Debashish, Dried blood via EA-IRMS will require amounts similar to that used for protein like samples, such as hair or muscle. Bear plasma that we analyzed here was 46% C and 12%N. We have used masses of 0.3-0.6 mg for freeze dried blood. Cheers, Ben Harlow Washington State University Stable Isotope Core Laboratory ________________________________ From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf Of MAZUMDER, Debashish Sent: Monday, February 26, 2007 9:55 PM To: [log in to unmask] Subject: Re: [ISOGEOCHEM] Blood samples Dear All I like to analyse stable C and N signatures from bat blood samples. How much blood we need to analyse stable C and N values? I would appreciate if you please provide me information (any reference) on methods relating to this. Thanks you in advance Kind regards Debashish Debashish Mazumder, PhD Post-doctoral Research Fellow Institute for Environmental Research Australian Nuclear Science & Technology Organisation (ANSTO) PMB 1, Lucas Heights Menai 2234, New South Wales AUSTRALIA Phone: +61 2 9717 9219 Fax: +61 2 9717 9260 Email: [log in to unmask] "Important: This transmission is intended only for the use of the addressee. It is confidential and may contain privileged information or copyright material. If you are not the intended recipient, any use or further disclosure of this communication is strictly forbidden. If you have received this transmission in error, please notify me immediately by telephone and delete all copies of this transmission as well as any attachments".