Measurements of chemical persistence in natural environments can provide insight into behavior not easily replicated in laboratory studies. However, it is difficult to find environmental situations suitable for such measurements, particularly for substances with half-lives exceeding several weeks. The objective of this study was to demonstrate that a strategic postflood monitoring campaign can be used to quantify transformation half-lives on the scale of months in a real aquatic system. Water samples were collected in the upper Brisbane River estuary on 36 occasions over 37 weeks and analyzed for 127 pharmaceuticals and personal care products (PPCPs), pesticides, and perfluoroalkyl substances (PFASs). High quality time trend data were obtained for 41 substances. For many of these, data on the input of a wastewater treatment plant to the upper estuary were also obtained. A mass balance model of the estuary stretch was formulated and parametrized using PFASs as persistent benchmarking chemicals. Transformation half-life estimates were obtained for 10 PPCPs and 7 pesticides ranging from 18 to 260 days. Furthermore, insight was obtained into dominant transformation processes as well as the magnitude of chemical inputs to the estuary and their sources. The approach developed shows that under certain conditions, estuaries can be used to quantify the persistence of organic contaminants with half-lives of the order of several months.

中文翻译：

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亚热带河口的洪水后监测和全氟和多氟烷基物质的基准允许以月为单位测量化学持久性

自然环境中化学持久性的测量可以深入了解实验室研究中不容易复制的行为。然而，很难找到适合这种测量的环境条件，特别是对于半衰期超过几周的物质。本研究的目的是证明战略性洪水后监测活动可用于量化真实水生系统中以月为单位的转化半衰期。在 37 周内在布里斯班河上游河口采集了 36 次水样，并分析了 127 种药物和个人护理产品 (PPCP)、杀虫剂和全氟烷基物质 (PFAS)。获得了 41 种物质的高质量时间趋势数据。对于其中许多，还获得了污水处理厂向河口上游输入的数据。使用全氟和多氟烷基物质作为持久性基准化学品，制定了河口河段的质量平衡模型并对其进行了参数化。获得了 10 种 PPCP 和 7 种农药的转化半衰期估计值，范围为 18 至 260 天。此外，还深入了解了主要的转化过程以及河口及其来源的化学输入量。开发的方法表明，在某些条件下，河口可用于量化半衰期为几个月的有机污染物的持久性。获得了 10 种 PPCP 和 7 种农药的转化半衰期估计值，范围为 18 至 260 天。此外，还深入了解了主要的转化过程以及河口及其来源的化学输入量。开发的方法表明，在某些条件下，河口可用于量化半衰期为几个月的有机污染物的持久性。获得了 10 种 PPCP 和 7 种农药的转化半衰期估计值，范围为 18 至 260 天。此外，还深入了解了主要的转化过程以及河口及其来源的化学输入量。开发的方法表明，在某些条件下，河口可用于量化半衰期为几个月的有机污染物的持久性。