包头市南部农田污灌区土壤分析及风险评价
Soil assessment and risk evaluation of agricultural sewage irrigation area in south Baotou's urban vicinity
杨宇亮 1段婷 1袁宏伟 1包凤琴 1马志超1
作者信息
- 1. 内蒙古自治区地质调查研究院,内蒙古自治区岩浆活动成矿与找矿重点实验室,内蒙古 呼和浩特 010020
- 折叠
摘要
以内蒙古自治区包头市南部作为主要调研区域,采集 945个表层土壤样本,对样本中的镉(Cd)和铅(Pb)含量展开测定.基于DZ/T 0295-2016《土地质量地球化学评价规范》要求,将研究区分为污染区与非污染区两种情况,并对其中 137份组合样本进一步分析Cd与Pb的赋存状态.研究区土壤中的Cd和Pb平均值分别为 0.38和 151.56 mg/kg.与其他结合态相比,Pb在腐植酸和铁锰氧化物中占据较高比例.潜在生态风险指数法的评估显示,Cd可能带来极强的生态风险,而Pb只会带来轻微的生态风险.根据RAC法,Cd的极强风险 65.69%,高风险 34.31%;Pb中低风险比例达到64.96%,高风险及更高风险 35.04%.综上所述,调查区内的Cd存在的潜在生态风险较高,因此需要对土壤中Cd进行减量化处理;而Pb的潜在生态风险相对较高,同样需要引起足够的重视.
Abstract
Taking south Baotou's urban vicinity,Inner Mongolia as research area,945 surface soil samples were collected to measure total concentrations of cadmium(Cd)and lead(Pb).According to"Determination of Land Quality Geochemical Evaluation"(DZ/T 0295-2016),investigation areas were divided into polluted areas and non-polluted areas,and 137 combined samples were selected to analyze existence state of soil Cd and Pb forms.Results indicated that Cd had an average concentration of 0.38 mg/kg,while Pb was 151.56 mg/kg on average in research soil.Compared with other combinations,binding states of Pb with humic acid and iron manganese oxides were notably stronger.Analysis based on potential ecological risk index indicated that Cd posed a substantial risk while Pb repres-ented a minor risk.Through the RAC method,it was determined that Cd carried an exceptionally high risk in 65.69%,with a signific-ant risk in 34.31%.Proportion of low risk in Pb elements reached 64.96%,and proportion of high risk or above was 35.04%.To sum up,potential ecological risk of Cd in investigation area was the highest,so it was necessary to reduce Cd content in the soil.Potential ecolo-gical risk of Pb was relatively high,and enough attention should be paid to it.
关键词
土壤/镉/铅/包头市/农用地/生态风险/RACKey words
soil/Cd/Pb/Baotou City/agricultural land/ecological risk/RAC引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据