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Title: Measurement of dissolved H2, O2, and CO2 in groundwater using passive samplers for gas chromatographic analyses

Abstract

A simple in-situ passive dissolved gas groundwater sampler, comprised of a short length of silicone tubing attached to a gastight or other syringe, was adapted and tested for in-situ collection of equilibrium gas samples. Sampler retrieval after several days of immersion in groundwater allowed the direct injection of the sample onto a gas chromatograph (GC), simplifying field collection and sample handling over the commonly used 'bubble stripping' method for H{sub 2} analyses. A GC was modified by sequencing a thermal conductivity (TC) detector followed by a reductive gas (RG) detector so that linear calibration of H{sub 2} over the range 0.2-200,000 ppmv was attained using a 0.5-mL gas sample; inclusion of the TC detector allowed the simultaneous quantification of other fixed gases (O{sub 2}, CO{sub 2}, He, and Ne) to which the RG detector was not responsive. Uptake kinetics for H{sub 2} and He indicated that the passive sampler reached equilibrium within 12 h of immersion in water. Field testing of these passive samplers revealed unusually large equilibrium gas-phase H{sub 2} concentrations in groundwater, ranging from 0.1 to 13.9%, by volume, in 11 monitoring wells surrounding four former radiological wastewater disposal ponds at the Y-12 plant in Oak Ridge, Tennessee.

Authors:
 [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
986454
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Environmental Science & Technology
Additional Journal Information:
Journal Volume: 40; Journal Issue: 24; Journal ID: ISSN 0013-936X
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CALIBRATION; GASES; GROUND WATER; KINETICS; MONITORING; PONDS; SAMPLERS; SILICONES; TENNESSEE; TESTING; THERMAL CONDUCTIVITY; WATER; Y-12 PLANT

Citation Formats

Spalding, Brian Patrick, and Watson, David B. Measurement of dissolved H2, O2, and CO2 in groundwater using passive samplers for gas chromatographic analyses. United States: N. p., 2006. Web. doi:10.1021/es0613310.
Spalding, Brian Patrick, & Watson, David B. Measurement of dissolved H2, O2, and CO2 in groundwater using passive samplers for gas chromatographic analyses. United States. doi:10.1021/es0613310.
Spalding, Brian Patrick, and Watson, David B. Sun . "Measurement of dissolved H2, O2, and CO2 in groundwater using passive samplers for gas chromatographic analyses". United States. doi:10.1021/es0613310.
@article{osti_986454,
title = {Measurement of dissolved H2, O2, and CO2 in groundwater using passive samplers for gas chromatographic analyses},
author = {Spalding, Brian Patrick and Watson, David B},
abstractNote = {A simple in-situ passive dissolved gas groundwater sampler, comprised of a short length of silicone tubing attached to a gastight or other syringe, was adapted and tested for in-situ collection of equilibrium gas samples. Sampler retrieval after several days of immersion in groundwater allowed the direct injection of the sample onto a gas chromatograph (GC), simplifying field collection and sample handling over the commonly used 'bubble stripping' method for H{sub 2} analyses. A GC was modified by sequencing a thermal conductivity (TC) detector followed by a reductive gas (RG) detector so that linear calibration of H{sub 2} over the range 0.2-200,000 ppmv was attained using a 0.5-mL gas sample; inclusion of the TC detector allowed the simultaneous quantification of other fixed gases (O{sub 2}, CO{sub 2}, He, and Ne) to which the RG detector was not responsive. Uptake kinetics for H{sub 2} and He indicated that the passive sampler reached equilibrium within 12 h of immersion in water. Field testing of these passive samplers revealed unusually large equilibrium gas-phase H{sub 2} concentrations in groundwater, ranging from 0.1 to 13.9%, by volume, in 11 monitoring wells surrounding four former radiological wastewater disposal ponds at the Y-12 plant in Oak Ridge, Tennessee.},
doi = {10.1021/es0613310},
journal = {Environmental Science & Technology},
issn = {0013-936X},
number = 24,
volume = 40,
place = {United States},
year = {2006},
month = {10}
}