ISOGEOCHEM Archives

Stable Isotope Geochemistry

ISOGEOCHEM@LIST.UVM.EDU

Options: Use Forum View

Use Monospaced Font
Show Text Part by Default
Condense Mail Headers

Message: [<< First] [< Prev] [Next >] [Last >>]
Topic: [<< First] [< Prev] [Next >] [Last >>]
Author: [<< First] [< Prev] [Next >] [Last >>]

Print Reply
Received:
from mail.tamu.edu (MAIL.TAMU.EDU [128.194.103.4]) by list.uvm.edu (AIX4.2/UCB 8.7/8.7) with SMTP id KAA13848 for <[log in to unmask]>; Fri, 30 Aug 1996 10:13:42 -0400 (EDT) from geopsun.tamu.edu (GEOPSUN.TAMU.EDU [128.194.195.16]) by mail.tamu.edu (8.6.9/8.6.10) with SMTP id JAA21510 for <[log in to unmask]>; Fri, 30 Aug 1996 09:15:18 -0500 from [128.194.195.199] by geopsun.tamu.edu (4.1/SMI-4.1) id AA08042; Fri, 30 Aug 96 09:13:02 CDT
Content-Type:
text/plain; charset="us-ascii"
TO:
Date:
Thu, 29 Aug 1996 21:16:38 -0500
Subject:
From:
[log in to unmask] (Ethan L. Grossman)
Mime-Version:
1.0
X-Sender:
Message-Id:
<v01530500ae4bf7ae5504@[128.194.195.199]>
Parts/Attachments:
text/plain (30 lines)
Steve:

I assume you are running your samples by acidification in vacuo rather than
by  SrCO3 precipitation.  We fill 118 mL bottles, poison the water with 0.5
mL of saturated HgCl2 solution, and cap the bottles with Poly-seal (cone)
caps.  Samples are kept refrigerated until analysis.  Smaller bottles are
okay.  Just proportion the HgCl2 solution accordingly.  We get the best
results if we strip the CO2 within a couple of weeks of collection.
Collect some replicates as isotopic drift will occur when trying to
resample the same bottle, especially if some time has passed.  By the way,
we have found that poisoning is not necessary for groundwater samples (as
long as we strip them within a couple of weeks).

Bear in mind that the d13C of DIC in nearshore environments can be highly
variable and difficult to characterize precisely without a comprehensive
sampling program (see Weber and Woodhead, 1971, Geochim. Cosmochim. Acta
35:891; and Patterson and Walter, 1994, Geology 22:885).  Good luck with
your study.

Regards,

Ethan

Department of Geology & Geophysics                  (409) 845-0637
Texas A&M University                            fax (409) 845-6162
College Station, TX 77843




ATOM RSS1 RSS2