如东滩涂近岸海域沉积物重金属分布特征及风险评价

周超凡<sup>1; 2</sup>; 矫新明<sup>1; 2</sup>; 董冰洁<sup>1; 2</sup>; 张晓昱<sup>1; 2</sup>; 吕赢<sup>1; 2</sup>等

引用本文:	ZHOU Chao-fan, JIAO Xin-ming, DONG Bing-jie, ZHANG Xiao-yu, LV Yinget,al.Distributions and Ecological Risk Assessment of Heavy Metals in Sediments of the Tidal Flat Coastal Areas in Rudong[J].Environmental Monitoring and Forewarning,2022,14(2):25~31

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如东滩涂近岸海域沉积物重金属分布特征及风险评价
周超凡,矫新明,董冰洁,张晓昱,吕赢等^1,2
1.江苏省环境监测中心，江苏南京 210019;2.江苏省海洋环境监测预报中心，江苏南京 210019

摘要:

基于2017和2019年如东滩涂近岸海域沉积物重金属调查数据，探讨该海域沉积物重金属的分布特征，通过重金属与环境因子的相关性分析，研究影响重金属分布的控制因素。采用地累积指数法和潜在生态风险指数法评估其污染程度和潜在生态风险。结果表明，铜（Cu）、锌（Zn）、铅（Pb）、铬（Cr）、镉（Cd）、汞（Hg）、砷（As）平均质量分数分别为9.42，51.3，15.2，55.6，0.09，0.006和7.71 mg/kg。整体来看，Cu、Zn、Pb、Cr、Cd、Hg的高值区主要分布在河口邻近海域。Cu、Pb、Cd、Zn、Hg、Cr的来源可能高度相似，有机碳与粒度是其分布的主要控制因素，As的来源与分布则比较特殊。7种重金属的潜在生态风险指数排序为：Cd＞Hg＞As＞Pb＞Cu＞Cr＞Zn，其中Cd是主要的生态危害因子。

关键词: 近岸海域沉积物重金属分布特征生态风险如东

DOI：

分类号:X82

基金项目:江苏省环境监测科研基金资助项目（2119，2001）；江苏省生态环境科研课题基金资助项目（2019005，2020010，2020009）

Distributions and Ecological Risk Assessment of Heavy Metals in Sediments of the Tidal Flat Coastal Areas in Rudong

ZHOU Chao-fan, JIAO Xin-ming, DONG Bing-jie, ZHANG Xiao-yu, LV Yinget,al^1,2

1.Jiangsu Provincial Environmental Monitoring Center, Nanjing, Jiangsu 210019, China;2. Jiangsu Marine Environmental Monitoring Forecasting Center, Nanjing, Jiangsu 210019, China

Abstract:

Based on the survey data of heavy metals in the sediments of the tidal flat coastal areas in Rudong City in 2017 and 2019, the distribution characteristics of heavy metals in the sediments were studied. By analyzing the relationships between heavy metals and environmental factors, the controlling factors that affect the distribution of heavy metals were discussed. The pollution characteristics and the ecological risk were evaluated by the geo accumulation index method and Hakanson potential ecological risk index method. The results showed that the average concentrations of Cu, Zn, Pb, Cr, Cd, Hg and As were 9.42, 51.3, 15.2,55.6,0.09, 0.006 and 7.71 mg/kg, respectively. The concentrations of Cu, Zn, Pb, Cr, Cd and Hg were higher around the estuary and its adjacent areas. The main sources of Cu ,Pb, Cd, Zn, Hg and Cr may be highly similar. The total organic carbon and grain size of sediments were important factors for the distributions of heavy metals except for As. The potential ecological risk levels were Cd＞Hg＞As＞Pb＞Cu＞Cr＞Zn, and Cd contributed the most.

Key words: Tidal flat coastal areas Sediment Heavy metals Distribution characteristics Ecological Risk Rudong