Time-weighted average water sampling in Lake Ontario with solid-phase microextraction passive samplers
Time-weighted average water sampling in Lake Ontario with solid-phase microextraction passive samplers
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DOI：
10.1021/es062647a
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发表时间：
2007-06-01
影响因子：
11.4
通讯作者：
Pawliszyn, Janusz
中科院分区：
文献类型：
--
作者：
Ouyang, Gangfeng;Zhao, Wennan;Pawliszyn, Janusz
在这项研究中，三种类型的固相微萃取（SPME）被动采样器，包括一个纤维回缩装置，聚二甲基硅氧烷（PDMS）杆和PDMS膜，进行了评估，以确定时间加权平均（TWA）的多环芳烃（PAHs）的浓度在汉密尔顿港（加拿大安大略，ON的西端）。现场试验表明，这些类型的SPME采样器适合于水中有机污染物的长期监测。这些进样器具有SPME的所有优点：它们不含溶剂，将进样、萃取和浓缩合并为一个步骤，并且可以直接进样到气相色谱仪（GC）中进行分析，而无需进一步处理。这些采样器还解决了被动采样技术的额外需求：它们经济，易于部署，并且可以通过一个采样器获得目标分析物的TWA浓度。此外，这些采样器的质量吸收是独立的面速度，或效果可以校准，这是长期的现场采样，特别是当采样环境的对流条件是难以测量和校准所需的。在所测试的三种类型的SPME采样器中，PDMS膜具有最高的表面积与体积比，这导致最高的灵敏度和质量吸收以及最低的检测水平。
In this study, three types of solid-phase microextraction (SPME) passive samplers, including a fiber-retracted device, a polydimethylsiloxane (PDMS)-rod and a PDMS-membrane, were evaluated to determine the time weighted average (TWA) concentrations of polycyclic aromatic hydrocarbons (PAHs) in Hamilton Harbor (the western tip of Lake Ontario, ON, Canada). Field trials demonstrated that these types of SPME samplers are suitable for the long-term monitoring of organic pollutants in water. These samplers possess all of the advantages of SPME: they are solvent-free, sampling, extraction and concentration are combined into one step, and they can be directly injected into a gas chromatograph (GC) for analysis without further treatment. These samplers also address the additional needs of a passive sampling technique: they are economical, easy to deploy, and the TWA concentrations of target analytes can be obtained with one sampler. Moreover, the mass uptake of these samplers is independent of the face velocity, or the effect can be calibrated, which is desirable for long-term field sampling, especially when the convection conditions of the sampling environment are difficult to measure and calibrate. Among the three types of SPME samplers that were tested, the PDMS-membrane possesses the highest surface-to-volume ratio, which results in the highest sensitivity and mass uptake and the lowest detection level.