Implications of seawater characteristics on dissolved heavy metals in near-shore surface waters of the Yellow Sea

IF 5.3 3区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Marine pollution bulletin Pub Date : 2025-02-01 DOI:10.1016/j.marpolbul.2024.117469

Minghao Li , Dongsheng Ding , Yong Xu , Qian Yang , Jun Sun , Keming Qu , Zhengguo Cui , Yuqiu Wei

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引用次数: 0

Abstract

To explore the response of dissolved heavy metals (HMs) along the Yellow Sea coast to seawater characteristics, we assessed the temporal and spatial variations as well as pollution levels of six dissolved HMs (Cu, Zn, Pb, Cd, Hg, and As) in surface seawater from 2021 to 2023. The results indicated that the average concentrations of HMs in the seawater were ranked as follows: Zn > Cu > As > Pb > Cd > Hg, with specific concentration ranges of 4.70–7.01, 0.64–2.83, 0.02–2.83, 0.05–1.37, 0.14–0.55, and 0.02–0.20 μg L⁻¹, respectively. Spatial distribution revealed irregular fluctuations in HM concentrations between nearshore and offshore regions. Analyses of the metal sources suggested that HMs were diffusing from nearshore to offshore, indicating that land-based inputs were the primary source of dissolved HMs along the coast of the Yellow Sea. During the study period, Hg exceeded environmental safety threshold in the study area, indicating a potential ecological risk from Hg pollution. Furthermore, Pb showed signs of pollution in certain seasons. Regarding the correlation of variables, Cu showed the strongest correlation with temperature and dissolved oxygen (DO), but Zn showed a significant correlation with temperature and salinity. Differently, Pb, Cd, Hg, and As were markedly associated with DO and salinity. The complex interactions between environmental variables significantly influenced HM concentrations, and no single factor could adequately explain these changes. Taken together, the alterations in seawater characteristics along the coast of the Yellow Sea had significantly impacted the dissolved HMs during the study period.

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黄海近岸地表水海水特征对溶解重金属的影响。

为探讨黄海沿岸表层海水中溶解重金属（Cu、Zn、Pb、Cd、Hg、as）的时空变化特征及其污染水平，研究了2021 - 2023年黄海沿岸表层海水中溶解重金属（HMs）的变化特征。结果表明，海水中hm的平均浓度依次为Zn > Cu > as > Pb > Cd > Hg，比浓度范围分别为4.70 ~ 7.01、0.64 ~ 2.83、0.02 ~ 2.83、0.05 ~ 1.37、0.14 ~ 0.55、0.02 ~ 0.20 μg L-1。HM浓度在近岸和近海区域的空间分布呈不规则波动。对金属来源的分析表明，重金属正从近岸向近海扩散，这表明陆地输入是黄海沿岸溶解重金属的主要来源。研究期间，研究区汞含量超过环境安全阈值，存在潜在的汞污染生态风险。此外，Pb在某些季节也有污染迹象。在变量相关性方面，Cu与温度和溶解氧（DO）相关性最强，Zn与温度和盐度相关性显著。不同的是，铅、镉、汞和砷与DO和盐度显著相关。环境变量之间复杂的相互作用显著影响HM浓度，没有单一因素可以充分解释这些变化。综上所述，黄海沿岸海水特征的变化对研究期间溶解的HMs有显著影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Marine pollution bulletin 环境科学-海洋与淡水生物学

CiteScore

10.20

自引率

15.50%

发文量

1077

审稿时长

68 days

期刊介绍： Marine Pollution Bulletin is concerned with the rational use of maritime and marine resources in estuaries, the seas and oceans, as well as with documenting marine pollution and introducing new forms of measurement and analysis. A wide range of topics are discussed as news, comment, reviews and research reports, not only on effluent disposal and pollution control, but also on the management, economic aspects and protection of the marine environment in general.