DOI: 10.3724/SP.J.1249.2014.02198

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2014/31:2 PP.198-204

Acid volatile sulfide and simultaneously extracted metals in sediments of Nan'ao Island, a mariculture base in Guangdong coast, China

Surface and core sediments were collected from Baisha Bay, Nan'ao Island, one of Guangdong Province's largest mariculture bases in Southern China. Acid-volatile sulfide(AVS) and simultaneously extracted metals(SEM) including Cd, Pb, Cr, Ni, Cu and Zn were analyzed to evaluate sediment quality. In surface sediments, the contents(dry weight) of AVS and ∑SEM were from 0.04 to 37.62 μmol/g and from 1.54 to 3.82 μmol/g, with average levels of 6.36 and 2.45 μmol/g, respectively. The highest contents of AVS, ∑SEM and molar ratios of AVS to ∑SEM were in fish culture zones. In core sediments, the concentrations(dry weight) of AVS and ∑SEM varied in the range of 0.04-16.27 μmol/g and 1.72-21.14 μmol/g, with average levels of 2.26 μmol/g and 4.71 μmol/g, respectively. The AVS content dramatically increased from bottom to surface sediments in fish culture zone, suggesting that AVS might play a major role in binding heavy metals. On the contrary, the ∑SEM content rapidly decreased from bottom to surface sediments in shellfish culture zone. In the surface sediments, the ration of AVS/∑SEM is larger than 1 in the fish cage, shellfish and seaweed zones, indicating that those heavy metals lightly damaged aquatic organisms.

Key words:marine geochemistry,acid volatile sulfide(AVS),simultaneously extracted metals(SEM),sediments,aquaculture,depth distribution,bioavaibility,Nan'ao Island of Guangdong province

ReleaseDate:2016-04-08 11:02:32

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