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河口沉积物中PFAS的时空空间趋势:对化聚甲基乙烯硫酸盐转化过程的洞察

Qi Wang^1,2,3, Yuefei Ruan^1,2,3,4, Yetong Shao^1,2

¹State Key Laboratory of Marine Pollution (SKLMP), City University of Hong Kong, Hong Kong SAR 999077, China.

Environmental science & technology

|April 2, 2025

概括

这项研究分析了珍珠河三角洲沉积物中的和多基基物质 (PFAS). 最近PFOS水平下降,而长链PFAS和新型H-PFESA化合物增加,造成环境风险.

科学领域:

环境化学环境化学
海洋科学海洋科学
污染研究污染研究

背景情况:

和多基基物质 (PFAS) 是在海洋环境中积累的持久合成化学物质.
海洋沉积物充当PFAS的重要沉点,需要详细研究其分布和趋势.
珍珠河三角洲和南海北部 (NSCS) 是全球公认的污染热点.

研究的目的:

调查珍珠河出口,河口和NSCS的沉积物中的45种遗留和新兴PFAS的发生和历史趋势.
为了确定新的PFAS化合物,并了解它们在沉积体内转化途径.
进行初步风险评估,确定PFAS对海洋生态系统的风险.

主要方法:

从20世纪40年代到2020年代收集和分析表面沉积物样本和沉积物核心.
使用先进的分析技术量化45个目标PFAS.
评估PFAS度趋势的时间和空间分布在研究区域内.

主要成果:

总PFAS度有显著的变化,与NSCS (31.6-363 pg/g dw) 相比,在河流出口附近 (244-14400 pg/g dw) 发现的水平更高.
近几十年来, perfluorooctanesulfonate (PFOS) 度达到峰值,随后下降,而长链 perfluorinated carboxylates 自20世纪80年代以来呈现上升趋势,在21世纪加速.
在较古老的沉积物中首次检测到用替代的聚甲基乙烯硫酸盐 (H-PFESA),其比例在 6:2 H-PFESA 和 6:2 化 (Cl-) PFESA 的比例上升,这表明现场转化.

结论:

珍珠河三角洲和NSCS的沉积物被各种各样的PFAS污染,包括H-PFESA等新兴化合物.
历史趋势表明PFOS的下降,但其他PFAS的增加,突出显示不断变化的污染模式.
PFOS和6:2 PFESA在研究区域中构成中等至高的生态风险,强调需要采取有效的污染控制措施.

关键词:

Cl-PFESASA 的使用情况.美国F-53B战斗机这是一个H-PFESASA.对于PFECHSHS来说,这是一个很好的方法.沉积物的核心是沉积物.时间趋势的趋势.

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