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首页> 外文期刊>Environmental Monitoring and Assessment >Trace metals in aquatic environments of a mangrove ecosystem in Nansha, Guangzhou, South China: pollution status, sources, and ecological risk assessment
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Trace metals in aquatic environments of a mangrove ecosystem in Nansha, Guangzhou, South China: pollution status, sources, and ecological risk assessment

机译：中国广州南沙红树林生态系统水生环境中的痕量金属：污染状况，来源和生态风险评估

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摘要

Mangrove forests are widely located along coastlines. They have been identified to be inimitable and dynamic ecosystems. This study investigated the trace metals in mangrove water and surface sediments of Nansha, Guangzhou, China. Zn (148.42 +/- 247.47 mu g L-1) was the most abundant metal in waters, followed by As (82.34 +/- 118.95 mu g L-1), Pb (22.96 +/- 120.50 mu g L-1), and Ni (19.42 +/- 47.84 mu g L-1). In sediments, the most abundant metal was Fe (27.04 +/- 1.91 g kg(-1)), followed by Mn (1049.04 +/- 364.11 mg kg(-1)), Zn (566.33 +/- 244.37 mg kg(-1)), and Cr (106.9 +/- 28.51 mg kg(-1)). Higher contents of trace metals were detected in vicinity areas of the river mouth. The results of pollution indexes, including contamination factor, enrichment factor, and geo-accumulation index, indicated the pollution of Cd, Cu, Pb, and Zn in sediments. The Spearman correlation and cluster analysis were used to evaluate the metal sources. In water, the significant correlations among Zn and water chemical parameters (Na, Mg, K, Ca, conductivity, pH, and Cl) might indicate the natural source of Zn from the seawater. Water sampling sites in estuaries and coastal areas were clustered separately, which might indicate the influences of upstream water and the seawater, respectively. In sediments, the significant relationships among Cd, Pb, and Zn concentrations were likely to imply the emissions from industries and exploitation of the Pb-Zn mine. The occurrence of Cr and Cu in sediments can be attributed to the spills of lubricants or oil. Cd in sediments could cause serious ecological risk.
机译：红树林遍布沿海地区。他们被确定为独特且动态的生态系统。本研究调查了广州南沙红树林水和表层沉积物中的微量金属。锌（148.42 +/- 247.47μg L-1）是水中最丰富的金属，其次是砷（82.34 +/- 118.95μgL-1），铅（22.96 +/- 120.50μgL-1）和Ni（19.42 +/- 47.84μg L-1）。在沉积物中，最丰富的金属是Fe（27.04 +/- 1.91 g kg（-1）），其次是Mn（1049.04 +/- 364.11 mg kg（-1）），Zn（566.33 +/- 244.37 mg kg（-1））。 -1））和Cr（106.9 +/- 28.51 mg kg（-1））。在河口附近地区发现了更高含量的痕量金属。污染指数（包括污染因子，富集因子和地质累积指数）的结果表明沉积物中Cd，Cu，Pb和Zn受到污染。 Spearman相关性和聚类分析用于评估金属来源。在水中，锌与水化学参数（Na，Mg，K，Ca，电导率，pH和Cl）之间的显着相关性可能表明海水中锌的天然来源。河口和沿海地区的水采样地点分别聚集在一起，这可能分别表明上游水和海水的影响。在沉积物中，Cd，Pb和Zn浓度之间的显着关系可能暗示工业排放和Pb-Zn矿山的开采。沉积物中Cr和Cu的产生可归因于润滑剂或机油的溢出。沉积物中的镉可能引起严重的生态风险。

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