柘林湾表层沉积物重金属分布及污染初步评价

A primary study on the distribution and pollution of heavy metals in the surficial sediments of Zhelin Bay

研究了柘林湾表层沉积物样品中7种重金属元素的质量分数及分布特征,并对其来源进行了分析。结果显示,调查海区Zn的平均质量分数为113.0μg/g±6.5μg/g、Cr为40.1μg/g±8.5μg/g、Mn为837.9μg/g±168.6μg/g、Cu为24.0μg/g±4.3μg/g、Pb为57.7μg/g±11.3μg/g、Ni为24.4μg/g±5.7μg/g、Fe为3.7%±0.4%。重金属主要来源于陆源风化产物,其质量分数反映了粤东地区的地质特点。分别以沉积物质量和香港环保署公布的标准,对柘林湾表层沉积物重金属污染进行了评估,结果表明:只有Pb在部分站位达到中度污染水平,其它重金属元素则只为轻度污染。

In present study, The contents of 7 kinds of heavy metals （Fe, Mn, Cu, Pb, Zn, Co, Ni） in surficial sediments of Zhelin Bay were determined, and their distribution and main resources were analyzed. The results showed that the mean contents of the heavy metals were： Zn11.3μg/g±6.5μg/g; Cr 40.1μg/g±8.5μg/g; Mn 837.9μg/g±168.6μg/g; Cu 24.0μg/g± 4.3 μg/g; Pb 57.7μg/g±11.3 μg/g; Ni 24.4μg/g± 5.7μg/g; Fe 3.7% ±0.4 %. The main resources of heavy metals are from terrestrial weathering products and their contents reflected the ubiquitous geochemical characteristic of eastern Guangdong province. The pollution degree of heavy metals in surface sediment of Zhelin Bay was assessed, according to the criterion of marine sediment quality and the criterion of Hong Kong Environmental Protection Department, the result showed that the contents of Pb in a few stations made middle pollution, the other heavy metals made only slightly pollution in whole studied area.