摘要
用XRF法对珠江口12根沉积柱中V,Ni和Co含量进行了分析.V,Ni和Co含量分别在48.97×10-6～180.66 × 10-6,22.12×10-6～72.67×10-6和9.34×10-6～94.42×10-6之间.3种重金属在河口西部和伶仃洋最大混浊带区域含量高,Co同时在河口北部和香港大屿山西岸沉积物中富集.V,Co和Ni在沉积柱中的垂直分布可分为4种类型:均匀分布型、上部富集型、下部富集型和斜“之”字型.它们是各自沉积环境、污染历史以及人类疏浚河口活动的综合反映.相关分析和因子分析显示,Co从水体向沉积物中迁移的机制与V和Ni的迁移机制存在差异.矿物微粒和无机胶体的吸附作用是V,Ni从水体向沉积物中迁移的主要机制,而Co以水解产物形式或硫化物形式进入沉积物中则可能是其在河口的主要迁移机制,地质积累指数法污染评价结果表明,珠江口表层沉积物未受重金属V和Ni污染,Co对1,5,9号站住造成偏轻度污染.
The contents of V, Ni and Co in 12 sediment cores of the Zhujiang Estuary were analyzed by using XRF method. The contents of V, Ni and Co are 48. 97X10 6-180. 66X10-6, 22. 12X10-6-72. 67X10-6, and 9. 34X 10-6-94. 42X10-6, respectively. The contents of three heavy metals are higher in the west side and the zone with maximum turbidity. Co also has a high content in the north part of the estuary and in the west coast of Dayushan in Hongkong. There are four types of sediment profiles of V, Ni. and Co including uniform distribution, top enrichment, bottom enrichment, and complicated distribution. These profile types reflect the cores' sediment environment, pollution history, and the human dredging activity. Correlation analysis and factor analysis indicate that the transfer mechanism of Co from water to sediment is different from that of V and Ni. The adsorption by mineral particles and inorganic colloid particles is the predominant mechanism of Ni, V transfer from water to sediment. The indices of geo-accumulation show that the surface sediments are not polluted by V and Ni and the surface sediments of 1,5, 9 stations are lightly polluted by Co.
出处
《浙江大学学报（理学版）》
CAS
CSCD
2003年第1期103-108,共6页
Journal of Zhejiang University（Science Edition）
基金
973基金资助项目(G20O007850)
香港科技大学珠江河口污染计划资助项目
