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Gaseous oxidised mercury compounds captured by membrane technologies at two Australian sites

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posted on 28.03.2022, 14:20 authored by Dan Sawyer
Mercury (Hg) is a significant environmental pollutant, due its detrimental effects on both humans and ecosystems. The atmosphere is the largest natural pathway for global mercury distribution, and so understanding atmospheric mercury transport is of primary importance. Both the physical and chemical properties of gaseous oxidised mercury (GOM) in the atmosphere are poorly understood. Nylon and cation-exchange membranes have recently been pioneered as measurement tools for GOM. This study measured GOM using nylon and cation-exchange membranes at 2 sites in South Eastern Australia. One site, the Macquarie University campus, is located within an urban and industrial zone. The other, Cape Grim, is a rural site located far from urban or industrial environments. The ambient concentrations of GOM were analysed at both sites, and speciation data was analysed at Cape Grim. Values from both sites were examined for correlations with a variety of meteorological conditions. Higher average concentrations were observed at the Macquarie University site (20.2pg m-3, σ=5.4) than at Cape Grim (15.7pg m-3, σ=4.7) (P = 00348). A possible negative correlation was observed at both sites with relative humidity, in line with previous observations. Initial GOM speciation at Cape Grim using nylon membranes indicated the presence of Hg(NO3)2 and Hg(SO)4, with little evidence of HgCl2, HgBr2 or HgO.

History

Table of Contents

1. Introduction -- 2. Literature review -- 3. Methods -- 4. Results and discussion -- 5. Key findings and conclusion -- 6. References.

Notes

Theoretical thesis. Bibliography: pages 43-49

Awarding Institution

Macquarie University

Degree Type

Thesis MRes

Degree

MRes, Macquarie University, Faculty of Faculty of Science, Department of Environmental Sciences

Department, Centre or School

Department of Environmental Sciences

Year of Award

2016

Principal Supervisor

Grant Edwards

Rights

Copyright Dan Sawyer 2016. Copyright disclaimer: http://mq.edu.au/library/copyright.

Language

English

Jurisdiction

Australia

Extent

1 online resource (v, 49 pages)

Former Identifiers

mq:70200 http://hdl.handle.net/1959.14/1261236