Geochemical Assessment and Spatial Analysis of Heavy Metals in the Surface Sediments in the Eastern Beibu Gulf: A Reflection on the Industrial Development of the South China Coast.
Geochemical Assessment and Spatial Analysis of Heavy Metals in the Surface Sediments in the Eastern Beibu Gulf: A Reflection on the Industrial Development of the South China Coast.
复制标题
北部湾东部表层沉积物重金属地球化学评价与空间分析：对华南沿海工业发展的思考
DOI：
10.3390/ijerph15030496
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发表时间：
2018-03-12
影响因子：
--
通讯作者：
Cai M
中科院分区：
文献类型：
--
作者：
Chen F;Lin J;Qian B;Wu Z;Huang P;Chen K;Li T;Cai M
北部湾（又称北部湾）位于南海西北部，是因快速工业化和城市化而遭受湍流和污染的海湾的代表。在这项研究中，我们的目标是为研究领域提供重金属的新基线水平。对北部湾东部35个地点的表层沉积物中5种重金属（即铜、铅、锌、镉和铬）的浓度进行了测定。重金属含量分别为：Cu 6.72~25.95 mg/kg、Pb 16.99~57.98 mg/kg、Zn 73.15~112.25 mg/kg、Cd 0.03~0.12 mg/kg、Cr 20.69~56.47 mg/kg。就中国沉积物质量标准而言，北部湾东部沉积物并未受到沿海金属污染的显着影响。由地累积指数（Igeo）推算结果表明，研究区存在轻度Pb污染，可能是面源污染。 Cu、Pb、Cd 浓度较高的区域为广西沿海、雷州半岛和海南岛西北海岸，Zn、Cr 浓度最高的区域为海南岛西北海岸。重金属的空间分布模式表明，Pb的生物可利用部分高于残留部分，而可交换部分和碳酸盐部分中的Cu和Cd浓度相对高于生物可利用部分。层次聚类分析表明，采样站可以分为具有不同地理分布的三组。伴随着研究区空间分布的相似性，Cu、Cd、Pb之间也存在显着的相关系数，表明这三种金属可能具有相似的来源。总体而言，结果表明北部湾表层沉积物中这些重金属的分布较为复杂。
The Beibu Gulf (also named the Gulf of Tonkin), located in the northwest of the South China Sea, is representative of a bay suffering from turbulence and contamination associated with rapid industrialization and urbanization. In this study, we aim to provide the novel baseline levels of heavy metals for the research area. Concentrations of five heavy metals (i.e., Cu, Pb, Zn, Cd and Cr) were determined in surface sediments from 35 sites in the eastern Beibu Gulf. The heavy metal content varied from 6.72 to 25.95 mg/kg for Cu, 16.99 to 57.98 mg/kg for Pb, 73.15 to 112.25 mg/kg for Zn, 0.03 to 0.12 mg/kg for Cd, and 20.69 to 56.47 mg/kg for Cr, respectively. With respect to the Chinese sediment quality criteria, sediments in the eastern Beibu Gulf have not been significantly affected by coastal metal pollutions. The results deduced from the geoaccumulation index (Igeo) showed that the study area has been slightly polluted by Pb, which might be caused by non-point sources. Relatively high concentrations of Cu, Pb and Cd were found around the coastal areas of Guangxi province, the Leizhou Peninsula and the northwest coast of Hainan Island, whereas the highest concentrations of Zn and Cr were found on the northwest coast of Hainan Island. Spatial distribution patterns of the heavy metals showed that bioavailable fractions of Pb were higher than in the residual fractions, while Cu and Cd concentrations in exchangeable and carbonate fractions were relatively higher than those in the bioavailable fractions. Hierarchical clustering analysis suggested that the sampling stations could be separated into three groups with different geographical distributions. Accompanying their similar spatial distribution in the study area, significant correlation coefficients among Cu, Cd and Pb were also found, indicating that these three metals might have had similar sources. Overall, the results indicated that the distribution of these heavy metals in the surface sediments collected from the Beibu Gulf was complex.
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