POCIS Calibration for Organic Compound Sampling in Small Headwater Streams.,Environmental Toxicology and Chemistry

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POCIS Calibration for Organic Compound Sampling in Small Headwater Streams.
Environmental Toxicology and Chemistry ( IF 3.6 ) Pub Date : 2020-05-14 , DOI: 10.1002/etc.4731
Kees Booij ₁ , Sunmao Chen ₂ , Jennifer R Trask ₃

Affiliation

Field‐based atrazine sampling rates (R _s) obtained by the polar organic chemical integrative sampler (POCIS) method were measured in 9 headwater streams over 3 yr covering 5 to 6 exposure periods of 2 to 3 wk/site/yr. Rates were best in line with the model R _s = 148 mL/d, with a standard deviation of 0.17 log units (factor 1.5). The POCIS canisters reduced mass transfer coefficients of the water boundary layer by a factor of 2 as measured by alabaster dissolution rates. A mechanistic model that accounts for flow and temperature effects yielded a fair estimate of the effective exchange surface area (12.5 ± 0.8 cm²). This model could only be tested for higher flow velocities because of uncertainties associated with the measurement of flow velocities <1 cm/s. Pictures of sorbent distributions in POCIS devices showed that the effective exchange surface area varied with time during the exposures. Error analysis indicated that sorbent distributions and chemical analysis were minor error sources. Our main conclusion is that an atrazine sampling rate of 148 mL/d yielded consistent results for all 3 yr across 9 headwater streams. Environ Toxicol Chem 2020;39:1334–1342. © 2020 SETAC

中文翻译：

小源头水流中有机化合物采样的POCIS校准。

通过极性有机化学综合采样器（POCIS）方法获得的田间at去津采样率（R _s）在3年中的9个源头水流中进行了测量，覆盖了5至6个2至3 wk /站点/年的暴露时间。速率最符合模型R _s = 148 mL / d，标准偏差为0.17 log单位（系数1.5）。POCIS罐将水边界层的传质系数降低了2倍，如雪花石膏的溶解速率所测。考虑流动和温度影响的机械模型可以对有效交换表面积（12.5±0.8 cm ²）。由于与小于1 cm / s的流速测量相关的不确定性，因此只能对较高的流速进行测试。POCIS设备中吸附剂分布的图片显示，在暴露过程中，有效交换表面积随时间而变化。误差分析表明，吸附剂分布和化学分析是次要误差来源。我们的主要结论是，在3个9年的源头水流中，阿特拉津的采样速率均为148 mL / d，可得到一致的结果。环境毒性化学2020； 39：1334–1342。©2020 SETAC

更新日期：2020-06-25

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