State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China.
State Key Laboratory of Water Environment Simulation, School of Environment, Beijing Normal University, Beijing 100875, China; Advanced Interdisciplinary Institute of Environment and Ecology, Beijing Normal University, Zhuhai 519087, China.
Mar Pollut Bull. 2022 Sep;182:113946. doi: 10.1016/j.marpolbul.2022.113946. Epub 2022 Jul 20.
Organic pollutants are ubiquitous in estuarine areas, nonetheless, the transport mechanisms of herbicides in such areas are limited. Atrazine and acetochlor were analyzed in suspended particle matter (SPM), surface sediment, and surface water from the Yellow River estuary and the surrounding rivers and sea. Among these rivers, the Yellow River contributes the most herbicide flux to the sea annually. The herbicide concentrations in water and sediment decreased from the estuarine areas to the deep sea. The fugacity fraction values of atrazine exceeded 0.5 in the Yellow River estuary, which supported that the herbicides in sediment desorbed at the estuarine areas. The herbicide in the SPM showed high concentration in the outer sea and increased as a power function with decreasing SPM content. The increasing partition capacity indicated that the herbicides tended to sink into sediment, increasing the ecological risk posed by herbicides. The ecological risk of acetochlor deserves continuous attention.
有机污染物在河口地区普遍存在，但此类地区的除草剂传输机制仍有限。本研究分析了黄河口及其周边河流和海域悬浮颗粒物（SPM）、表层沉积物和表层水中的阿特拉津和乙草胺。在这些河流中，黄河每年向海洋输送的除草剂通量最大。水和沉积物中的除草剂浓度从河口区向深海区逐渐降低。黄河口处阿特拉津的逸度分数值超过 0.5，表明沉积物中的除草剂在河口区解吸。SPM 中的除草剂在外海浓度较高，且随 SPM 含量的降低呈幂函数增加。增加的分配容量表明，除草剂趋于沉入沉积物，增加了除草剂带来的生态风险。乙草胺的生态风险值得持续关注。
