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Stable Isotope Geochemistry <[log in to unmask]>
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Andrea Lini <[log in to unmask]>
Date:
Fri, 12 Jun 1998 13:02:44 -0400
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Stable Isotope Geochemistry <[log in to unmask]>
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I have recently received the following e-mail. Can anybody help?
Please reply directly to Steve Grant: [log in to unmask]

Thanks!
Andrea

>Mime-Version: 1.0 (NeXT Mail 3.3 v118.2)
>From: Steve Grant <[log in to unmask]>
>Date: Tue,  2 Jun 98 18:30:18 +0200
>To: [log in to unmask]
>Subject: question
>Cc: [log in to unmask] (Ira P May)
>Reply-To: [log in to unmask]
>
>
>The chlorinated solvent trichloroethylene (C2HCl3; TCE) is a
>suspected human carcinogen and a ground-water contaminant at many
>current and formerly used Army facilities. (Chem Abs Reg No:
>79-07-6; MW 0.13139 kg/mol; m.p.-84.7 C; b.p 87.2 C; Henry's Law
>constant, 0.0071 bar m^3/mol; vapor pressure at 25 C, 9.8 kPa;
>aqueous solubility at 25 C 8.4 mmol/kg) TCE in the subsurface is
>thought to be partitioned between the gas phase, the aqueous
>solution phase,  isolated globules of separate organic liquid phase
>and the soil organic-matter solid phase.
>
>Remediation by vapor extraction from the vadoze zone above the
>water table is commonly employed to remove TCE from contaminated
>ground. At many sites the concentrations of TCE in the extracted
>vapors are higher than would be predicted by the concentrations of
>TCE in the soil solutions. The causes for these elevated TCE
>concentrations are unknown and of considerable interest to those
>responsible for environmental clean up. The condensed-phase source
>of the TCE in extracted vapor cannot be inferred from current
>measurements.
>
>Presumbably the isotopic abundances differ in gaseous TCE depending
>upon the condensed phase with which the gas is at equilibrium, that
>is whether the vapor is at equilibrium with aqueous solutions,
>pure-TCE liquids, or soil organic-matter sorbates.
>
>Could the condensed phase providing TCE to the vapor-extractant
>gases be inferred by the isotopic fractionation of the
>vapor-extracted TCE?
>
>Steve Grant                     office: 603-646-4446
>CRREL                              fax: 603-646-4561
>72 Lyme RD                      E-mail: [log in to unmask]
>Hanover NH 03755-1290 USA
>
>(Note: Do NOT reply to [log in to unmask], which is
>inside the CRREL ``firewall.'' Please reply to the E-mail address in
>the footer.)
>


================================================================
|    Dr. Andrea Lini           |  Stable Isotope Laboratory    |
|    Department of Geology     |  Phone: (802) 656 02 45       |
|    University of Vermont     |  Fax:   (802) 656 00 45       |
|    Burlington, VT 05405      |  E-mail:[log in to unmask]     |
|    U.S.A.                    |  ISOGEOCHEM  list-owner       |
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| ISOGEOCHEM URL: http://geology.uvm.edu/isogeochem.html       |
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