品清湖沉积物酸可挥发性硫化物与重金属生物毒效性研究

Acid Volatile Sulfides and Biotoxicity of Heavy Metals in Sediments From the Pinqing Lake

测定了广东汕尾品清湖海域7个站位表层沉积物样品的酸可挥发性硫化物(AVS)和同步浸提重金属(SEM)质量摩尔浓度,对AVS、SEM及其比值以及分布进行了分析。结果表明,该海域表层沉积物AVS质量摩尔浓度范围为0.315～1.635μmol.g-1;SEM质量摩尔浓度分布范围为1.332～2.424μmol.g-1。通过分析,品清湖表层沉积物中Cu和Pb的生物有效性较高,对底栖生物存在潜在的毒性效应,其它单个重金属不会对底栖生物产生毒性效应。

Acid volatile sulfides（AVS）,simultaneously extracted metals（SEM） and AVS/SEM ratios（molarratios） in 7 surface sediment samples collected from the Pinqing Lake were determined and their distributions were studied.The results show that the contents of AVS in the surface sediments in the studied area range from 0.315 to 1.635 μmol·g-1 and those of SEM from 1.332 to 2.424 μmol·g-1.The AVS/SEM ratios range from 0.152 to 1.226.It can be inferred from these data that the heavy metals in the surface sediments of the Pinqing Lake may potentially pose toxicity to the aquatic organisms.Besides,Pb and Cu,but not other single heavy metals,in the surface sediments of the Pinqing Lake have high biological effectiveness and may also exert potential toxic effects to the benthic organisms.This study is of important guidance in dredging and remediating the lake.