Effects of hydrodynamic conditions and temperature on polar organic chemical integrative sampling rates
Effects of hydrodynamic conditions and temperature on polar organic chemical integrative sampling rates
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DOI：
10.1002/etc.4225
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发表时间：
2018-09-01
影响因子：
4.1
通讯作者：
Chambliss, C. Kevin
中科院分区：
文献类型：
--
作者：
Djomte, Valerie Toteu;Taylor, Raegyn B.;Chambliss, C. Kevin
研究了水动力条件和温度变化对12种植保化学品的极性有机综合采样器采样率(R-S)的影响。在每个实验室实验中，曝光浓度保持不变，并根据测量的POCIS装置表面附近的水边界层的传质系数来计算流速。在一定温度下，滞流和较高流速(6-21 cm/S)之间的R-S一般增加2-5倍，但对于大多数化合物来说，在较高流速之间的R-S基本不变。在一定的流动条件下，温度在8-39℃之间变化时，R-S呈线性增加。总体而言，在流动和停滞条件下，R-S在该温度范围内分别增加了2~4倍和2~8倍。用Arrhenius模型描述了POCIS采样率与温度的关系。R-S对温度的调整不能完全解释从POCI和野外复合水样测定的阿特拉津时间加权平均浓度之间的观察到的差异，这表明其他竞争因素的影响仍然需要评估。环境毒物化学2018；37：2331-2339。(C)2018年SETAC
The effects of changing hydrodynamic conditions and changing temperatures on polar organic chemical integrative sampler (POCIS) sampling rates (R-s) were investigated for 12 crop protection chemicals. Exposure concentration was held constant in each laboratory experiment, and flow velocities were calculated from measured mass transfer coefficients of the water boundary layer near the surface of POCIS devices. At a given temperature R-s generally increased by a factor of 2 to 5 between a stagnant condition and higher flow velocities (6-21cm/s), but R-s for most compounds was essentially constant between the higher flow velocities. When temperature was varied between 8 and 39 degrees C for a given flow condition, R-s increased linearly. In general, R-s increased by a factor of 2 to 4 and 2 to 8 over this temperature range under flow and stagnant conditions, respectively. An Arrhenius model was used to describe the dependence of POCIS sampling rates on temperature. Adjustments of R-s for temperature did not fully explain observed differences between time-weighted average concentrations of atrazine determined from POCIS and from composite water sampling in a field setting, suggesting that the effects of other competing factors still need to be evaluated. Environ Toxicol Chem 2018;37:2331-2339. (c) 2018 SETAC