西南农业学报2025，Vol.38Issue(7)：1391-1403,13.DOI:10.16213/j.cnki.scjas.2025.7.005
海南岛西部矿区周边农用地土壤镉铅砷分布特征及风险评估
Distribution characteristics and risk assessment of cadmium,lead and arsenic in agricultural soil around the western mining area of Hainan Island
摘要
Abstract
[Objective]There is an urgent need to conduct concentration analyses of cadmium(Cd),lead(Pb),nd arsenic(As)in the soil of agricultural land surrounding the western mining area of Hainan Island,to explore pollution characteristics,assess health risks,and estab-lish a systematic research framework.[Method]A total of 807 topsoil(0-20 cm)samples were collected from the study area,and the con-centrations of Cd,Pb and As,along with soil pH and organic matter content,were determined.Based on the distribution of rivers within the study area,the study area divided into four small watersheds.A comprehensive evaluation was conducted using the single factor pollution in-dex method,nemerow pollution index,geo-chemical accumulation index,potential ecological risk factor and human health risk assessment to analyze pollution characteristics and risks of soil Cd,Pb and As.[Result]The soil in the study area was acidic with a relatively low organic matter content.The proportion of sampling points exceeding background values for Cd,Pb and As was 83.52％,62.83％and 1.61％,re-spectively.A highly significant correlation was observed between Cd and Pb concentrations.The single factor pollution index indicated that 97.52％,97.03％and 100.00％of the sampling points were classified as unpolluted for Cd,Pb and As,respectively.The results of nemerow pollution index showed that basins A and C were moderately polluted,basin B was lightly polluted,and basin D was heavily polluted due to individual points exceeding the standard.The geo-chemical accumulation index showed that 27.63％and 5.33％of the sampling points ex-hibited at least mild contamination for Cd and Pb,respectively.The potential ecological risk factor results indicated that the ecological risk in the study area was relatively controllable,with strong risk in watershed A accounting for 33.58％.There were local ecological high-risk points,and the main potential ecological hazard element was Cd.Human health risk assessment results indicated that Cd and Pb posed no sig-nificant health risks,while the carcinogenic risk of As remained within the acceptable threshold.[Conclusion]Certain sampling points in the study area exhibit elevated Cd and Pb concentrations with associated ecological risks,whereas As levels are low and considered safe.Among different river basins,there are significant differences in the pollution risk levels of the three heavy metals,necessitating element-specific and watershed-based management and remediation strategies.It is necessary to focus on controlling the distribution areas of Cd high-risk points and local Pb heavy pollution points in watershed A and D.关键词
热带/土壤污染/重金属/环境健康/安全利用Key words
Tropics/Soil pollution/Heavy metals/Environmental health/Safe utilization分类
农业科技引用本文复制引用
蓝才鑫,陈华毅,赵晓阳,胡小飞..海南岛西部矿区周边农用地土壤镉铅砷分布特征及风险评估[J].西南农业学报,2025,38(7):1391-1403,13.基金项目
海南省自然科学基金项目(725RC842) （725RC842）
