Evaluation of the Use of Performance Reference Compounds in an Oasis-HLB Adsorbent Based Passive Sampler for Improving Water Concentration Estimates of Polar Herbicides in Freshwater
Evaluation of the Use of Performance Reference Compounds in an Oasis-HLB Adsorbent Based Passive Sampler for Improving Water Concentration Estimates of Polar Herbicides in Freshwater
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DOI：
10.1021/es902256m
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发表时间：
2010-03-01
影响因子：
11.4
通讯作者：
Huckins, James N.
中科院分区：
文献类型：
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作者：
Mazzella, Nicolas;Lissalde, Sophie;Huckins, James N.
被动采样器，如极地有机化学综合采样器（POCIS）是有用的工具，监测痕量水平的极性有机化学品在水生环境中。使用性能参比化合物（PRC）掺入POCIS吸附剂进行原位校准，可以改善基于这种类型的采样器的水浓度估计的半定量性质。在这项工作中，氘标记的阿特拉津-去异丙基（DIA-d5）被选为PRC，因为它相对于Oasis HLB（所用的POCIS吸附剂）的逸度较高，我们早期的证据表明它的各向同性交换。现场校准POCIS加标DIA-d5进行，并将所得的时间加权平均浓度估计值与配备Oasis HLB柱的自动进样器的类似值进行比较。在PRC校正之前，基于实验室校准暴露的POCIS数据采样率的水浓度估计值系统性地低于使用自动采样器获得的参考浓度。使用DIA-d5 PRC数据校正POCIS采样率缩小了两种方法得出的相应值之间的差异。PRCs的应用，在现场校准似乎有希望改善POCIS衍生的极性农药的浓度估计。然而，当通过HPLC-ESI-MS/MS进行定量时，必须小心注意将基质效应降至最低。
Passive samplers such as the Polar Organic Chemical Integrative Sampler (POCIS) are useful tools for monitoring trace levels of polar organic chemicals in aquatic environments. The use of performance reference compounds (PRC) spiked into the POCIS adsorbent for in situ calibration may improve the semiquantitative nature of water concentration estimates based on this type of sampler. In this work, deuterium labeled atrazine-desisopropyl (DIA-d5) was chosen as PRC because of its relatively high fugacity from Oasis HLB (the POCIS adsorbent used) and our earlier evidence of its isotropic exchange. In situ calibration of POCIS spiked with DIA-d5 was performed, and the resulting time-weighted average concentration estimates were compared with similar values from an automatic sampler equipped with Oasis HLB cartridges. Before PRC correction, water concentration estimates based on POCIS data sampling rates from a laboratory calibration exposure were systematically lower than the reference concentrations obtained with the automatic sampler. Use of the DIA-d5 PRC data to correct POCIS sampling rates narrowed differences between corresponding values derived from the two methods. Application of PRCs for in situ calibration seems promising for improving POCIS-derived concentration estimates of polar pesticides. However, careful attention must be paid to the minimization of matrix effects when the quantification is performed by HPLC-ESI-MS/MS.