Dense Nonaqueous Phase Liquids (DNAPLs)
Detection and Site Characterization
- Overview
- Policy and Guidance
- Chemistry and Behavior
- Environmental Occurrence
- Toxicology
- Detection and Site Characterization
- Treatment Technologies
- Conferences and Seminars
- Additional Resources
Halogenated Monoaromatics
Chlorobenzene
Chlorobenzene is a volatile halogenated organic and as such is subject to most standard characterization and analytical techniques used on this class of chemicals. Methods such as vertical profiling, dyes, membrane interface probe, and standard GC/MS are discussed in the main section for DNAPLs detection and site characterization.
Diffusion Samplers
Chlorobenzene-contaminated groundwater can be sampled by diffusion samplers (ITRC 2004).
Laboratory Methods
Analysis of chlorobenzene can be performed using standard analyses such as SW-846 methods 8021b
,
8260b, and 8260c.
A discussion of laboratory analytical methods for this compound is available in the Hazardous Substances Data Bank (HSDB) record for chlorobenzene under Laboratory Methods.
Field Screening Methods
Chlorobenzene should be detectable using headspace analysis with a field GC. Standards should be run to verify detection limit requirements. If using a PID detector, the photoionization value for chlorobenzene is 9.07 eV (EPA 1994).
Draeger offers a gas sampling tube that is sensitive to chlorobenzene in the 5 to 200 ppm range.
Chlorobenzene should be detectable in air by FTIR open-path spectroscopy (Robertson and Dunbar 2005).
References
Chlorobenzene, CASRN: 108-90-7
Hazardous Substances Data Bank (HSDB)
TOXNET, National Library of Medicine Web site.
Guidance for Evaluating Landfill Gas Emissions from Closed or Abandoned Facilities
Robertson, T. and J. Dunbar.
EPA 600-R-05-123a, 217 pp, 2005
This report discusses the use of FTIR open-path spectroscopy to detect chemicals in the air, including chlorobenzene.
Standard Operating Procedure# 2114: Photoionization Detector HNU
U.S. EPA, Emergency Response Team, 16 pp, 1994
This document contains an extensive list of chemicals with their photoionization potentials.
Technical and Regulatory Guidance for Using Polyethylene Diffusion Bag Samplers to Monitor Volatile Organic Compounds in Groundwater
Interstate Technology & Regulatory Council (ITRC). DSP-3, 78 pp, 2004.
Test Methods for Evaluating Solid Waste, Physical/Chemical Methods
U.S. EPA, SW-846 on line.
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