Spatial and temporal variation in CDOM and trace elements in eastern Australian ports Implications for verifying ballast water exchange by ships MAF Biosecurity New Zealand Technical Paper No: 2009/45 Prepared for BNZ Post-clearance Directorate by K. Murphy 1 , M. Doblin 2 , J. Boehme 1 and G. Ruiz 1 1. Smithsonian Environmental Research Center, USA 2. Institute for Water & Environmental Resource Management, University of Technology, Sydney ISBN 978-0-478-35758-5 (Print) ISBN 978-0-478-35759-2 (Online) ISSN 1176-838X (Print) ISSN 1177-6412 (Online) 12 December 2009