Description and evaluation of a sampling system for long-time monitoring of PAHs wet deposition.
Description and evaluation of a sampling system for long-time monitoring of PAHs wet deposition.
复制标题
用于长期监测多环芳烃湿沉降的采样系统的描述和评估。
DOI：
10.1016/s0045-6535(02)00284-9
复制
发表时间：
2002
期刊：
影响因子：
8.8
通讯作者：
K. Günther
中科院分区：
文献类型：
--
作者：
F. Cereceda;E. Kleist;H. Prast;H. Schlimper;H. Engel;K. Günther
本文描述了一种新型电子控制全年仅湿采样器，用于微量有机化合物（例如空气中的多环芳烃）的湿沉积。采样器提供原位过滤的沉淀以及预浓缩的非极性有机化合物的C18-PAH改性硅胶柱的装置。整个装置是绝缘的，并配备有加热元件，允许收集湿沉积物，如冰或雪，并确保即使在寒冷的天气下采样系统的正确功能。颗粒相和溶解相的同时化学分析通过高分辨率气相色谱法与火焰离子化检测或HPLC与荧光检测进行。通过分析多环芳烃加标水（模拟雨），并使用NIST SRM 1649（“城市灰尘”）作为认证材料的颗粒结合多环芳烃在降水中证明了该方法的可靠性。这项研究证明，令人满意的回收率作为颗粒结合和未结合的水PAH，只有很小的损失，以收集器表面。结果表明，该采样器可用于城市湿沉降物中多环芳烃的长期监测。
In this paper a new electronically controlled year-round wet-only sampler for wet deposition of trace organic compounds (e.g. airborne PAHs) is described. The sampler provides in situ filtration of the precipitation as well as preconcentration of nonpolar organic compounds by means of a C18-PAH modified silica gel cartridge. The whole assembly is insulated and equipped with heating elements which permit collection of wet deposition as ice or snow and insure correct function of the sampling system even during cold weather. Concurrent chemical analysis of both the particulate and the dissolved phases is performed by high resolution gas chromatography with flame ionization detection or HPLC with fluorescence detection. The reliability of the method was proved by analyzing PAH spiked water (simulated rain) and using NIST SRM 1649 (`urban dust') as certified material for particle-bound PAHs in precipitation. This study proved satisfactorily recoveries of as both particle-bound and unbound aqueous PAH, with only small losses to collector surfaces. It was proved that this new wet-only precipitation sampler can successfully be used for long-time monitoring of PAH in wet depositions in urban areas.