作　　者： ; ; ; ;

机构地区： 广东海洋大学

出　　处： 《海洋通报》 2009年第3期37-44,共8页

摘　　要： 对胶州湾李村河口9个短柱状样沉积物中活性金属、AVS和有机质含量等参数进行了分析。其中AVS含量:198.4～0.4μmol/g,平均35.8μmol/g。大部分样品活性金属含量具有Fe>Zn>Cu>Cr>V>Ni>Pb>Co>Cd的顺序。活性重金属Zn,Cu,Cr,V,Ni,Pb,Co,Cd含量之和(ΣM)为:0.53～17.39μmol/g。通过对所测数据分析发现,大多数活性金属间具有较好的相关性,反映了它们具有相同的来源或相似的早期成岩地球化学特征。近河口区沉积物的地球化学特征与远河口区差异明显:近河口区底层水为还原环境,AVS形成的制约因素是活性铁的可获得性,而活性重金属的分布受到AVS的控制并主要以金属硫化物或硫化物吸附态的形式存在,AVS仍具有较大的吸附重金属的潜力,同时硫化物中重金属再次释放造成二次污染的潜在性也较大;而在离河口稍远的海域,沉积物中AVS形成的控制因素是有机质的供给和环境氧化还原状态的变化,活性重金属主要以铁氧化物结合态存在,表层沉积物中重金属的环境敏感性及生物有效性都较高。 The reactive metals, AVS, and organic carbon, etc, were analyzed in 9 short column sediment cores from the Licun estuary in the Jiaozhou Bay. The results shows that the AVS varies in a broad range as 198.4 μmol/g - 0.4μmol/g with an average value as 35.8 μmol/g. In most samples, the content of reactive metals has the sequence as follows Fe〉 Zn〉 Cu〉 Cr〉V〉Ni〉 Pb 〉 Co〉Cd. Sum of reactive heavy metals （ YM ） including Zn, Cu, Cr, V, Ni, Pb, Co, Cd is 0.53μmol/g - 17.39 μmol/g. Good relativities between those reactive heavy meals are found in most cores. It indicates that these heavy metals have the same origin or similar early diagnosis geochemical character. The sediments present different geochemical characters obviously between estuary nearby area and estuary distant area. In estuary nearby area, bottom sea water is in a reducing environment, and the control factor of AVS formation is the availability of reactive iron. The reactive heavy metals distribution is controlled by AVS and exists as form as metal sulfides or sulfide adsorption in the sediment. AVS have large potential of heavy metal adsorption, and the possibility of secondary pollution of heavy metal released from sulfide decomposition is large at the same time. In estuary distant area, the control factor of AVS formation is the supply of organic carbon and redox state of environment. Reactive heavy metals exist mainly as iron oxide combination in the sediments, and their environment sensitivity and biology validity are relative high in the surface sediments.

关 键 词： 胶州湾 李村河口 活性金属 酸可溶硫化物

领　　域： [天文地球] [天文地球] [环境科学与工程]