Senator George J. Mitchell Center for Environmental and Watershed Research, University of Maine, Orono, ME 04469, USA.
Environ Pollut. 2012 Oct;169:98-104. doi: 10.1016/j.envpol.2012.05.001. Epub 2012 Jun 15.
The polar organic chemical integrative sampler (POCIS) was calibrated to monitor pesticides in water under controlled laboratory conditions. The effect of natural organic matter (NOM) on the sampling rates (R(s)) was evaluated in microcosms containing <0.1-5 mg L(-1) of total organic carbon (TOC). The effect of hydrodynamics was studied by comparing R(s) values measured in stirred (SBE) and quiescent (QBE) batch experiments and a flow-through system (FTS). The level of NOM in the water used in these experiments had no effect on the magnitude of the pesticide sampling rates (p > 0.05). However, flow velocity and turbulence significantly increased the sampling rates of the pesticides in the FTS and SBE compared to the QBE (p < 0.001). The calibration data generated can be used to derive pesticide concentrations in water from POCIS deployed in stagnant and turbulent environmental systems without correction for NOM.
极性有机化学整合采样器 (POCIS) 经过校准，可以在受控的实验室条件下监测水中的农药。在含有 <0.1-5 mg L(-1) 总有机碳 (TOC) 的微宇宙中评估了天然有机物 (NOM) 对采样速率 (R(s)) 的影响。通过比较搅拌 (SBE) 和静止 (QBE) 批量实验以及流动系统 (FTS) 中测量的 R(s) 值来研究水动力的影响。这些实验中所用的水中 NOM 水平对农药采样速率的大小没有影响 (p > 0.05)。然而，与 QBE 相比，流速和湍流显著增加了 FTS 和 SBE 中农药的采样速率 (p < 0.001)。生成的校准数据可用于从部署在静态和动态环境系统中的 POCIS 中得出水中农药浓度，而无需对 NOM 进行校正。
