U.S. EPA Contaminated Site Cleanup Information (CLU-IN)


U.S. Environmental Protection Agency
U.S. EPA Technology Innovation and Field Services Division

Dense Nonaqueous Phase Liquids (DNAPLs)

Chemistry and Behavior

Halogenated Monoaromatics

Table 1 presents common physical/chemical properties of the profiled halogenated monoaromatics. While chlorobenzene is expected to be moderately to highly mobile in the subsurface, the other three are not. Chlorobenzene is not expected to bioaccumulate, but bioaccumulation is expected of the other three. All of the halogenated monoaromatics are subject to anaerobic biodegradation, but this degradation will be slow for 1,2-dichlorobenzene and 1,3-dichlorobenzene and likely will yield benzene as a final product. All of the halogenated monoaromatics can be degraded in an aerobic environment (Cohen and Mercer 1993).

For references and temperatures see individual chemical profiles

Table 1.
Common Physical/Chemical Properties of Selected Halogenated Monoaromatics
Chemical Specific Gravity (g/cc) Solubility (mg/L) Vapor Pressure (mmHg) Henry's Constant (atm-m3/mol) Log Koc Log Kow
Chlorobenzene 1.11 500 8.8 3.58 e-03 2.52 2.84
1,2-Dichlorobenzene 1.31 151 1.36 1.92 e-03 2.51 3.43
1,3-Dichlorobenzene 1.29 125 2.15 2.8 e-03 2.47 3.53
1,2,4-Trichlorobenzene 1.45 31.3 0.46 1.42 e-03 3.1 4.02

More information can be found in Table A-1Adobe PDF Logo of Cohen and Mercer 1993.

For Further Information

DNAPL Site Evaluation Adobe PDF Logo
Cohen, R. and J. Mercer. EPA 600-R-93-022, 369 pp, 1993