For testing the machine analytical procedure, NIST 981 or
NIST 982 will be best. If you need to test the sample
preparation aspect as well, you will need to get a silicate
standard such as BCR-2


-----Original Message-----
From: Stable Isotope Geochemistry
[mailto:[log in to unmask]] On Behalf Of Meredith
Benedict
Sent: Thursday, May 19, 2005 2:32 PM
To: [log in to unmask]
Subject: [ISOGEOCHEM] lead isotope standard


Hello I am working with lead isotopes from lake sediment
cores in my Master's research.  I need a lead isotope
standard or SRM that has Pb 204, 206, 207, and 208 for the
ICP-MS.  I have had trouble finding a standard that contains
all of the Pb isotopes I need through the web.  I have
looked at NIST and Fisher Scientific Website.  If you have
any suggestions of where else I could look to find this
standard it would be greatly appreciated.  Thanks.

Sincerely,
Meredith Benedict
Michigan State University