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Development of a chemiluminescence t...

Zheng, Jun.

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Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere./
Author:	Zheng, Jun.
Description:	123 p.
Notes:	Advisers: Minghua Zhang; Judith Lloyd.
Contained By:	Dissertation Abstracts International66-06B.
Subject:	Physics, Atmospheric Science. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3179662
ISBN:	9780542202865

Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere.
Zheng, Jun.

Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere. - 123 p.

Advisers: Minghua Zhang; Judith Lloyd.

Thesis (Ph.D.)--State University of New York at Stony Brook, 2004.

HOx (HO2 + OH) species play a key role in the photochemical production of the ground level O3, which causes serious health problems to the human being and damages our ecosystems. In situ observations of these trace species present a great challenge to the atmospheric chemistry community for their extreme low concentrations and high reactivity. We developed a new chemiluminescence method based on CLA ( Cypridina Luciferin Analogs) + HO2/O2 - reaction for the real time measurement of HO2 radical with a flow injection analysis system. This technique has the advantage of simplicity and is specific for HO2 without any severe interference. Our prototype instrument has a detection limit of 0.74 ppty and is currently set up to produce one 6 s averaged data point every two minutes. We used 60Co gamma-ray radiation of sodium formate solution as the primary HO2 calibration method and also built a gas phase HO2 calibrator based on the photolysis of H2O in the presence of CO and O2.

ISBN: 9780542202865Subjects--Topical Terms:

1019431
Physics, Atmospheric Science.

Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere.
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020 $a 9780542202865
035 $a (UMI)AAI3179662
035 $a AAI3179662
040 $a UMI $c UMI
100 1 $a Zheng, Jun. $3 1067170
245 1 0 $a Development of a chemiluminescence technique for hydroperoxyl radical measurement in the troposphere.
300 $a 123 p.
500 $a Advisers: Minghua Zhang; Judith Lloyd.
500 $a Source: Dissertation Abstracts International, Volume: 66-06, Section: B, page: 3184.
502 $a Thesis (Ph.D.)--State University of New York at Stony Brook, 2004.
520 $a HOx (HO2 + OH) species play a key role in the photochemical production of the ground level O3, which causes serious health problems to the human being and damages our ecosystems. In situ observations of these trace species present a great challenge to the atmospheric chemistry community for their extreme low concentrations and high reactivity. We developed a new chemiluminescence method based on CLA ( Cypridina Luciferin Analogs) + HO2/O2 - reaction for the real time measurement of HO2 radical with a flow injection analysis system. This technique has the advantage of simplicity and is specific for HO2 without any severe interference. Our prototype instrument has a detection limit of 0.74 ppty and is currently set up to produce one 6 s averaged data point every two minutes. We used 60Co gamma-ray radiation of sodium formate solution as the primary HO2 calibration method and also built a gas phase HO2 calibrator based on the photolysis of H2O in the presence of CO and O2.
520 $a From August 26 to September 6, 2003, we conducted a field experiment at the Whiteface Mt. (WFM) site. HO2 was measured side by side with other trace gases and other meteorology parameters. We observed that HO2 basically followed the solar cycle and normally ranged from near zero ppty in the morning and evening to around 10 ppty at noon, except on August 29, when 50 ppty HO2 was observed during an aged Ohio power plant plume event (68 ppbv O3, 3 ppbv NOy, and 9 ppbv SO2 were observed). Because the observation site was often experiencing cloudy weather, an accurate estimate of HO2 for comparison is not possible for this study. But we conducted a NOx sensitivity test under vary isoprene backgrounds with the free radical production held constant. The results agreed with the real measurements. Both of them showed that HO2 was insensitive to NOx (<0.6 ppbv) first and then dramatically decreased with NOx
590 $a School code: 0771.
650 4 $a Physics, Atmospheric Science. $3 1019431
690 $a 0608
710 2 $a State University of New York at Stony Brook. $3 1019194
773 0 $t Dissertation Abstracts International $g 66-06B.
790 $a 0771
790 1 0 $a Lloyd, Judith, $e advisor
790 1 0 $a Zhang, Minghua, $e advisor
791 $a Ph.D.
792 $a 2004
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3179662