Dina Schwertfeger A , Jessica Velicogna A , Alexander Jesmer A , Heather McShane B , Richard Scroggins A and Juliska Princz A C B Department of Natural Resource Sciences, McGill University, 21 111 Lakeshore Road, Sainte Anne de Bellevue, QuA bec, H9X 3V9, Canada. Environmental Chemistry – http://dx.doi.org/10.1071/EN16136 Submitted: 30 July 2016 Accepted: 21 November 2016 Published online: 11 January 2017 Environmental context.