Polar organic chemical integrative sampler (POCIS) is a passive sampling device that offers many advantages over traditional discrete sampling methods, but quantitative time-weighted average (TWA) concentrations rely heavily on the robustness of sampling rates. The effects of changing chemical concentration exposures on POCIS sampling rates and its ability to operate in an integrative regime were investigated for 12 pesticides across a range of environmentally relevant concentrations. In five independent 21-day experiments, POCIS devices were exposed to these compounds at constant concentrations ranging from 3 to 60 μg/L and multiple pulsed concentrations with maximum peaks ranging from 5 to 150 μg/L (TWA concentrations = 3 to 92 μg/L). For the 21-day exposures to constant and pulsed concentrations, there were no significant differences in the POCIS sampling rates between corresponding TWA concentrations. Similarly, there was no significant effect on POCIS ability to operate in an integrative regime. However, loss of linearity was visible for some replicates when exposed to higher pulsed concentrations over an extended period. Modeling and Freundlich isotherms did not predict sorbent saturation, but the extraction and reconstitution protocol likely contributed to atrazine dissolution and subsequent underestimation of sorbed chemical mass when HLB adsorption exceeded 400 μg.

中文翻译：

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与环境有关的浓度暴露曲线对极性有机化学综合采样器（POCIS）采样率的影响。

极性有机化学综合采样器（POCIS）是一种被动采样设备，与传统的离散采样方法相比，具有许多优点，但是定量时间加权平均（TWA）浓度在很大程度上取决于采样率的稳定性。对12种农药在一系列与环境有关的浓度范围内进行了研究，研究了化学物浓度变化对POCIS采样率的影响及其在综合方案下的运行能力。在五个独立的为期21天的实验中，POCIS设备以3至60μg/ L的恒定浓度和多个脉冲浓度暴露于这些化合物，最大峰值为5至150μg/ L（TWA浓度= 3至92μg/ L）。 L）。对于21天的恒定和脉冲浓度暴露，在相应的TWA浓度之间，POCIS采样率没有显着差异。同样，对POCIS在整合体制下运作的能力也没有显着影响。但是，长时间暴露于较高的脉冲浓度下，某些复制品的线性损失可见。建模和Freundlich等温线不能预测吸附剂的饱和度，但是当HLB吸附量超过400μg时，萃取和重构方案可能会导致阿特拉津的溶解以及随后对吸附化学物质的低估。当长时间暴露于较高的脉冲浓度下时，某些复制品的线性损失明显。建模和Freundlich等温线无法预测吸附剂的饱和度，但是当HLB吸附量超过400μg时，萃取和重建方案可能会导致阿特拉津的溶解以及随后对吸附化学质量的低估。当长时间暴露于较高的脉冲浓度下时，某些复制品的线性损失明显。建模和Freundlich等温线无法预测吸附剂的饱和度，但是当HLB吸附量超过400μg时，萃取和重建方案可能会导致阿特拉津的溶解以及随后对吸附化学质量的低估。