Document Detail


Measurement of ambient hydroperoxides using an automated HPLC system and various factors which affect variations of their concentrations in Korea.
MedLine Citation:
PMID:  18181026     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An HPLC system was automated for the measurement of gaseous hydroperoxides in the ambient air. In this system, samples collected using a glass coil without a long sampling tube are injected automatically into HPLC. The analytical system is based on the post-column derivatization, which is a reaction of hydroperoxides with p-hydroxyphenyl acetic acid to produce a fluorescent dimer in the presence of horseradish peroxidase as an enzyme catalyst. The detection limits of hydrogen peroxide (H(2)O(2)) were from 0.018 to 0.042 ppbv. The gaseous hydroperoxides were measured in Gwangju during March, May and October 2002, and in Seoul during June 2002. H(2)O(2) concentrations were remarkably low and almost at the detection limit during a period of the yellow sand (Asian dust). These results might be strongly ascribed to the effect of Asian dust particles for heterogeneous loss of peroxides and partly loss of samples due to the storage of sample and analysis. Methyl hydroperoxide (CH(3)OOH) was identified and quantified only in Seoul. The highest concentrations of H(2)O(2) were 0.24, 2.84, and 0.89 ppbv during March, May, October, respectively in Gwangju, and 5.19 ppbv in Seoul. The concentration of CH(3)OOH was as high as 1.1 ppbv and sometimes its concentration was higher than that of H(2)O(2) in the early morning or in the late night. The variability of CH(3)OOH was lower than that of H(2)O(2). H(2)O(2) showed a positive relationship with O(3) (r = 0.54, P < 0.01 level; two-tailed), solar radiation (r = 0.61, P < 0.01 level; two-tailed), temperature (r = 0.66, P < 0.01 level; two-tailed), and a negative relationship with NO( x ) (r = -0.20, P < 0.05 level; two-tailed), and relative humidity (r = -0.58, P < 0.01 level; two-tailed) in Seoul. Thus, photochemical activity is considered an important factor in gaseous H(2)O(2) and CH(3)OOH distribution.
Authors:
Sang B Hong; Gyu S Kim; Chang H Kang; Jai H Lee
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-06
Journal Detail:
Title:  Environmental monitoring and assessment     Volume:  147     ISSN:  0167-6369     ISO Abbreviation:  Environ Monit Assess     Publication Date:  2008 Dec 
Date Detail:
Created Date:  2008-11-07     Completed Date:  2009-02-09     Revised Date:  2009-05-11    
Medline Journal Info:
Nlm Unique ID:  8508350     Medline TA:  Environ Monit Assess     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  23-34     Citation Subset:  IM    
Affiliation:
Department of Environmental Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 500-701, Republic of Korea.
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MeSH Terms
Descriptor/Qualifier:
Air Pollutants / analysis*
Chromatography, High Pressure Liquid / methods*
Hydrogen Peroxide / analysis*
Korea
Reproducibility of Results
Chemical
Reg. No./Substance:
0/Air Pollutants; 7722-84-1/Hydrogen Peroxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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