Hi all, i was wondering why no one uses HCl for extraction of dissolved inorganic carbon from water for measuring d13C. At first glance it should be more suitable than H3PO4 since you don't have to expect O exchange from acid to evolved CO2. But I guess there must be a reason.... thx Chris -- Please consider the environment before printing this e-mail *University of Tasmania │CSL - Isotope Ratio Mass Spectrometry* Dr. Christian Dietz, Facility Manager *│*Private Bag 74, Hobart, 7005 Tasmania ( Tel: (+61) 3 6226 7820, cell phone: (+61) 4 9780 8570 *│*URL: Central Science Laboratory <http://www.utas.edu.au/research/central-science-laboratory> This message is intended exclusively for its adressee and may contain information that is CONFIDENTIAL and protected by professional privilege. If you are not the intended recipient you are hereby notified that any dissemination, copy or disclosure of this communication is strictly prohibited by law. If this message has been received in error, please immediately notify us via e-mail and delete.