摘要
文章以鄂东南某钒钛磁铁矿区周边农用地为研究对象,对土壤和水稻糙米重金属含量进行分析和评价。结果表明:研究区内农用地综合质量影响指数平均值为1.5,15.9%点位的土壤受到轻微污染,污染物为V、Cu、Ni、Cd,其中V和Cd分别呈现重度、中度累积;通过主成分分析溯源研究区内重金属污染成因,土壤Cu、Ni、V、Cr、Zn主要来源于钒钛磁铁矿历史开采活动,Pb、Cd来源于化肥农药和畜禽粪便等的施用,As主要受成土母质的影响,Hg来源于周边生活污染源;水稻糙米中重金属含量高低为Cu>Ni>Cr>As>无机As>Cd>Pb>V,其中Cu、Cd、Cr含量超过标准限值,水稻对于V的吸收能力要低于其他重金属;根据剂量-反应关系采用健康评价模型分析,糙米中As、Cu、Cr、Cd的重金属复合危害对该地区人体健康的影响较大,男性的健康风险总体略高于女性,儿童的健康风险高于成人。
Investigation of farmland was carried out in the vicinity of a vanadium-titano magnetite mining area in southeast Hubei Province, which involved the analysis of heavy metals content in the soil and the grown brown rice. As a result, it was shown that the average IICQ of the farmland soil was 1.5, and 15.9% of the soil was categorized as slight pollution, the pollutants in the soil being V, Cu, Ni, Cd, of which V and Cd showed heavy and moderate accumulation, respectively. In addition,the pathway to the source and cause of heavy metal pollution in the study area was studied by the principal component analysis, which concluded that Cu, Ni, V, Cr, and Zn in soil were mainly derived from the historical magnetite ore mining activities;Pb and Cd come from the application of fertilizers, pesticides, livestock and poultry manure;Hg mainly from the domestic pollution of the surrounding area;and As was attributed to soil parent material. The chemical analysis revealed that heavy metals contained in brown rice, the content of which in descending order as Cu>Ni>Cr>As>inorganic As>Cd>Pb>V, and the concentrations of Cu, Cd and Cr exceeded the limit of relevant national standard, thus it could be found the absorption action of paddy rice for V was lower than that of other heavy metals. Furthermore, the health risk assessment which was performed based on the analysis of the dose-response relationship using the health evaluation model showed that brown rice containing As, Cu,Cr, and Cd would in the certain degree cause comprehensive hazards to the local people, and the health risk to male was slightly higher than to female, while the health risk to children was higher than to adults.
作者
张耀
孙刚
王琪
凌海波
黄诗轶
刘针延
ZHANG Yao;SUN Gang;WANG Qi;LING Haibo;HUANG Shiyi;LIU Zhenyan(State Environment Protection,Key Lab of Soil Health Diagnosis and Green Remediation,Hubei Provincial Academy of Ecoenvironmental Sciences(Provinical Ecological Environment Engineering Assessment Center),Wuhan 430072,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2022年第5期217-225,共9页
Environmental Science & Technology
基金
国家重点研发计划项目(2019YFC1804003)。
关键词
钒钛磁铁矿
农用地
水稻
重金属污染
健康风险
vanadium-titano magnetite
farmland
paddy rice
heavy metal pollution
health risks
