摘要
本研究2010年和2019年在大亚湾西北部分别开展了10个和15个表层沉积物站位调查,探讨了大亚湾表层沉积环境要素时空分布、历史演变与影响因素.结果表明,2010年Cu、Pb、Zn、Cd、Cr、Hg、As和有机碳的均值分别为32.8、41.3、120.4、0.27、40.0、0.044、8.10 mg·kg^(-1)和1.04%,澳头近岸的C01、C02站位Cu、Zn、Cd以及沙鱼洲附近C06、C07站位Cu含量超出沉积物一类质量标准,但均满足二类质量标准;2019年的均值分别为22.1、35.3、97.2、0.06、41.2、0.046、8.14 mg·kg^(-1)和1.17%,白寿湾的E10站位Cu超出一类质量标准,但均满足二类质量标准.综合两次调查结果分析,大亚湾西北部表层沉积物各项要素空间分布为澳头、哑铃湾、白寿湾、沙鱼洲、宝塔洲以南坪峙岛以西海域高,中央列岛低的趋势.2017年以来大亚湾一系列环境整治行动对大亚湾沉积物大部分要素浓度影响不显著,仅Cd含量显著降低.通过对2010与2019年相近站位对比分析,RI值变化不显著,即大亚湾西北部总体潜在生态风险变化不大,大亚湾西北部总体上目前仍处于高等—很高风险水平,主要风险污染物为Hg和Cd,仍需给予持续关注.
This study investigated the spatial and temporal distribution,historical evolution and influencing factors of surface sedimentary environment in the northwestern Daya Bay by surveying 10 and 15 surface sediment stations in 2010 and 2019 respectively.The results show that:In 2010,the mean values of Cu,Pb,Zn,Cd,Cr,Hg,As and organic carbon were 32.8,41.3,120.4,0.27,40.0,0.044,8.10 mg·kg^(-1)and 1.04%,respectively,the Cu,Zn and Cd contents at C01,C02 stations near Aotou and C06,C07 stations near Shayuzhou exceeded the first-class quality standard of sediment,but all meet the second-class quality standard.The average values in 2019 were 22.1,35.3,97.2,0.06,41.2,0.046,8.14 mg·kg^(-1)and 1.17%,respectively,the Cu of E10 station in Baishou Bay exceeds the first class quality standard,but meet the second class quality standard.Based on the results of the two investigations,the spatial distribution of surface sediment elements in the northwest of Daya Bay shows a trend of higher concentration in Aotou,Dumling Bay,Baishou Bay,Shayuzhou,and the west of Pingzhi Island south of Baotazhou,while lower concentration in the central islands.A series of environmental remediation actions in Daya Bay since 2017 have no significant impact on the concentration of most of the sediment elements in Daya Bay,only the Cd content is significantly reduced.Through the comparative analysis of similar stations in 2010 and 2019,the change of RI value is not significant,that is,the overall potential ecological risk in the northwest of Daya Bay has not changed much,and the northwest of Daya Bay is still at a high to very high risk level on the whole,and the main risk pollutants are Hg and Cd,which still needs continuous attention.
作者
张伟杰
王翔
马媛
许欣
陈际雨
张浩
何嘉铧
马玉
ZHANG Weijie;WANG Xiang;MA Yuan;XU Xin;CHEN Jiyu;ZHANG Hao;HE Jiahua;MA Yu(South China Sea Marine Survey Center,Ministry of Natural Resources,Guangzhou,510300,China;Key Laboratory of Marine Environmental Survey Technology and Application,Ministry of Natural Resources,Guangzhou,510300,China)
出处
《环境化学》
北大核心
2025年第8期2874-2885,共12页
Environmental Chemistry
基金
海洋观测预报与防灾减灾项目(2200128)
自然资源部南海局科技发展基金(202205)资助.
作者简介
通信联系人:马玉,E-mail:mayu2024@126.com。
