health and safety plan solid waste management unit assessment

ETHYLENE GLYCOL 43-6
TABLE 43-1
EQUILIBRIUM PARTITIONING CALCULATIONS FOR ETHYLENE GLYCOL
IN MODEL ENVIRONMENTSa
Estimated Percent
Soil pf Tm.d&w of Chadcal in Each ComarmQllf;
nt Soil Soil w Water
Soil m &ir
Unsaturated
tops@&
25-c
at
Saturated
deep soild
0.4 99.6 7 x lo-'
8 x 10-s 99.99 e
a) Calculations based on Mackay's equilibrium partitioning model
(34,35,36); see Introduction in Volume 1 for description of model
and environmental conditions chosen to represent an unsaturated
topsoil and saturated deep soil. Calculated percentages should be
considered as rough estimates and used only for general guidance.
b) Utilized estimated soil sorption coefficient: Koc - 0.02.
cl Henry's law constant taken as 6 x 10-8 atm*m3/mol at 25-C (966).
d) Used sorption coefficient K - 0.001 Koc.
P
Lokke (862) studied the adsorption and leaching of ethylene glycol
in subsoils. No adsorption was observed for ethylene glycol (0.1-90
n&L) onto two sandy soils' 'and one clay subsoil ranging from O.l-0.2%
organic carbon. Leaching studies performed with soil cores of sandy
till showed that ethylene glycol (150-220 g/L) closely followed the
movement of water with little or no retardation.
43.2.1.3 Volatilization from Soils
Transport of ethylene glycol vapors through the air-filled pores
of unsaturated soils may occur in near-surface soils. However, modeling
results suggest that an insignificant fraction of the ethylene
glycql loading will be present in the soil-air phase.
In general, important soil and environmental properties influ-
,encing the rate of volatilization include soil porosity, temperature,
convection currents and barometric pressure changes; important physicochemical
properties include the Henry's law constant, the vapor-soil
sorption coefficient, and, t.o the lesser extent, the vapor phase
diffusion coefficient (31).
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