Have you tried CK gas (www.ckgas.com), they are a distributor of Cambridge isotope laboratories here in the UK.
Dr Nicholas Morley
Institute of Biological and Environmental Sciences,
University of Aberdeen, Cruickshank Building
St Machar Drive Aberdeen AB24 3UU, UK
Tel: +44(0)1224 272698
From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of Felicity Shelley
Sent: 24 January 2013 15:14
To: [log in to unmask]
Subject: [ISOGEOCHEM] 13C-CH4
Does anyone know where you can buy small volumes (1L tank) of 13-labelled methane from? In the past we've had it from Sigma but they're having "compliance issues" and so can't say when or if they'll ever be able to supply it.
The University of Aberdeen is a charity registered in Scotland, No SC013683.