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Measurements of Hydrogen Sulfide (H2S) Using Ptr-ms: Calibration, Humidity Dependence, Inter-comparison and Results from Field Studies in an Oil and Gas Production Region : Volume 7, Issue 10 (29/10/2014)

By Li, R.

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Book Id: WPLBN0003999507
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: Measurements of Hydrogen Sulfide (H2S) Using Ptr-ms: Calibration, Humidity Dependence, Inter-comparison and Results from Field Studies in an Oil and Gas Production Region : Volume 7, Issue 10 (29/10/2014)  
Author: Li, R.
Volume: Vol. 7, Issue 10
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2014
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Geiger, F., Warneke, C., Sweeney, C., Gouw, J. D., Graus, M., Murphy, S. M.,...Pétron, G. (2014). Measurements of Hydrogen Sulfide (H2S) Using Ptr-ms: Calibration, Humidity Dependence, Inter-comparison and Results from Field Studies in an Oil and Gas Production Region : Volume 7, Issue 10 (29/10/2014). Retrieved from http://www.worldlibrary.in/


Description
Description: Chemical Sciences Division, Earth System Research Laboratory, National Oceanic and Atmospheric Administration, Boulder, CO 80305, USA. Natural gas production is associated with emissions of several trace gases, some of them classified as air toxics. While volatile organic compounds (VOCs) have received much attention, hydrogen sulfide (H2S) can also be of concern due to the known health impacts of exposure to this hazardous air pollutant. Here, we present quantitative, fast time-response measurements of H2S using proton-transfer-reaction mass-spectrometry (PTR-MS) instruments. An ultra-light-weight PTR-MS (ULW-PTR-MS) in a mobile laboratory was operated for measurements of VOCs and H2S in a gas and oil field during the Uintah Basin Winter Ozone Study (UBWOS) 2012 campaign. Measurements of VOCs and H2S by a PTR-MS were also made at the Horse Pool ground site in the Uintah Basin during UBWOS 2013. The H2S measurement by PTR-MS is strongly humidity dependent because the proton affinity of H2S is only slightly higher than that of water. The H2S sensitivity of PTR-MS ranged between 0.6–1.4 ncps ppbv−1 during UBWOS 2013. We compare the humidity dependence determined in the laboratory with in-field calibrations and determine the H2S mixing ratios for the mobile and ground measurements. The PTR-MS measurements at Horse Pool are evaluated by comparison with simultaneous H2S measurements using a PTR time-of-flight MS (PTR-ToF-MS) and a Picarro cavity ring down spectroscopy (CRDS) instrument for H2S / CH4. On average 0.6 ± 0.3 ppbv H2S was present at Horse Pool during UBWOS 2013. The correlation between H2S and methane enhancements suggests that the source of H2S is associated with oil and gas extraction in the basin. Significant H2S mixing ratios of up to 9 ppmv downwind of storage tanks were observed during the mobile measurements. This study suggests that H2S emissions associated with oil and gas production can lead to short-term high levels close to point sources, and elevated background levels away from those sources. In addition, our work has demonstrated that PTR-MS can make reliable measurements of H2S at levels below 1 ppbv.

Summary
Measurements of hydrogen sulfide (H2S) using PTR-MS: calibration, humidity dependence, inter-comparison and results from field studies in an oil and gas production region

Excerpt
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