1. Research Associate, School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, UK; Baxters Food Group, Fochabers, UK
2. Professor, Environmental Geochemistry, School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, UK
3. Lecturer, School of Health and Life Sciences, University of the West of Scotland, Paisley, UK
4. Director, European Supply Chain & Fochabers Site, Baxters Food Group, Fochabers, UK
5. Manager, Environmental Waste, Baxters Food Group, Fochabers, UK
6. Senior Lecturer in Environmental Chemistry, School of Computing, Engineering and Physical Sciences, University of the West of Scotland, Paisley, UK (corresponding author: )