Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica
A three-year sampling campaign (Jan 2011-Jan 2014) was conducted on organochlorine pesticides (OCPs) using high-volume air sampling nearby the Chinese Great Wall Station, west Antarctica. The concentrations of Sigma(23)OCPs ranged between 5.87 and 27.9 pg m(-3) (mean 14.3 +/- 5.4 pg m(-3)), and no t...
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ftchacadscircees:oai:ir.rcees.ac.cn:311016/41065 2023-05-15T13:51:53+02:00 Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica Wang, Pu Meng, Wenying Li, Yingming Zhang, Qinghua Zhang, Lin Fu, Jianjie Yang, Ruiqiang Jiang, Guibin 2018-10-01 http://ir.rcees.ac.cn/handle/311016/41065 unknown ATMOSPHERIC ENVIRONMENT http://ir.rcees.ac.cn/handle/311016/41065 cn.org.cspace.api.content.CopyrightPolicy@57e00d26 Antarctica air Organochlorine pesticides Temporal variation Gas-particle partitioning Chiral signature Source implication Article 期刊论文 2018 ftchacadscircees 2020-12-22T10:25:32Z A three-year sampling campaign (Jan 2011-Jan 2014) was conducted on organochlorine pesticides (OCPs) using high-volume air sampling nearby the Chinese Great Wall Station, west Antarctica. The concentrations of Sigma(23)OCPs ranged between 5.87 and 27.9 pg m(-3) (mean 14.3 +/- 5.4 pg m(-3)), and no temporal trend was observed over the entire sampling period. However, the dominant compound, hexachlorobezene (HCB) (71% on average of Sigma(23)OCPs), exhibited a seasonal variation with higher levels in the austral winter. Gas-particle partitioning of OCPs was explored based on K-OA absorption model, steady-state model and Junge-Pankow adsorption model. LogK(p) showed significantly negative correlations with logP(L)(0) of OCPs (p < 0.01, the slope is -0.30) and TSP values in the samples (p < 0.01), suggesting absorption by the organic matter as the dominant sorption process and TSP as an important factor influencing gas-particle partitioning of OCPs in this remote environment. The chiral signature indicated a commonly nonracemic residue of alpha-HCH and o,p'-DDT in the Antarctic air. The deviation from racemic (DFR) of o,p'-DDT showed a strongly negative dependence on its concentration (p < 0.01), properly suggesting more fresh input of o,p'-DDT after 2011. Preferential depletion of (+) alpha-HCH was observed mainly in gas phase, indicating the influence of re-volatilization of chiral compounds from source areas and/or ocean on their enantiomeric composition in remote air. Source apportionment demonstrated that long range atmospheric transport (LRAT) was the main transport pathway of OCPs, while nonracemic residues of HCHs and DDTs indicated a contribution of secondary source emission, i.e. seawater-air exchange, to their occurrence in west Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica King George Island West Antarctica Research Center for Eco-Environmental Sciences: RCEES OpenIR (Chinese Academy of Sciences) Antarctic Austral Great Wall Station ENVELOPE(-58.970,-58.970,-62.217,-62.217) King George Island The Antarctic West Antarctica |
institution |
Open Polar |
collection |
Research Center for Eco-Environmental Sciences: RCEES OpenIR (Chinese Academy of Sciences) |
op_collection_id |
ftchacadscircees |
language |
unknown |
topic |
Antarctica air Organochlorine pesticides Temporal variation Gas-particle partitioning Chiral signature Source implication |
spellingShingle |
Antarctica air Organochlorine pesticides Temporal variation Gas-particle partitioning Chiral signature Source implication Wang, Pu Meng, Wenying Li, Yingming Zhang, Qinghua Zhang, Lin Fu, Jianjie Yang, Ruiqiang Jiang, Guibin Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
topic_facet |
Antarctica air Organochlorine pesticides Temporal variation Gas-particle partitioning Chiral signature Source implication |
description |
A three-year sampling campaign (Jan 2011-Jan 2014) was conducted on organochlorine pesticides (OCPs) using high-volume air sampling nearby the Chinese Great Wall Station, west Antarctica. The concentrations of Sigma(23)OCPs ranged between 5.87 and 27.9 pg m(-3) (mean 14.3 +/- 5.4 pg m(-3)), and no temporal trend was observed over the entire sampling period. However, the dominant compound, hexachlorobezene (HCB) (71% on average of Sigma(23)OCPs), exhibited a seasonal variation with higher levels in the austral winter. Gas-particle partitioning of OCPs was explored based on K-OA absorption model, steady-state model and Junge-Pankow adsorption model. LogK(p) showed significantly negative correlations with logP(L)(0) of OCPs (p < 0.01, the slope is -0.30) and TSP values in the samples (p < 0.01), suggesting absorption by the organic matter as the dominant sorption process and TSP as an important factor influencing gas-particle partitioning of OCPs in this remote environment. The chiral signature indicated a commonly nonracemic residue of alpha-HCH and o,p'-DDT in the Antarctic air. The deviation from racemic (DFR) of o,p'-DDT showed a strongly negative dependence on its concentration (p < 0.01), properly suggesting more fresh input of o,p'-DDT after 2011. Preferential depletion of (+) alpha-HCH was observed mainly in gas phase, indicating the influence of re-volatilization of chiral compounds from source areas and/or ocean on their enantiomeric composition in remote air. Source apportionment demonstrated that long range atmospheric transport (LRAT) was the main transport pathway of OCPs, while nonracemic residues of HCHs and DDTs indicated a contribution of secondary source emission, i.e. seawater-air exchange, to their occurrence in west Antarctica. |
format |
Article in Journal/Newspaper |
author |
Wang, Pu Meng, Wenying Li, Yingming Zhang, Qinghua Zhang, Lin Fu, Jianjie Yang, Ruiqiang Jiang, Guibin |
author_facet |
Wang, Pu Meng, Wenying Li, Yingming Zhang, Qinghua Zhang, Lin Fu, Jianjie Yang, Ruiqiang Jiang, Guibin |
author_sort |
Wang, Pu |
title |
Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
title_short |
Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
title_full |
Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
title_fullStr |
Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
title_full_unstemmed |
Temporal variation (2011-2014) of atmospheric OCPs at King George Island, west Antarctica |
title_sort |
temporal variation (2011-2014) of atmospheric ocps at king george island, west antarctica |
publishDate |
2018 |
url |
http://ir.rcees.ac.cn/handle/311016/41065 |
long_lat |
ENVELOPE(-58.970,-58.970,-62.217,-62.217) |
geographic |
Antarctic Austral Great Wall Station King George Island The Antarctic West Antarctica |
geographic_facet |
Antarctic Austral Great Wall Station King George Island The Antarctic West Antarctica |
genre |
Antarc* Antarctic Antarctica King George Island West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica King George Island West Antarctica |
op_relation |
ATMOSPHERIC ENVIRONMENT http://ir.rcees.ac.cn/handle/311016/41065 |
op_rights |
cn.org.cspace.api.content.CopyrightPolicy@57e00d26 |
_version_ |
1766255934156308480 |