PMID- 17055554
OWN - NLM
STAT- MEDLINE
DCOM- 20070223
LR  - 20161124
IS  - 0048-9697 (Print)
IS  - 0048-9697 (Linking)
VI  - 372
IP  - 1
DP  - 2006 Dec 15
TI  - Gradient distribution of persistent organic contaminants along northern slope of 
      central-Himalayas, China.
PG  - 193-202
AB  - High mountains may serve as condenser for persistent organic pollutants (POPs) 
      and the vegetation in remote areas has been used as a means to characterized 
      atmospheric concentrations of air pollutants. In this study, organochlorine 
      pesticides (OCPs) and polycyclic aromatic hydrocarbons (PAHs) in Himalayan spruce 
      needle samples from Zhangmu-Nyalam region (central-Himalayas) were analyzed and 
      the altitudinal gradient of these pollutants was investigated. Total HCHs and 
      DDTs concentration in needles were in the range of 1.3-2.9 ng g(-1) dry weight 
      and 1.7-11 ng g(-1) dry weight, which were lower than concentrations reported in 
      spruce needles from Alps, however higher than concentrations in conifer needles 
      from mountain areas of Alberta. Total Himalayan spruce needle PAHs was below 600 
      ng g(-1) and fluorene, phenanthrene and acenaphthene were abundant individual 
      compounds measured. The ratios of alpha-HCH/gamma-HCH in pine needles were 
      similar with the usual values for technical HCH, implying technical HCHs might be 
      used in this region. The high ratios of o-p'-DDT/p-p'-DDT and no p-p'-DDE 
      measured in this study led to the suspicion that a new source of o-p'-DDT and/or 
      p-p'-DDT existed in this region. In addition, higher ratios of low molecular 
      weight-/high molecular weight-PAHs in this region indicated that petroleum 
      combustion, vehicle emission and low-temperature combustion might be the major 
      contributions of PAH source. To examine the POPs distillation, the analyte 
      concentrations were correlated with altitude. The more volatile OCPs, alpha-HCH, 
      gamma-HCH, aldrin and alpha-endosulfan positively correlated with altitude, 
      however, less volatile OCPs (DDT and DDD) inversely related with elevation. 
      Almost all PAHs detected in this area showed positive correlations with altitude. 
      It is worthy to note that heavy PAHs (Benzo[k] fluoranthene and 
      Benzo[a]anthracene) displayed positive correlation, which implied the sources of 
      PAHs were near the sampling sites. The distillation of POPs was strongly affected 
      by the proximity between sampling sites and contaminant sources. If the 
      contaminant sources are close to the mountains, it may be the dominant factor 
      that controls the concentration gradient.
FAU - Wang, Xiao-Ping
AU  - Wang XP
AD  - Institute of Tibetan Plateau Research, Chinese Academy of Sciences, PO Box 2871, 
      Beijing 100085, China. wangxp@itpcas.ac.cn
FAU - Yao, Tan-Dong
AU  - Yao TD
FAU - Cong, Zhi-Yuan
AU  - Cong ZY
FAU - Yan, Xing-Liang
AU  - Yan XL
FAU - Kang, Shi-Chang
AU  - Kang SC
FAU - Zhang, Yong
AU  - Zhang Y
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20061020
PL  - Netherlands
TA  - Sci Total Environ
JT  - The Science of the total environment
JID - 0330500
RN  - 0 (Air Pollutants)
RN  - 0 (Hydrocarbons, Chlorinated)
RN  - 0 (Pesticides)
RN  - 0 (Polycyclic Aromatic Hydrocarbons)
SB  - IM
MH  - Air Pollutants/*analysis
MH  - Altitude
MH  - China
MH  - Environmental Monitoring
MH  - Hydrocarbons, Chlorinated/*analysis
MH  - Pesticides/*analysis
MH  - Picea/*chemistry
MH  - Plant Leaves/chemistry
MH  - Polycyclic Aromatic Hydrocarbons/*analysis
EDAT- 2006/10/24 09:00
MHDA- 2007/02/24 09:00
CRDT- 2006/10/24 09:00
PHST- 2006/03/15 00:00 [received]
PHST- 2006/08/18 00:00 [revised]
PHST- 2006/09/06 00:00 [accepted]
PHST- 2006/10/24 09:00 [pubmed]
PHST- 2007/02/24 09:00 [medline]
PHST- 2006/10/24 09:00 [entrez]
AID - S0048-9697(06)00695-4 [pii]
AID - 10.1016/j.scitotenv.2006.09.008 [doi]
PST - ppublish
SO  - Sci Total Environ. 2006 Dec 15;372(1):193-202. doi: 
      10.1016/j.scitotenv.2006.09.008. Epub 2006 Oct 20.