The Role of Acid-Volatile Sulfide for Toxicity of Heavy Metals in
Sediment of Rivers in Hong Kong
JIA Zhenbang, LIANG Tao
(The Urban and Environmental Science Department of Peking University,
Beijing, 100871)
LAM Kinche, LIU Fengwei
(The Geography Department of Chinese University of Hong Kong, Hong Kong,
N.T., Shatin)
- Abstract:
- The contents of heavy metals in sediment are decided by lots of factors
such as pH, Eh, TOC, Fe-Mn oxide etc. And their toxicity are up to their
forms, bioavailability and environmental features. It is well know that
heavy metals can form sulfides that are not soluble in water, but we are
not quite clear with acid-volatile sulfide (AVS) can also form sulfides
with the heavy metals. AVS plays an important role on mediating the
toxicity of the heavy metals in sediment. We assessed the pollution of
heavy metals in the main rivers of Hong Kong based on the molar ratio
of Simultaneous Extract Metals (SEM) and AVS. This method is helpful on
predicting the toxicity of heavy metals.
- Key words:
- Hong Kong; sediment; heavy metals; toxicity; AVS; SEM
(R.D.1997-06-06 P.D.1998-04-20 Vol.34 No.2 pp.379-386)
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