Nonylphenol, octylphenol, and nonylphenol ethoxylates are manmade compounds that are only discharged in the environment due to anthropogenic activities. The objectives of this study were to determine the current concentrations of these substances in the Canadian freshwater environment and to determine if past regulatory actions were beneficial to the environment. Freshwater samples (n = 241) were collected and analysed for 4-nonylphenols (NP), nonylphenol monoethoxylate (NP₁EO), nonylphenol diethoxylate (NP₂EO), and octylphenols at 35 sites in Canada from 2014 to 2019 with individual compound concentrations ranging from 1.29 to 477.22 ng/L. In addition, 18–65% of the samples were reported to be under the laboratory detection limit, depending on the compound. Sampling sites were categorised into five groups based on the dominant activities present upstream in their watersheds: mixed use sites; municipal waste water treatment plant (MWWTP)-associated sites; textile mill-associated sites; urban; and reference sites. All four compounds in the study were detected more frequently in urban and MWWTP-associated sites than at other locations. Additionally, there is a statistically significant (p < 0.05) downward temporal trend in NP concentrations in Canadian surface waters from 2014 to 2019. There were no exceedances of the Canadian Water Quality Guideline of 1000 ng/L.

壬基酚，辛基酚和壬基酚乙氧基化物是人为化合物，由于人为活动而仅排放到环境中。这项研究的目的是确定加拿大淡水环境中这些物质的当前浓度，并确定过去的管制措施是否对环境有利。 收集淡水样品（n = 241）并分析4-壬基酚（NP），壬基酚单乙氧基化物（NP ₁ EO），壬基酚二乙氧基化物（NP _2）EO）和2014年至2019年在加拿大35个地点的辛基苯酚，单个化合物的浓度范围为1.29至477.22 ng / L。此外，据报告，根据化合物的不同，有18-65％的样品处于实验室检测极限以下。根据流域上游主要活动将抽样地点分为五类：混合用途地点；与市政废水处理厂（MWWTP）相关的场所；纺织厂相关场所；城市 和参考站点。该研究中的所有四种化合物在城市和与MWWTP相关的站点中的检出频率均高于其他位置。此外，在统计上有显着性（p <0.05）2014年至2019年加拿大地表水中NP浓度的下降趋势。加拿大水质准则未超过1000 ng / L。