硫酸铁复配石灰、水泥对锑矿区周边土壤锑形态分布的影响及生态风险评价  

Effects of Fe_(2)(SO_(4))_(3) combined with solidification agents on the distribution of different antimony forms and ecological risk in antimony-contaminated soil around an antimony mining area

作　　者：保琼莉 刘宗阳 王柯 保万魁[3] 黄益宗 BAO Qiongli;LIU Zongyang;WANG Ke;BAO Wankui;HUANG Yizong(Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affars,Tianjin 300191,China;Tianjin Agricultural University,Tianjin 300384,China;Institute of Agricultural Resource and Regional Planning,CAAS,Beijing 100081,China)

机构地区：[1]农业农村部环境保护科研监测所,天津300191 [2]天津农学院,天津300384 [3]中国农业科学院农业资源与农业区划研究所,北京100081

出　　处：《农业环境科学学报》2022年第8期1730-1738,共9页Journal of Agro-Environment Science

基　　金：国家重点研发计划项目(2020YFC1808702)。

摘　　要：为揭示Fe_(2)(SO_(4))_(3)、石灰及水泥复配处理下锡矿山锑(Sb)污染土壤的Sb形态分布和生态风险,本研究通过室内土壤培养实验,分析了不同复配处理下土壤Sb不同形态含量和pH变化以及生态风险。结果表明:单独添加Fe_(2)(SO_(4))_(3)使土壤水溶态+交换态和碳酸盐结合态Sb分别降低53%~70%和31%~70%;Fe_(2)(SO_(4))_(3)+石灰处理仅使个别样点铁锰氧化物结合态、有机结合态或残渣态Sb含量显著降低。Fe_(2)(SO_(4))_(3)复配水泥处理使水溶态+交换态及碳酸盐结合态Sb含量增加了52%~1264%。单独添加Fe_(2)(SO_(4))_(3)使土壤Sb生物活性降低22%~59%,Fe_(2)(SO_(4))_(3)+石灰处理使Sb生物活性降低15%~51%,降低了多数样点的生态风险,而Fe_(2)(SO_(4))_(3)复配水泥处理使Sb生物活性增加56%~828%,其生态风险等级上升至高或极高。相关分析表明,土壤pH变化显著影响了可利用态Sb(水溶态+交换态)及潜在可利用态Sb(碳酸盐结合态和铁锰氧化物结合态)含量。研究表明,本研究单独添加Fe_(2)(SO_(4))_(3)具有较好的Sb固化-稳定化效果,Fe_(2)(SO_(4))_(3)复配石灰通过提高土壤pH,弱化了对Sb的固化-稳定化,Fe_(2)(SO_(4))_(3)复配水泥会显著提高土壤pH,增加可利用态Sb含量,使Sb迁移性、生物有效性及生态风险增加。In order to understand the effects of Fe_(2)(SO_(4))_(3) combined with lime and cement on the content of different forms of antimony(Sb)and its ecological risk in soils with different pollution degrees in a Sb mining area of an antimony mine,the content of different forms of Sb,pH,and ecological risk in soil treated with different remediation agents through a soil culture experiment were taken into account.The results showed that the addition of Fe_(2)(SO_(4))_(3) alone reduced the contents of soluble+exchangeable and carbonate-bound Sb by 53%~70% and 31%~70%,respectively;Fe_(2)(SO_(4))_(3)+lime treatment only significantly reduced the content of iron-manganese-oxide-bound,organic-bound,or residual Sb in individual sampling sites soils.The treatments of Fe_(2)(SO_(4))_(3) compound cement increased the content of soluble+exchangeable and carbonate-bound Sb by 52%~1264%.Moreover,the addition of Fe_(2)(SO_(4))_(3) alone reduced the biological of Sb by 15%~51% and reduced the ecological risk.However,treatments of Fe_(2)(SO_(4))_(3) compound cement increased the biological activity of Sb by 56%~828%,and its ecological risk increased to a high or extremely high level.Correlation analysis showed that the change of soil pH significantly affected the available Sb(water-soluble+exchangeable)and potential available Sb(carbonate-bound and iron-manganese oxide-bound).Overall,Fe_(2)(SO_(4))_(3) alone showed good effects on Sb solidification stabilization.Fe_(2)(SO_(4))_(3) compound lime weakened the solidification stabilization of Sb by increasing the soil pH compared to the addition of Fe_(2)(SO_(4))_(3) alone,while Fe_(2)(SO_(4))_(3) compound cement significantly increased the soil pH,available-Sb content,and mobility,bioavailability,and ecological risk of Sb.

关 键 词：锑污染 土壤 Fe_(2)(SO_(4))_(3) 石灰 水泥 锑形态分布 生态风险 

分 类 号：X53[环境科学与工程—环境工程] X826