Department of Environment and Geography, University of Manitoba, Winnipeg, MB, Canada.
University of Guelph, School of Environmental Sciences, Guelph, ON, Canada.
Bull Environ Contam Toxicol. 2024 Apr 2;112(4):53. doi: 10.1007/s00128-024-03879-w.
The objectives of this study were to: (1) characterize the exposure of aquatic ecosystems in Southern Ontario, Canada to pesticides between 2002 and 2016 by constructing environmental exposure distributions (EEDs), including censored data; and (2) predict the probability of exceeding acute regulatory guidelines. Surface water samples were collected over a 15-year period by Environment and Climate Change Canada. The dataset contained 167 compounds, sampled across 114 sites, with a total of 2,213 samples. There were 67,920 total observations of which 55,058 were non-detects (81%), and 12,862 detects (19%). The most commonly detected compound was atrazine, with a maximum concentration of 18,600 ngL and ~ 4% chance of exceeding an acute guideline (1,000 ngL) in rivers and streams. Using Southern Ontario as a case study, this study provides insight into the risk that pesticides pose to aquatic ecosystems and the utility of EEDs that include censored data for the purpose of risk assessment.
(1) 通过构建环境暴露分布（EED），包括截尾数据，描述加拿大安大略省南部的水生生态系统在 2002 年至 2016 年期间接触农药的情况；(2) 预测超过急性监管指南的概率。加拿大环境与气候变化部在 15 年内采集了地表水样本。该数据集包含 167 种化合物，在 114 个地点进行了采样，共有 2213 个样本。共有 67920 个总观测值，其中 55058 个为未检出（81%），12862 个为检出（19%）。最常见的检测化合物是莠去津，其浓度最高为 18600ng/L，河流和溪流中超过急性指南（1000ng/L）的概率约为 4%。本研究以安大略省南部为案例研究，深入了解农药对水生生态系统的风险，以及包括截尾数据在内的 EED 在风险评估中的应用。
