Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Remote North Atlantic Marine Atmosphere

Baker  JI; Hites  RA

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Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Remote North Atlantic Marine Atmosphere

机译：Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Remote North Atlantic Marine Atmosphere

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We have developed a sampling strategy that allows us to determine femtogram/cubic meter concentrations of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/F) in remote marine atmospheres. Using this sampling strategy, a total of 37 air samples were taken during two extended sampling periods at Bermuda between September 1993 and August 1997. During this time, the average total PCDD/F concentrations at Bermuda decreased from 105 plus or minus 30 to 35 plus or minus 10 fg/m super(3), giving a halflife of about 2 years for these compounds in the remote marine atmosphere. PCDD/F concentrations during both sampling periods were somewhat higher in the winter when air parcels originated from North America. A second airsampling station was established at Barbados where 22 air samples were taken between March 1996 and August 1997; an average total PCDD/F concentration at Barbados of 15 plus or minus 7 fg/m super(3) was found. This value was not significantly different than the 27 plus or minus 7 fg/m super(3) found at Bermuda during this time when air arrived from the east. This indicated that the remote marine background concentration for these compounds is currently on the order of 20 fg/m super(3). Using these background concentrations, the dry depositional rate of PCDD/F to the world's oceans was estimated to be 200 plus or minus 80 kg/year, and the wet depositional rate was estimated to be 900 plus or minus 300 kg/year. This is a total deposition rate of about 1 t/year to the oceans as compared to our previous estimate of 12 t/year PCDD/F deposition from the atmosphere to the land.

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《Environmental Science & Technology: ES&T》 |1999年第1期|0-0|共1页
作者
Baker JI; Hites RA;
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作者单位

School of Public and Environmental Affairs and Department of Chemistry, Indiana University, Bloomington, Indiana 47405;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类环境化学;
关键词
Air-water interactions; Dry deposition; Wet deposition; PCDD; PCDF; Marine environment;

Polychlorinated Dibenzo-p-dioxins and Dibenzofurans in the Remote North Atlantic Marine Atmosphere

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