岩溶区典型石灰土Cd形态指示意义及风险评价——以桂林毛村为例

发布时间：2018-03-27 20:24

本文选题：石灰土　切入点：镉　出处：《吉林大学学报(地球科学版)》2016年02期

【摘要】：为了了解岩溶区石灰土中重金属Cd形态分配特征及富集情况,在桂林毛村采集了3种处于不同发育阶段的黑色、棕色和红色石灰土进行研究。通过原子光谱仪测试了Cd质量分数,运用改进的Tessier分析法测定了3种石灰土中Cd的可交换态(EXC)、碳酸盐结合态(CAB)、铁锰氧化物结合态(OXI)、有机结合态(ORG)、残渣态(RES)5种形态,并对其指示意义及风险进行了分析与评价,结果表明,3种石灰土中Cd质量分数从大到小依次为早期黑色石灰土、中期棕色石灰土、晚期红色石灰土。形态测试结果表明:黑色石灰土和棕色石灰土中Cd形态以铁锰氧化态和残渣态为主,占土壤Cd质量分数的63%以上,且5种形态质量分数从大到小顺序均为铁锰氧化态、残渣态、可交换态、碳酸盐结合态、有机结合态;红色石灰土Cd形态以残渣态为主,占土壤Cd质量分数的76%,形态分配特征从大到小为残渣态、铁锰氧化态、可交换态、碳酸盐结合态、有机结合态。Cd稳定度和富集程度评价结果表明:在黑色石灰土、棕色石灰土和红色石灰土中Cd稳定度逐渐减小,环境二次释放风险逐渐降低;富集程度从大到小依次为黑色石灰土、棕色石灰土、红色石灰土,其中Cd在黑色石灰土中呈显著富集状态,在棕色石灰土中呈中度富集状态,在红色石灰土中呈轻微富集状态。潜在生态风险评价和健康风险评价结果表明,由早期黑色石灰土到中期棕色石灰土和晚期红色石灰土,土壤中Cd的生态风险和健康风险均逐渐降低。研究结果可为岩溶区土壤重金属Cd污染修复与治理提供基础数据。
[Abstract]:In order to understand the speciation and accumulation of heavy metal CD in calcareous soil in karst area, three kinds of black in different developmental stages were collected in Guilin Mao village. The mass fraction of CD was measured by atomic spectrometer. By using the improved Tessier analysis method, the exchangeable forms of CD in three kinds of lime soils were determined, such as Exco, CABX, OXI, ORGN and RESN, and their indicative significance and risk were analyzed and evaluated. The results showed that the mass fraction of CD in the three kinds of lime soils was black lime soil in the early stage and brown lime soil in the middle period. The results showed that the forms of CD in black lime soil and brown lime soil were mainly ferromanganese oxidation and residue, which accounted for more than 63% of CD content in soil. The mass fractions of 5 kinds of forms are iron-manganese oxidized, residual, exchangeable, carbonate bound, organic bound, red lime soil CD form is mainly residue state, and the order of mass fraction of five forms from large to small is iron-manganese oxidation state, residue state, exchangeable state, carbonate bound state, organic bound state. The fraction of CD in the soil was 76%, the speciation distribution characteristics were from large to small residual state, iron and manganese oxide state, exchangeable state, carbonate bound state, organic bound state. CD stability and enrichment degree. The results showed that: in black lime soil, the content of CD in black lime soil was higher than that in black lime soil. The stability of CD in brown lime soil and red lime soil decreased gradually, and the risk of environmental secondary release gradually decreased, and the enrichment degree was black lime soil, brown lime soil and red lime soil, and the enrichment degree was black lime soil, brown lime soil and red lime soil. CD was significantly enriched in black lime soil, moderately enriched in brown lime soil and slightly enriched in red lime soil. The results of potential ecological risk assessment and health risk assessment showed that CD was significantly enriched in black lime soil, moderately enriched in brown lime soil and slightly enriched in red lime soil. From early black lime soil to middle brown lime soil and late red lime soil, the ecological risk and health risk of CD in soil gradually decreased. The results can provide basic data for remediation and remediation of CD pollution in karst soil.
【作者单位】：中国地质科学院岩溶地质研究所/国土资源部岩溶动力学重点实验室/岩溶生态系统与石漠化治理重点实验室;
【基金】：国土资源部地质调查项目(1212011121166,121237131301101,2002371120029,1212011220959) 国家重点基础研究发展计划(国家“973”计划)项目(2011CB201001) 中国地质科学院岩溶地质研究所基本科研业务费项目(2014030,2015016)~~
【分类号】：X53;X826

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