Spongberg Alison L
Department of Earth, Ecological and Environmental Sciences, M.S. 604, University of Toledo, Toledo, Ohio 43606-3390, USA.
Rev Biol Trop. 2004 Dec;52 Suppl 2:11-22.
Thirty-one sediment samples collected from 1996-2003 from the Gulf of Nicoya estuary on the northwestern coast of Costa Rica, have been obtained for PCB analyses. This is part of the first study to evaluate the PCB contamination in coastal Costa Rica. Overall, the concentrations are low, especially when compared to sediments from more temperate climates and/or sediments from more heavily industrialized areas. Values average less than 3 ng/g dw sediment, however, a few samples contained up to 7 ng/g dw sediment. Sediments with the highest concentrations were located in the Punta Morales area, where muds were sampled from among mangrove roots. The Puntarenas samples had surprisingly low PCB concentrations, likely due to their sandy lithology. The congener distribution within the majority of the samples showed signs of either recent sources or lack of degradation. However, a few sites, specifically some of the inter-gulf islands and more remote samples had congener distributions indicative of airborne contaminants and/or degradation. Considering the presence of airborne PCBs in the Gulf of Papagayo to the north, the lack of airborne PCBs and more varied congener distribution in the Gulf of Nicoya estuary was surprising.
已获取了1996年至2003年期间从哥斯达黎加西北海岸尼科亚湾河口采集的31份沉积物样本，用于多氯联苯（PCB）分析。这是评估哥斯达黎加沿海地区多氯联苯污染的第一项研究的一部分。总体而言，浓度较低，尤其是与来自气候更温和地区的沉积物和/或工业化程度更高地区的沉积物相比。沉积物中多氯联苯的含量平均低于3纳克/克干重，不过，有几个样本的含量高达7纳克/克干重。浓度最高的沉积物位于莫拉莱斯角地区，在那里从红树林根部采集了淤泥样本。蓬塔雷纳斯的样本中多氯联苯浓度出奇地低，可能是由于其砂质岩性。大多数样本中的同系物分布显示出近期来源或缺乏降解的迹象。然而，一些地点，特别是一些海湾间岛屿和更偏远的样本，其同系物分布表明存在空气传播污染物和/或降解现象。考虑到北部帕帕加约湾存在空气传播的多氯联苯，尼科亚湾河口缺乏空气传播的多氯联苯且同系物分布更为多样，这令人惊讶。
