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Direct measurement of trace elemental mercury in hydrocarbon matrices by gas chromatography with ultraviolet photometric detection

Citation

Gras, R and Luong, J and Shellie, RA, Direct measurement of trace elemental mercury in hydrocarbon matrices by gas chromatography with ultraviolet photometric detection, Analytical Chemistry, 87, (22) pp. 11429-11432. ISSN 0003-2700 (2015) [Refereed Article]

Copyright Statement

2015 American Chemical Society

DOI: doi:10.1021/acs.analchem.5b02895

Abstract

We introduce a technique for the direct measurement of elemental mercury in light hydrocarbons such as natural gas. We determined elemental mercury at the parts-per-trillion level with high precision [<3% RSD (n = 20 manual injection)] using gas chromatography with ultraviolet photometric detection (GC-UV) at 254 nm. Our approach requires a small sample volume (1 mL) and does not rely on any form of sample preconcentration. The GC-UV separation employs an inert divinylbenzene porous layer open tubular column set to separate mercury from other components in the sample matrix. We incorporated a 10-port gas-sampling valve in the GC-UV system, which enables automated sampling, as well as back flushing capability to enhance system cleanliness and sample throughput. Total analysis time is <2 min, and the procedure is linear over a range of 283 μg/m3 [correlation coefficient of R2 = 0.998] with a measured recovery of >98% over this range.

Item Details

Item Type:Refereed Article
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Gras, R (Ms Ronda Gras)
Author:Luong, J (Mr Jim Luong)
Author:Shellie, RA (Associate Professor Robert Shellie)
ID Code:105904
Year Published:2015
Web of Science® Times Cited:4
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2016-01-20
Last Modified:2016-05-17
Downloads:0

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