Now that I've hit the return button inadvertantly, let me clarify the problem.
I purchased the recommended Labco exetainer vials for the Finnigan Gasbench
II. They do not contain heparin, but they are coated with "silicone".
Upon adding DI water and shaking the vials, there is a foam or suds that
are not present if the vials are subsequently rinsed and shaken.
I've had results for 18O that are outside specification and 13C results
have been a little worse. I am currently running cleaned vials to see
whether this "foam", whatever it represents, is contributing to less than
desireable precision.
For the record, I originally intended to send a private message to Zach. I
had no intention of taking a public "shot" at Finnigan's products or
service engineers. The Gasbench II is a fairly new product and the
engineer who is on site has had,in relative terms, a lot of experience with
it.
Now, I will attempt to corral enough brain cells an use the reply button
properly.
>Dear Steve,
> You're not talking about "serum vials" are you? The ones that can contain
>Heparin for preventing blood clotting?
>
>regards,
>
>David Wilbur 206-685-9288
>Stable Isotope Lab 206-685-2366
>School of Oceanography 206-685-3351 fax
>Box 357940 [log in to unmask]
>Univ. of Washington
>Seattle, WA 98195-7940 USA
>http://www.ocean.washington.edu/people/staff/dowilbur/dowilbur.html
>
>
>----- Original Message -----
>From: Steve Nelson <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Wednesday, June 23, 1999 1:22 PM
>
>
>> >Suds! No.
>> >
>> >Zach
>>
>> Well, I bought 1,000 that are identical to the 200 that Finnigan shipped
>> with the machine. They all have some something [surfactant?] in them that
>> makes a nice little foam. It is in the vial--not the septum.
>>
>> I'm headed downstairs in a little while to try to pick out some samples.
>>
>>
>>
>> ********************************
>> Steve Nelson
>> Dept. of Geology
>> S389 ESC
>> Brigham Young University
>> Provo. Utah 84602
>>
>> voice: 1-801-378-8688
>> lab: 1-801-378-5124
>> FAX: 1-801-378-8143
>>
>> CONTROL, ALT, DELETE: the 3 most
>> frequently used keys on a PC.
>> *********************************
>>
********************************
Steve Nelson
Dept. of Geology
S389 ESC
Brigham Young University
Provo. Utah 84602
voice: 1-801-378-8688
lab: 1-801-378-5124
FAX: 1-801-378-8143
CONTROL, ALT, DELETE: the 3 most
frequently used keys on a PC.
*********************************
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