阳宗海沉积物中重金属生物有效性评估  

Assessment of bioavailability of heavy metals in sediments of Yangzonghai Lake

作　　者：杨常亮[1] 陈桂明[1] 李世玉[1] 冯文波[2] 邵欢瑜 刘仍兵 刘楷[1] 刘彬[1] 王艳丹[1] 

机构地区：[1]云南大学生态学与环境学院,昆明650091 [2]昆明市环境监测中心,昆明650227 [3]云南大学城市建设与管理学院,昆明650091

出　　处：《环境工程学报》2016年第3期1191-1199,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51168047)

摘　　要：通过测定和分析阳宗海表层沉积物中酸可挥发性硫化物（AVS）和同步提取重金属（SEM）的含量和分布特征,采用SEM/AVS方法对阳宗海表层沉积物中重金属的生物有效性进行评估;同时,采用生物有效阈值法评估了单一重金属的生物有效性。研究得出以下结论：阳宗海表层沉积物中AVS含量为15.09-149.74μmol/g,平均值为49.42μmol/g,从南向北呈递减趋势;AVS在南部和中部均与湖泊水深呈现正相关关系;∑SEM（包括Cu、Cr、Pb、Zn、Mn、As、Cd）含量分布波动较小,其范围为4.84-16.10μmol/g,平均值为10.28μmol/g,其分布规律为北部大于南部;阳宗海各采样点SEM/AVS〈1,说明阳宗海表层沉积物中重金属不会对生物产生不良影响;从单一重金属来看,Pb可能经常产生生物毒性,Cu有可能产生生物毒性,其他金属除部分点可能产生生物毒性外,整体上几乎不会产生生物毒性。Based on the investigation of the contents and distribution of acid volatile sulfide（ AVS） and synchronous extracted metals（ SEM） in surface sediments of Yangzonghai Lake. We assessed the bioavailability of heavy metals in the surface sediments of the lake by using SEM / AVS model. In the meantime,TEL and PEL methods were employed to assess the bioavailability of each single metal. The results showed that： AVS in the surface sediments of the lake ranges from 15. 09 to 149. 74 μmol / g,with the mean of 49. 42 μmol / g,which decreaseds gradually from south to north and shows positive correlation with depth of water in the south and north of the lake respectively. ∑SEM（ include： Cu,Cr,Pb,Zn,Mn,As,Cd） ranges from 4. 84 to 16. 10 μmol / g,with the mean of 10. 28 μmol / g,which has greater value in the north than that in the south,with a small fluctuation. SEM / AVS〈 1 is found at each sample site,implying that there is no bioavailability of heavy metals in the sediment of the lake. In terms of single metal,Pb is more possible and Cu is possible to produce the biological toxicity,the others are next to impossible to produce the biological toxicity.

关 键 词：酸可挥发性硫化物 重金属 阳宗海 生物有效性 同步提取重金属 

分 类 号：X524[环境科学与工程—环境工程]