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对长江口吴淞-浏河滨岸带37个站位沉积物中酸可挥发性硫化物(AVS)和同时可提取态重金属(SEM)含量及其空间分布特征进行了研究。结果表明,SEM在37个站位沉积物中浓度范围为0.20～1.37μmol/g,平均值为0.74μmol/g;AVS的浓度范围为0.20～0.80μmol/g,平均值为0.23μmol/g;沉积物中AVS含量与总有机碳(TOC)和含水率呈显著正相关关系,而SEM分别与TOC和含水率呈显著正相关关系,与沉积物中值粒径呈显著负相关关系。依据SEM/AVS比值评价方法以及美国EPA(SEM-AVS)差值评价方法对沉积物中重金属的生物有效性的判断表明,除了B2站点无显著生物毒性外,吴淞-浏河滨岸带沉积物中重金属对水生生物均处于中等毒性水平。
The contents of acid volatile sulfide (AVS), simultaneous extractable heavy metals (SEM) and their spatial distribution in 37 stations in the Wusong-Liuhe River bank of the Yangtze Estuary were studied. The results showed that the concentration of SEM in the sediments of 37 stations ranged from 0.20 to 1.37 μmol / g with an average of 0.74 μmol / g and the concentration of AVS ranged from 0.20 to 0.80 μmol / g with an average of 0.23 μmol / g. There was a significant positive correlation between AVS content and total organic carbon (TOC) and water content in sediments, while SEM had a significant positive correlation with TOC and water content, respectively, and negatively correlated with sediment median grain size. The evaluation of the bioavailability of heavy metals in sediments based on the SEM / AVS ratio method and the difference evaluation method of the US EPA (SEM-AVS) showed that except for the no significant bio-toxicity at the B2 site, the Wusong-Liuhe bank sediments Medium and heavy metals are moderately toxic to aquatic organisms.