University of Applied Sciences Hamburg , Lohbrügger Kirchstraße 65, 21033 Hamburg, Germany.
Environ Sci Technol. 2013 Jul 16;47(14):7830-9. doi: 10.1021/es400395t. Epub 2013 Jul 2.
In this study, an equilibrium passive sampling device is introduced that facilitates the in situ measurement of hydrophobic organic chemicals bioavailability in sediments in terms of freely dissolved concentrations. The new field sampler allows SPME fibers and silicone hollow fibers to be immersed and equilibrated in situ, whereas an automated liner exchanger (ALEX) facilitates the quantitative transfer of analytes to the GC without the use of extraction solvents. The sampler was developed for environmental monitoring as follows: (1) It is of very solid construction and can be reused practically ad infinitum. (2) Fibers with varying surface to volume ratios can be exposed in parallel in order to confirm that equilibrium was reached between sampler and sediment. (3) The equilibrium times allow a temporal resolution that is suited for monitoring of both long-term trends and seasonal effects. The automated thermal desorption reduced sample treatment to a minimum and ensured cost- and time-efficient measurements while minimizing potential error sources after the sampling. The sampler is applicable in a multitude of aquatic environments, especially where currents are low and sediments are muddy and well-mixed, e.g. by bioturbation. Examples for such environments are mud flats, harbor basins, river banks, and lakes.
在这项研究中，引入了一种平衡式被动采样装置，可根据游离溶解浓度原位测量沉积物中疏水性有机化学品的生物有效性。新型野外采样器可使 SPME 纤维和硅树脂中空纤维原位浸入并达到平衡，而自动化衬管交换器（ALEX）则可在无需使用萃取溶剂的情况下，将分析物定量转移至 GC。该采样器为环境监测而开发，具有以下特点：（1）其结构非常坚固，可无限期重复使用。（2）可平行暴露具有不同表面积/体积比的纤维，以确认采样器与沉积物之间达到平衡。（3）平衡时间可实现时间分辨率，适合监测长期趋势和季节性影响。自动化热解吸将样品处理减少到最低限度，确保了成本和时间效益的测量，同时在采样后最小化了潜在的误差源。该采样器适用于多种水生环境，特别是在水流缓慢、沉积物泥泞且混合良好的情况下，例如通过生物扰动。此类环境的示例包括泥滩、港口盆地、河岸和湖泊。
