenic species in soil profiles from chemical weapons (CWs) burial sites of China: Contamination characteristics, degradation process and migration mechanism.
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DOI：
10.1016/j.chemosphere.2023.140938
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发表时间：
2023-12
期刊：
影响因子：
8.8
通讯作者：
Chao Ji;Yong-bing Zhu;San-ping Zhao;Yan Zhang;Yaguang Nie;Huijun Zhang;Haiyang Zhang;Shiyu Wang-Shiy
中科院分区：
文献类型：
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作者：
Chao Ji;Yong-bing Zhu;San-ping Zhao;Yan Zhang;Yaguang Nie;Huijun Zhang;Haiyang Zhang;Shiyu Wang-Shiy
通过对中国敦化日军遗弃含砷化学武器墓地土壤剖面和孔隙水的分析，了解砷(As)污染的分布、降解和迁移过程。砷形态分析结果表明，含砷试剂的平均降解率为87.55±0.13%，产生无机五价砷(As5+)和有机砷如2-氯乙烯基砷酸(CVAOA)、三苯基砷(TPA)和氧化苯砷(PAO)。有机砷污染物占土壤As的1.27-18.20%。在垂直剖面上，总砷浓度在埋深约40~60 cm处达到峰值，表层农业土壤表现为中到重度污染水平，而在1 cm以下污染水平不明显，反映出整个土壤剖面的迁移相对有限。顺序提取结果表明，As以Fe/Al结合态为主，低结晶Fe矿物吸附了33.23~73.13%的As。对氧气敏感的表层土壤形成了结晶较差的Fe3+矿物，大大减少了砷的向下迁移。然而，减少土壤深度2米以下的氧化条件可能会促进As的活性，需要注意。
In this study, soil profiles and pore water from Japanese abandoned arsenic-containing chemical weapons (CWs) burial sites in Dunhua, China were analyzed to understand the distribution of arsenic (As) contamination, degradation, and migration processes. Results of As species analysis showed that the As-containing agents underwent degradation with an average rate of 87.55 ± 0.13%, producing inorganic pentavalent arsenic (As5+) and organic arsenic such as 2-chlorovinylarsonic acid (CVAOA), triphenylarsenic (TPA), and phenylarsine oxide (PAO). Organic arsenic pollutants accounted for 1.27–18.20% of soil As. In the vertical profiles, total As concentrations peaked at about 40–60 cm burial depth, and the surface agricultural soil exhibited moderate to heavy contamination level, whereas the contamination level was insignificant below 1 m, reflecting As migration was relatively limited throughout the soil profile. Sequential extraction showed Fe/Al-bound As was the predominant fraction, and poorly-crystalline Fe minerals adsorbed 33.23–73.13% of soil As. Oxygen-susceptible surface soil formed poorly-crystalline Fe3+minerals, greatly reducing downward migration of arsenic. However, the reduction of oxidizing conditions below 2 m soil depth may promote As activity and require attention.