湄洲岛码头沿岸表层沉积物重金属污染特征及来源解析
首发时间:2020-02-04
摘要:为探讨湄洲湾港务及航运活动对近海环境重金属分布的影响及污染特征,本文在湄洲岛选择了三个污染源相对单一的码头作为研究对象,通过分析其表层沉积物的粒度特征、重金属元素(Cr、Co、Ni、Cu、Cd、Pb)含量,探讨码头沿岸表层沉积物的重金属元素空间分布特征、影响因素及其物质来源。研究结果表明,该区域沉积物中重金属元素分布受粒度的影响显著,在细粒径物质占比较大的码头避风港内侧沉积物中含量较高,其中Cd为该区域的主要生态风险因子。港务及航运活动造成大量重金属元素的普遍富集,并主要体现在Cu和Pb上,除此之外,地壳自然风化及农业生活污水的排放也是该区域重金属元素的重要污染来源。
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Pollution Characteristics and Source Analysis of Heavy Metals in Surface Sediments Along Meizhou Island Wharf
Abstract:To explore the influence of Meizhou Bay port and shipping activities on the distribution of heavy metals and pollution characteristics in the offshore environment, three wharfs with relatively single pollution sources in Meizhou Island were selected as the research objects. By analyzing the grain size characteristics and the content of heavy metals(Cr, Co, Ni, Cu, Cd, Pb) in the surface sediment, the spatial distribution characteristics, influencing factors and material sourPollution Characteristics and Source Analysis of Heavy Metals in Surface Sediments Along Meizhou Island Wharfces in the surface sediments along the wharfs was discussed. The results show that the distribution of heavy metal elements in the sediments in this area is significantly affected by the particle size, and the contents are higher in the sediments from the inner harbor of wharf where the fine-grained material accounts for a larger proportion, and Cd was the main ecological risk factor in this area. Port and shipping activities have caused widespread enrichment of a large number of heavy metal elements, which are mainly reflected in Cu and Pb. In addition, natural weathering of the crust and discharge of agricultural and domestic sewage are also important sources of heavy metal pollution in the region.
Keywords: heavy metal pollution Meizhou Bay wharf surface sediment source
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