García-Flor N, Guitart C, Bodineau L, Dachs J, Bayona J M, Albaigés J
Environmental Chemistry Department, IIQAB-CSIC, C/Jordi Girona 18-26, 08034 Barcelona, Spain.
Mar Environ Res. 2005 Apr;59(3):255-75. doi: 10.1016/j.marenvres.2004.05.006.
Over 30 sea surface microlayer (SML) samples from two contrasting sites in the North Western Mediterranean -- Barcelona (Spain) and Banyuls-sur-Mer (France) -- were collected using three different sampling devices, namely, glass plate, metal screen (MS) and a surface slick sampler (SS), and compared with the corresponding underlying water (16 samples). The distributions of 41 polychlorinated biphenyl congeners (PCBs) were determined in the different phases: particulate (1.17-10.8 SigmaPCB ng L(-1)), truly dissolved (0.080-16.7 SigmaPCB ng L(-1)) and colloidal matter (1.17-43.0 SigmaPCB ng L(-1)), being the last two estimated from the analysis of the apparently dissolved phase. Concentrations of PCBs in the SML were higher than those in the underlying water (ULW), giving rise to enrichment factors (EF=C/C) up to first-order of magnitude. The ANOVA statistical approach was used to assess differences of bulk data (e.g. dissolved organic carbon, DOC; particulate organic carbon, POC; suspended particulate matter, SPM) among sampling devices, whilst p-tailed t paired tests were used in order to compare the enrichments obtained for each sampling date. In this respect, no significantly different enrichment factors were found among sampling devices (p < 0.05), although the surface SS showed lower enrichments, probably due to the dilution of the SML with the ULW during sampling. The MS seemed to be the most suitable device for the determination of PCBs in the SML in terms of sampling efficiency under a variety of meteorological conditions.
在西北地中海两个形成对比的地点——巴塞罗那（西班牙）和滨海巴纽尔斯（法国），使用三种不同的采样设备，即玻璃板、金属筛网（MS）和表面浮油采样器（SS），采集了30多个海表面微层（SML）样本，并与相应的底层水（16个样本）进行了比较。测定了41种多氯联苯同系物（PCBs）在不同相中的分布：颗粒相（1.17 - 10.8∑PCB纳克/升）、真溶解相（0.080 - 16.7∑PCB纳克/升）和胶体物质相（1.17 - 43.0∑PCB纳克/升），后两者是通过对表观溶解相的分析估算得出的。SML中PCBs的浓度高于底层水（ULW）中的浓度，富集因子（EF = C/C）高达一个数量级。采用方差分析统计方法评估采样设备之间大量数据（如溶解有机碳，DOC；颗粒有机碳，POC；悬浮颗粒物，SPM）的差异，同时使用双侧配对t检验来比较每个采样日期获得的富集情况。在这方面，尽管表面SS显示出较低的富集程度，可能是由于采样期间SML被ULW稀释，但在采样设备之间未发现显著不同的富集因子（p < 0.05）。就各种气象条件下的采样效率而言，MS似乎是测定SML中PCBs最合适的设备。
