PMID- 29253772
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20180330
LR  - 20180330
IS  - 1879-1026 (Electronic)
IS  - 0048-9697 (Linking)
VI  - 624
DP  - 2018 May 15
TI  - Long-term trends of atmospheric organochlorine pollutants and polycyclic aromatic 
      hydrocarbons over the southeastern Tibetan Plateau.
PG  - 241-249
LID - S0048-9697(17)33566-0 [pii]
LID - 10.1016/j.scitotenv.2017.12.140 [doi]
AB  - Long-term monitoring in remote regions is essential for revealing pollution 
      trends at the global scale but relevant studies remain limited. In the present 
      study, a six-year continuous monitoring of atmospheric persistent organic 
      pollutants (POPs) and polycyclic aromatic hydrocarbons (PAHs) was carried out at 
      Lulang in the southeastern Tibetan Plateau (TP). Average concentrations of 
      hexachlorocyclohexanes (HCHs), hexachlorobenzene (HCB), 
      dichlorodiphenyltrichloroethanes (DDTs), polychlorinated biphenyls (PCBs) and 
      PAHs were 13.5, 8.9, 41.7, 1.8pg/m(3) and 6.2ng/m(3), respectively. Obvious 
      seasonality was found for all the target compounds. HCHs, DDTs and PCBs had their 
      highest concentrations in summer (monsoon season) and lowest in winter, which is 
      consistent with the fluctuation of the Indian monsoon. Meanwhile, HCB and 
      5-6-ring PAHs showed opposite variations, possibly induced by local sources and 
      the westerly flow in winter. Declining trends were observed for most of the 
      chemicals, except o,p'-DDE, HCB and PCBs. A declining trend in the alpha/gamma-HCH ratio 
      indicated a shift from technical HCHs to lindane. An increasing trend in the 
      o,p'/p,p'-DDT ratio suggested a likely shift from technical DDTs to dicofol. For 
      PAHs, the contribution from high-temperature combustion has increased recently. 
      The half-lives of alpha-HCH, gamma-HCH, o,p'-DDT, p,p'-DDT were 6.1, 108, 77.6 and 
      14.2years, respectively. The half-lives of gamma-HCH, o,p'-DDT and p,p'-DDT were 
      higher than those in the Arctic, indicating these compounds will persist in the 
      TP for a longer period. The temporal trends in atmospheric POPs were possibly 
      induced by emissions in India and likely driven by wind speed in Lulang. This 
      study contributes toward a better understanding of the behavior and transport of 
      POPs in the TP region.
CI  - Copyright (c) 2017 Elsevier B.V. All rights reserved.
FAU - Wang, Chuanfei
AU  - Wang C
AD  - Key Laboratory of Tibetan Environment Changes and Land Surface Processes, 
      Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 
      100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, 
      Beijing, 100101, China.
FAU - Wang, Xiaoping
AU  - Wang X
AD  - Key Laboratory of Tibetan Environment Changes and Land Surface Processes, 
      Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 
      100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, 
      Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing 
      100049, China. Electronic address: wangxp@itpcas.ac.cn.
FAU - Gong, Ping
AU  - Gong P
AD  - Key Laboratory of Tibetan Environment Changes and Land Surface Processes, 
      Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 
      100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, 
      Beijing, 100101, China.
FAU - Yao, Tandong
AU  - Yao T
AD  - Key Laboratory of Tibetan Environment Changes and Land Surface Processes, 
      Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 
      100101, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, 
      Beijing, 100101, China.
LA  - eng
PT  - Journal Article
DEP - 20171215
PL  - Netherlands
TA  - Sci Total Environ
JT  - The Science of the total environment
JID - 0330500
OTO - NOTNLM
OT  - Half-life
OT  - Persistent organic pollutants
OT  - Temporal trend
OT  - Tibetan Plateau
EDAT- 2017/12/19 06:00
MHDA- 2017/12/19 06:01
CRDT- 2017/12/19 06:00
PHST- 2017/10/23 00:00 [received]
PHST- 2017/12/12 00:00 [revised]
PHST- 2017/12/12 00:00 [accepted]
PHST- 2017/12/19 06:00 [pubmed]
PHST- 2017/12/19 06:01 [medline]
PHST- 2017/12/19 06:00 [entrez]
AID - S0048-9697(17)33566-0 [pii]
AID - 10.1016/j.scitotenv.2017.12.140 [doi]
PST - ppublish
SO  - Sci Total Environ. 2018 May 15;624:241-249. doi: 10.1016/j.scitotenv.2017.12.140. 
      Epub 2017 Dec 15.