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引用本文:李金城,宋进喜,王晓蓉.太湖五里湖区表层沉积物中酸挥发性硫化物和同步提取金属.湖泊科学,2004,16(1):78-81. DOI:10.18307/2004.0112
LI Jincheng,SONG Jinxi,WANG Xiaorong.Acid Volatile Sulfides and Simmltaneous Extracted Metals in the Surficial Sediments of Wuli Lake, Lake Taihu. J. Lake Sci.2004,16(1):78-81. DOI:10.18307/2004.0112
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太湖五里湖区表层沉积物中酸挥发性硫化物和同步提取金属
李金城1, 宋进喜1,2, 王晓蓉1
1.南京大学污染控制与资源化国家重点实验室, 南京 210093;2.西北大学环境科学系, 西安 710069
摘要:
湖泊底泥中的酸溶硫化物易与二价金属生成难溶金属硫化物,从而制约沉积物中二价有毒金属的化学活性以及生物有效性,进而影响沉积物的环境质量.对沉积物中的酸溶硫化物(AVS)和同步提取金属(SEM)进行测定,依据SEM/AVS的比值可以判定重金属生物有效性.通过对太湖五里湖、梅梁湾表层沉积物夏季和秋季AVS与SEM的采样分析,结果表明:研究区域内AVS的含量夏季高于秋季,SEM受季节影响很小,SEM/AVS大于1,且秋季高于夏季,初步判断该湖区沉积物中重金属具有潜在的生物毒性.
关键词:  酸溶硫化物  同步提取金属  底泥  太湖  五里湖
DOI:10.18307/2004.0112
分类号:
基金项目:国家自然科学基金项目(20177007);教育部科技重点项目(03079)
Acid Volatile Sulfides and Simmltaneous Extracted Metals in the Surficial Sediments of Wuli Lake, Lake Taihu
LI Jincheng1, SONG Jinxi1,2, WANG Xiaorong1
1.The State Key Lab of Pollution Control and Resource Reuse, Nanjing 210093, P.R.China;2.Dept.of Environmental Science, Northwest University, Xi'an 710069, P.R.China
Abstract:
Acid volatile sulfides (AVS) in surficial sediments from Wuli lake, Lake Taihu, 2002 are available for binding with divalent cationic metals through the formation of insoluble metal-sulfide complexes, thereby controlling the metal bioavailability and subsequent toxicity to benthic biocommunities.AVS concentrations and simultaneous extracted metals (SEM) values are determined have become the major research topic associated with sediments.The ratio of SEM to AVS is promising to predict metal toxicity.From investigated AVS and SEM during summer and autumn at five locations of Lake Taihu, it was found that SEM-AVS values and AVS concentrations did vary significantly between locations during both seasons.AVS concentrations were greater during summer than spring;SEM concentrations did not significantly vary between seasons at the same location, which resulting in significantly lower SEM-AVS values in summer.SEM-AVS values were greater than one at each location during both seasons illustrated there might exist heavy metals toxicity in Lake Taihu sediments.
Key words:  Acid volatile sulfides  simultaneous extracted metals  sediment  Lake Taihu
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