涠洲岛西面及西南面沉积物重金属污染分析

Analysis of Heavy Metal Pollution in Sediments on the West and Southwest of Weizhou Island

关键词:  重金属  沉积物  涠洲岛  污染评价

Key words:  heavy metal  sediment  Weizhou Island  pollution assessment

摘要:

[目的]研究广西涠洲岛海域沉积物污染情况并进行分析与评价。[方法]通过分析2014年涠洲岛沉积物重金属元素Cu、Pb、Zn、Cd、Cr含量水平,运用单因子评价法、潜在生态风险指数法和地累积指数法进行污染程度评价。[结果]涠洲岛西面及西南面海域沉积物重金属含量均值从小到大依次为Cd < Cu < Pb < Cr < Zn,分别对应未检出、3.02 mg·kg^-1、3.19 mg·kg^-1、6.47 mg·kg^-1、10.10 mg·kg^-1,含量范围分别为未检出、0.95~8.29 mg·kg^-1、2.68~4.07 mg·kg^-1、1.81~18.46 mg·kg^-1、ND~34.59 mg·kg^-1。重金属污染程度属于"低水平",单个及多种重金属生态风险分级均为"轻微",其中Cu是引发生态风险的主要元素,地累积指数亦表明该海域各重金属污染程度均为0级。[结论]总体来说,涠洲岛西面及西南面海域沉积物重金属含量与污染程度较广西沿海其他海域低,仍属清洁水平。

Abstract:

[Objective] This research focuses on the analysis and assessment of sediment pollution in Weizhou Island of Guangxi.[Methods] By analyzing the content of heavy metal elements Cu, Pb, Zn, Cd and Cr in the sediments of Weizhou Island in 2014, the pollution degree was evaluated by single factor evaluation method, potential ecological risk index method and ground accumulation index method.[Results] The average values of heavy metals in the sediments of west and southwest of Weizhou Island were Cd < Cu < Pb < Cr < Zn, respectively, which were not detected, 3.02 mg·kg^-1, 3.19 mg·kg^-1 and 1.46 mg·kg^-1, 10.10 mg·kg^-1, respectively.The range of contents was undetectable, 0.95-8.29 mg·kg^-1, 66.8-4.07 mg·kg^-1, 1.81-18.46 mg·kg^-1, ND-34.59 mg·kg^-1.The degree of heavy metal pollution was "low", and the ecological risk classification of single and multiple heavy metals was "slight".Among them, Cu was the main element inducing ecological risk and the ground accumulation index also exhibited the pollution degree of the heavy metals in this sea area was zero.[Conclusion] On the whole, the content of heavy metal elements in the sediments in the west and southwest of Weizhou Island is lower than other Guangxi coastal area.The sediment in this region is safe and clean to marine organism in terms of heavy metals.