Van Drooge B L, Grimalt J O, Torres-García C J, Cuevas E
Department of Environmental Chemistry, ICER-CSIC, Barcelona, Catalonia, Spain.
Mar Pollut Bull. 2001 Aug;42(8):628-34. doi: 10.1016/s0025-326x(01)00064-9.
Deposition samples were taken at a height of 2367 m above sea level (m.a.s.l.) on the Island of Tenerife from May 1999 until July 2000 and analysed for 19 polychlorinated biphenyl (PCB) congeners, hexachlorobenzene (HCB), hexachlorocyclohexanes (HCH) and DDTs. This site is located above the inversion layer, so samples represent background concentrations of the free troposphere. The average deposition fluxes of HCB, total HCH, DDTs and PCBs were 86, 400, 110 and 780 ng m(-2) yr(-1), respectively, being lower than those reported at sea level in continental or marine areas. All compounds are generally found in higher abundance in the wet precipitation samples. However, these samples only represent a fraction, e.g. 33%, of the total deposition load. Annual mass balance calculations show that wet precipitation is essentially responsible for the deposition of the low molecular weight OC whereas dry deposition accounts for more than 50% of the higher molecular weight PCBs.
1999年5月至2000年7月期间，在特内里费岛海拔2367米的高度采集了沉积样本，并对19种多氯联苯（PCB）同系物、六氯苯（HCB）、六氯环己烷（HCH）和滴滴涕进行了分析。该地点位于逆温层之上，因此样本代表了自由对流层的背景浓度。HCB、总HCH、滴滴涕和PCBs的平均沉积通量分别为86、400、110和780纳克/米²·年，低于大陆或海洋地区海平面报告的通量。所有化合物通常在湿沉降样本中的含量更高。然而，这些样本仅占总沉积负荷的一部分，例如33%。年度质量平衡计算表明，湿沉降基本上是低分子量有机氯沉积的原因，而干沉降占高分子量PCBs沉积的50%以上。
