汕头南澳海水养殖区不同水层重金属的分布和环境质量评价

利用电感耦合等离子发射光谱(ICP-AES)方法测定了汕头南澳海水养殖区溶解态的重金属在不同水层中的分布.在龙须菜、鱼类和贝类养殖水域检出Fe、Zn、Mn、Pb等重金属,其中微表层(SML)和底层(BW)是这些重金属的主要存在区域.这些重金属在微表层(SML)中的浓度(Fe 27.5-286.5 μg/L,Zn13.5...

Heavy metal distribution patterns and environmental quality assessment of the mariculture areas in Nanao, Shantou

The Fe, Zn, Mn and Pb concentrations in the seawater dissolved phase were investigated in the sea-surface microlayer (SML), subsurface water (SSW) and bottom water (BW) samples collected at of three mariculture areas of the Nanao Island ocean zone. The results showed that the SML and the BW were important compartments for these heavy metals in the madculture areas and the concentrations varied from 23.0 μg/L to 268.0 μg/L(Fe), 11.0 μg/L to 82.2 μg/L(Zn), 1.5 μg/L to 11.0 μg/L(Mn) and 6.0 μg/L to 40.5 μg/L(Pb) in SSW, while a clear enrichment is observed in the SML, where these ranged from 27.5 μg/L to 286.5 μg/L(Fe), 13.5 μg/L to 89.0 μg/L(Zn), 3.0 μg/L to 12.0 μg/L(Mn) and 7.0 μg/L to 46.0 μg/L(Pb). The enrichment factors were in the range of 1.07 - 1.39 which showed a slight enrichment. The average enrichment factors of Fe, Zn, Pb and Mn were 1.18, 1.13, 1.12 and 1.30, respectively. The average enrichment factors in shellfish, fish and gracilada lemaneaformis farming areas were 1.26, 1.19 and 1.11, respectively, which showed that the surface activity was highest in the shellfish farming area. Furthermore, the heavy metals concentrations were lowest in the gracilaria lemaneaformis farming area. The results of single factor contamination index showed that the investigated areas were slightly contaminated with Zn, while the partial farming areas were seriously contaminated with Pd during a certain period of time.