The University of Queensland, National Research Centre for Environmental Toxicology (Entox), 39 Kessels Rd, Coopers Plains, QLD 4108, Australia.
Mar Pollut Bull. 2012 May;64(5):1005-11. doi: 10.1016/j.marpolbul.2012.02.004. Epub 2012 Mar 8.
Passive sampling techniques facilitate the time-integrated measurement of pollutant concentrations through the use of a selective receiving phase. Accurate quantification using passive sampling devices rely on the implementation of methods that will negate the effects of environmental factors (flow, temperature, etc.) or that will allow the calculation of the chemical specific rates of uptake (R(s)) into the passive sampler employed. We have applied an in situ calibration technique based on the dissolution of gypsum to measure the average water velocity to which a sampler has been exposed. We demonstrate that the loss of gypsum from the passive flow monitor (PFM) can be applied to predict changes in R(s) dependent on flow when using the absorbent SPMD (semipermeable membrane device) and PDMS (polydimethyl siloxan) passive samplers. The application of the PFM will enhance the accuracy of measurements made when calculating and reporting environmental pollutant concentrations using a passive sampling device.
被动采样技术通过使用选择性接收相来促进污染物浓度的时间积分测量。使用被动采样设备进行准确的定量需要采用能够消除环境因素（流速、温度等）影响的方法，或者能够计算化学物质进入被动采样器的特定吸收率（R(s)）的方法。我们已经应用了一种基于石膏溶解的原位校准技术来测量采样器暴露的平均水速度。我们证明，当使用吸收型 SPMD（半渗透膜装置）和 PDMS（聚二甲基硅氧烷）被动采样器时，从被动流量监测器（PFM）中损失的石膏可用于预测 R(s)随流速的变化。PFM 的应用将提高使用被动采样器计算和报告环境污染物浓度时的测量精度。
