Tao Zhenghua, Xia Tianxiang, Chen Fengyuan, Zhang Lina, Wei Rongfei, Chen Shanshan, Jia Lin, Lan Wenlu, Pan Ke
Shenzhen Key Laboratory of Marine Microbiome Engineering, Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China; Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, Beijing Municipal Research Institute of Eco-Environmental Protection, Beijing 100037, China; Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Beijing Key Laboratory for Risk Modeling and Remediation of Contaminated Sites, Beijing Municipal Research Institute of Eco-Environmental Protection, Beijing 100037, China.
J Hazard Mater. 2024 Nov 5;479:135667. doi: 10.1016/j.jhazmat.2024.135667. Epub 2024 Aug 26.
Cadmium (Cd) pollution has gained significant attention in mangrove sediments due to its high toxicity and mobility. However, the sources of Cd and the factors influencing its accumulation in these sediments have remained elusive. In this study, we utilized lead (Pb) isotopic signatures for the first time to assess Cd contamination in mangrove sediments from the northern region of the Beibu Gulf. A strong correlation was observed between Cd and Pb concentrations in the mangrove sediments, suggesting a shared source that can be estimated using Pb isotopic signatures. By employing a Bayesian mixing model, we determined that 70.1 ± 8.2 % of Cd originated from natural sources, while 12.9 ± 4.9 %, 9.8 ± 3.7 %, and 7.1 ± 3.4 % were attributed to agricultural activities, non-ferrous metal smelting, and coal combustion, respectively. Our study clearly suggests that natural Cd could also dominate the high Cd content. Agricultural activities were the most important anthropogenic Cd sources, and the increased anthropogenic Cd accumulation in mangrove sediment was related to organic matter. This study introduces a novel approach for assessing Cd contamination in mangrove sediment, providing useful insights into Cd pollution in coastal wetlands.
镉（Cd）污染因其高毒性和高迁移性，已在红树林沉积物中受到广泛关注。然而，镉的来源以及影响其在这些沉积物中积累的因素仍不明确。在本研究中，我们首次利用铅（Pb）同位素特征来评估北部湾北部地区红树林沉积物中的镉污染情况。研究发现，红树林沉积物中镉和铅的浓度之间存在很强的相关性，这表明它们可能具有共同来源，可通过铅同位素特征进行估算。通过贝叶斯混合模型，我们确定70.1±8.2%的镉来自自然源，而分别有12.9±4.9%、9.8±3.7%和7.1±3.4%的镉来自农业活动、有色金属冶炼和煤炭燃烧。我们的研究清楚地表明，天然镉也可能是导致高镉含量的主要因素。农业活动是最重要的人为镉源，红树林沉积物中人为镉积累的增加与有机质有关。本研究介绍了一种评估红树林沉积物中镉污染的新方法，为沿海湿地的镉污染提供了有用的见解。
