Ph.D. Research Profile: Angelique Scott
Source apportionment and chemical characterisation of fine particles in Christchurch
The objective of the thesis is to characterise winter and summertime sources of fine particulate matter (PM2.5) in Christchurch. An assessment of the contribution of sources to ground level 24-hour average PM2.5 concentrations will be undertaken and a comparison made between source contributions to emissions (as obtained by emission inventories) and contributions to concentrations (determined by this study).
Air quality samples are currently being collected on a 24-hour basis at a residential monitoring site at Coles Place in St Albans. Samples were collected for the summer period from November 2001 to March 2002. Wintertime sampling commenced in May 2002.
Two samples are collected on filters simultaneously over a 24-hour period using a Speciated Air Sampling System (SuperSASS). The first filter is weighed to assess gravimetric mass and then analysed by Proton Induced X-Ray Emission to determine elemental composition. Filters contained in the second canister are analysed for water-soluble ions by the ion chromatography method.
Statistical analysis will be undertaken to assess the distribution of chemical species and receptor models applied to determine "elemental fingerprints" of each individual source. Whilst Principle Components Analysis will be applied initially it is envisaged that further analysis will be conducted using the Positive Matrix Factorisation technique to determine sources and their contribution to concentrations.
The results of this study may be used to support emission inventory results, indicate seasonal contributions of anthropogenic and natural emissions to concentrations, and provide baseline data to assist with monitoring impacts of emission reduction strategies over time.
Supervisor
Prof Andy Sturman
Department of Geography
Co-Supervisors
Dr Simon Kingham
Dr Peyman Zawar-Reza
Department of Geography