Andy,
thanks for replying.  This could be what happened.  These samples were
shipped from Alaska and maybe we did not tighten them enough.  What a
pain....


On Sep 20, 2009, at 4:53 PM, Andrew Schauer wrote:
---------------------------------------------
Behzad Mortazavi, Ph.D.
Assistant Professor
Director of University of Alabama
M.S. Program in Marine Science
Dauphin Island Sea Laboratory
101 Bienville Blvd
Dauphin Island, AL 36528
251-861-2189 (Phone)
251-861-7540 (Fax)
[log in to unmask]




On Sep 20, 2009, at 4:53 PM, Andrew Schauer wrote:

> We used glass flasks with two teflon stopcocks for years for  
> atmospheric CO2 sampling. These flasks were transported via ground  
> and air shipping at all times of the year under a wide range of  
> pressures. The only time we noticed problems with an entire batch  
> was when they became so cold in the shipping process that the teflon  
> stopcocks shrank away from the glass sidewalls and were thus, open.  
> We verified this by putting some in the freezer. We started  
> tightening a bit more and it never happened again.
>
> andy
>
> Andrew Schauer
> Earth and Space Sciences
> University of Washington
> Seattle, WA 98195
>
>
> 206.543.6327
> [log in to unmask]
> http://depts.washington.edu/isolab/
>
>
>
> ----- Original Message ----
> From: Behzad Mortazavi <[log in to unmask]>
> To: [log in to unmask]
> Sent: Sunday, September 20, 2009 11:12:32 AM
> Subject: [ISOGEOCHEM] Glass Vials and Shipping
>
> Hello all,
> We have collected air samples with glass flasks with teflon seals and
> once shipped on a plane the CO2 conc and 13C values were off.  Do you
> guys have any suggestions or advice?
>
> I would appreciate the help.
> ---------------------------------------------
> Behzad Mortazavi
>