Department of Food Science and Agricultural Chemistry , McGill University , 21111 Lakeshore , Ste-Anne-de-Bellevue , H9X 3 V9 Quebec , Canada.
Department of Geography , National University of Singapore , 1 Arts Link, AS2 #03-01 , Singapore 117570.
Environ Sci Technol. 2019 Mar 5;53(5):2549-2558. doi: 10.1021/acs.est.8b06122. Epub 2019 Feb 11.
Knowledge regarding partitioning behavior and bioaccumulation potential of environmental contaminants is important for ecological and human health risk assessment. While a range of models are available to describe bioaccumulation potential of hydrophobic organic chemicals (HOCs) in temperate aquatic food webs, their applicability to tropical systems still needs to be validated. The present study involved field investigations to assess the occurrence, partitioning, and bioaccumulation behavior of several legacy and emerging HOCs in mangrove ecosystems in Singapore. Concentrations of synthetic musk fragrance compounds, methyl triclosan (MTCS), polychlorinated biphenyls, organochlorine pesticides, and polycyclic aromatic hydrocarbons were measured in mangrove sediments, clams, and caged mussels. Freely dissolved concentrations of the HOCs in water were determined using silicone rubber passive samplers. Results showed that polycyclic musks and MTCS are present in mangrove ecosystems and can accumulate in the tissues of mollusks. The generated HOC concentration data for mangrove water, sediments, and biota samples was further utilized to evaluate water-sediment partitioning (e.g., K values) and bioaccumulation behavior (e.g., BAF and BSAF values). Overall, the empirical models fit reasonably well with the data obtained for this ecosystem, supporting the concept that general models are applicable to predict the behavior of legacy and emerging HOCs in mangrove ecosystems.
了解环境污染物的分配行为和生物累积潜力对于生态和人类健康风险评估很重要。虽然有一系列模型可用于描述温带水生食物网中疏水性有机化学品（HOCs）的生物累积潜力，但仍需要验证其在热带系统中的适用性。本研究涉及野外调查，以评估新加坡红树林生态系统中几种传统和新兴 HOC 的存在、分配和生物累积行为。在红树林沉积物、蛤和笼养贻贝中测量了合成麝香香料化合物、甲基三氯生（MTCS）、多氯联苯、有机氯农药和多环芳烃的浓度。使用硅橡胶被动采样器测定水中 HOC 的自由溶解浓度。结果表明，多环麝香和 MTCS 存在于红树林生态系统中，并可在贝类组织中积累。进一步利用生成的红树林水、沉积物和生物群样本中的 HOC 浓度数据来评估水-沉积物分配（例如，K 值）和生物累积行为（例如，BAF 和 BSAF 值）。总体而言，经验模型与该生态系统获得的数据拟合得相当好，支持了一般模型适用于预测传统和新兴 HOC 在红树林生态系统中的行为的概念。
