摘要
采用原子吸收方法分析了广东蕉岭长潭水库表层沉积物重金属(Cu、Pb、Zn、Cr、Ni、Cd、As、Hg)含量水平,以广东省红壤重金属环境背景值和我国《土壤环境质量标准》Ⅰ级自然背景值为参比标准,采用地积累指数和H覽kanson潜在生态危害指数法对长潭水库表层沉积物重金属污染特征及其生态风险进行评价。结果表明,长潭水库表层沉积物重金属污染较轻,Cu、Pb、Zn、Cr、Ni、As和Hg平均含量分别为55.7、65.1、280.9、30.7、16.2、10.9mg·kg-1和0.05mg·kg-1,Cd在所有沉积物中未检出。重金属地积累指数和潜在生态风险指数评价结果显示,长潭水库处于无污染至中度污染范畴,具有轻微潜在生态风险。工农业生产、生活污水排放及旅游观光等人为活动及自然因素是长潭水库重金属污染的重要来源。对库区上游的农业面源污染应引起相关部门重视。
The concentrations of heavy naetals（Ca, Pb, Zn, Cr, Ni, Cd, As and Hg） in eight surface sediment samples from Changtan Reservoir, Guangdong Province were analyzed by using atomic absorption spectroscopy. Pollution characteristics of heavy metals were observed on the basis of background values of heavy metals in red soil of Guangdong Province and Grade Ⅰ values of the National Standard of Soil Environmental Quality. Potential ecological risk assessment was evaluated by using the geoaccumulation index（Igeo） and potential ecological risk index（Rl）. The results indicated that the sediments from Changtan Reservoir had been slightly contaminated by heavy metals. The average concentrations of Cu, Pb, Zn, Cr, Ni, As and Hg in surface sediments from Changtan Reservoir were 55.7 mg·kg^-1, 65.1 mg·kg^-1, 280.9 mg· kg^-1, 30.7 mg·kg^-1, 16.2 mg·kg^-1, 10.9 mg·kg^-1 and 0.05 mg·kg^-1, respectively. Cd was not detected in all samples. According to the geoaccu- naulation index, the pollution degree of heavy metals in surface sediment from Changtan Reservoir ranged from zero pollution to moderate degree. The potential ecological risk of heavy metals was slight degree. Natural factors and anthropogenic activities contributed to potential sources of heavy metals in Changtan Reservoir, which included industrial and agricultural activities, untreated sewage discharge, and tourism activities. Environmental management should pay attention to the surface source pollution in the upstream of Changtan Reservoir.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2011年第6期1166-1171,共6页
Journal of Agro-Environment Science
基金
中央级公益性科研院所专项资金项目(zx_200910_26)
国家水体污染控制与治理科技重大专项(2009ZX07527-005)
关键词
重金属
污染特征
生态风险评价
沉积物
长潭水库
heavy metals
pollution characteristics
ecological risk assessment
sediment
Changtan Reservoir
