Forensic Applications for 1,4-Dioxane and Solvent Stabilizers - Environmental Investigation and Remediation - page 431

Stabilizers of Perchloroethylene
Butoxymethyl oxirane

0.023 0.00029 20,000 5.87 25.549

<100

Cyclohexene oxide 0.0009 0.000015 — — —

<1

Perchloroethylene 99.98 0.9997 150 150 — —

Stabilizers of Dichloromethane
Nitromethane 1.0 0.0137 11,100 152 103

<100

1,4-Dioxane 1.9 0.0178 10,000,000 178,312 0.087

>10,000

Cyclohexane 0.21 0.0021 55 0.12 132,346

<1

1,3-Dioxolane 4.3 0.0488 10,000,000 487,945 0.032

>100,000

Dichloromethane 92.6 0.9175 17,000 15,598 — —

Notes: The values given here are rough approximations; the calculations that yielded these estimates do not account for the ~25% of oily wastes that accumulate in vapor degreaser still
bottoms.

a

Operating parameters for perchloroethylene and methyl chloroform vapor degreasers are from Tarrer et al. (1993); parameters for trichloroethylene and dichloromethane vapor degreasers
are inferred from data in USEPA (1977).

b

Enthalpy data are from Chickos and Acree (2003). Enthalpies of vaporization were not located for butoxymethyl oxirane or cyclohexene oxide. Where enthalpy data are not available,
enthalpy of vaporization can be calculated by using Antoine coefi cients with the method presented in the Handbook of Chemical Property Estimation Methods (Lyman et al., 1990);
however, Antoine coefi cients were also not located for these two compounds.

c

CF = Concentration factor from Table 1.26.

d

Where solvent concentration is 10 mg/L. Final stabilizer concentration in groundwater resulting from a spill of still bottoms is estimated to an order of magnitude without considering i ne-
grained storage or other fates of stabilizers in the subsurface.