Distribution of AVS-SEM, transformation mechanism and risk assessment of heavy metals in the Nanhai Lake in China |
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| Authors: | Jiang He Changwei Lü Qingyun Fan Hongxi Xue and Jinhua Bao |
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| Institution: | (1) College of Environment and Resources, Inner Mongolia University, Hohhot, 010021, Inner Mongolia, China |
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| Abstract: | Distribution of AVS (acid volatile sulfide)-SEM (simultaneously extracted metals), transformation mechanism and risk assessment
of heavy metals in the Nanhai Lake in Baotou City were discussed in this work. The results showed that the content of heavy
metals in sediments increased due to the water pumped from the Yellow River, domestic sewage, municipal runoff and yacht waste
release. Increasing water depth, domestic sewage influx and hydrophyte booming made the AVS level higher in downstream than
upstream. The vertical distribution of AVS is characterized as multiple-peak in the sediment cores from the studied lake.
Comparatively, the control abilities of the carbonate and sulfate to the heavy metals were five orders of magnitude lower
than the sulfide phase. Therefore, AVS was the key factor controlling the precipitation of heavy metals in the Nanhai Lake.
The ratio of SEM/AVS in the sediments, the acute sediment quality criteria and the chronic sediment quality criteria indicated
that no acute toxicity for benthic organisms can be expected, and the AVS plays an important role in controlling the bioavailability
and toxicity of heavy metals in the Nanhai Lake. |
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