Hi Sarah,

Keeping the bottles as tight as possible without headspace (although presence of headspace wouldn't affect them as long as they are closed tight) would preserve your water samples for a while. Screw capped bottles from any of the suppliers would work fine. In our lab we store them in a glass bottles and are preserved very well.

Hope this will help

Tsigabu

==================================
Tsigabu A. Gebrehiwet, Graduate student
Western Michigan University, Department of Geosciences,
Stable Isotope Geochemistry Lab
Kalamazoo, MI-49008, 269 387 4992 (Lab)
269 387 5650 (Office)

----- Original Message -----
From: Sarah Grosshuesch <[log in to unmask]>
Date: Monday, May 22, 2006 8:09 pm
Subject: Re: [ISOGEOCHEM] Hydrogen Isotope water samples

> I am a graduate student researching hydrogen stable isotopes 
> within the 
> food web of an owl species.  In the process of planning for sample 
> collection, I am wondering what would be the best bottle for 
> storing 
> water samples until they are processed, which may be several 
> months. 
> About a 100 mL of water will be collected and stored in a freezer. 
> Which would be the best bottle for storage glass or high-density 
> polyethylene?  Also, what sort of bottle cap would be best to 
> avoid 
> evaporation, etc.  Any advice would be greatly appreciated.
> 
> Thanks,
> 
> David Grosshuesch
> 
> M.S. candidate
> Natural Resources Research Institute
> Univ. of Minnesota-Duluth
> 5013 Miller Trunk Hwy.
> Duluth, MN 55811
> 218-720-4382
> [log in to unmask]
>