厦门同安湾养殖海域有机锡化合物的污染历史及其来源分析

通过对厦门同安湾养殖海域沉积物柱样（柱深180 cm）中6种不同形态有机锡化合物（丁基锡和苯基锡）的GC-FPD定量分析测定,并结合210Pb同位素定年,追溯了该地区近几十年来有机锡污染的沉积历史（1931～2007年）.研究表明,该海域从20世纪50年代（0～80 cm段）开始出现有机锡化合物污染,总有机锡化合物的含...

Pollution History and Sources of Organotin Compounds in Aquaculture Water of Tong'an Bay, Xiamen

Six organotin compounds (OTs) in core sediment collected from aquaculture water of Tong'an Bay, Xiamen were detected by GC-FPD. Based on ²¹⁰Pb-dating data, the pollution history (from 1931 to 2007) of OTs in this area was reconstructed and their possible sources were also discussed. The results showed that the inputs of organotin compounds in this sea area began from 1950's (0-80 cm). The vertical concentrations of OTs ranged from 3.43-69.6 ng·g^-1 (dry weight), the mean value was 15.0 ng·g^-1. Butyltins concentrations ranged from 2.51-68.8 ng·g^-1 and the average concentration was 14.6 ng·g^-1 which accounted for 97.4% of total OTs, while phenyltins just accounted for 2.58%. It is indicated that the aquaculture waters of Tong'an Bay were mainly contaminated by butyltin compounds, inferring that they may come from the early antifouling paint of ships. The distributions of OTs concentrations and compositions may be related to the complex influence of the hydrodynamic conditions, antifouling paint leakages from ships and marine structures, and aquaculture. Compared to the other harbors and bays, the magnitude of OTs pollution in the sediment from Tong'an Bay was at the low midpoint on a global scale. Moreover, the sedimentary history showed that, vertical OTs distributions were in good agreement with the usage history of organotin compounds as antifouling paints and the changes of the major function regionalization in the surrounding area.