TABLE 7.1
Mobility Factors of TRI Chemicals
92
Toxic Chemicals
a weighting factor for this parameter. By taking the square root of the VPs, MFs
ranged over approximately 1,000 to 1 across TRI chemicals, as shown in Table 7.1.
WATER MOBILITY FACTOR
The solubility (in milligrams per liter) of the TRI chemicals was obtained from the
Risk-Screening Environmental Indicators (RSEI) Database of the U.S. Environmental Protection Agency (USEPA). For the purposes of this analysis, the solubilities
were set such that the maximum was set at 100 percent. Anything greater than this
value does not have an additional impact with respect to release in water. The minimum was set at 1 part per billion, such that some dissolution effect is always taken
into account. Subsequently, chemical-specific water MFs, or the tendency for the
chemical to dissolve and enter the water we drink, were derived by taking the square
root of each chemical-specific water solubility (after converting the water solubility
to kilograms per liter using a standard unit conversion factor) to narrow the range of
the values (just as with the VP values), as shown in Table 7.1.
COMBINED MOBILITY FACTOR
The chemical-specific combined MF was derived by averaging the respective
chemical-specific air and water MFs. This resulted in combined MFs spanning about
five orders of magnitude across TRI chemicals, as shown in Table 7.1. TRI chemicals
for which data were not available are not included in this table.
Air
Water
Combined
Mobility
Solubility
Mobility
Mobility
Chemical Name
VP (atm)
Factor
(mg/L)
Factor
Factor
(1,1′-Biphenyl)-4,4′-diamine,
1.00E–09
3.16E–05
1.30E+03
3.61E–02
1.80E–02
3,3′-dimethyl
1-(3-Chloroallyl)-3,5,7-triaza-11.00E–09
3.16E–05
1.00E+06
1.00E+00
5.00E–01
azoniaadamantane chloride
1,1,1,2-Tetrachloro-2-fluoroethane 1.00E–09
3.16E–05
2.09E+02
1.45E–02
7.24E–03
(Hcfc-121a)
1,1,1,2-Tetrachloroethane
1.58E–02
1.26E–01
1.10E+03
3.32E–02
7.94E–02
1,1,1-Trichloroethane
1.32E–01
3.63E–01
1.49E+03
3.86E–02
2.01E–01
1,1,1-Trifluoro-2,2-dichloroethane 9.29E–01
9.64E–01
1.49E+03
3.86E–02
5.01E–01
1,1,2,2-Tetrachloro-1-fluoroethane 1.00E–09
3.16E–05
2.09E+02
1.45E–02
7.24E–03
1,1,2,2-Tetrachloroethane
6.58E–03
8.11E–02
2.96E+03
5.44E–02
6.78E–02
1,1,2-Trichloroethane
2.50E–02
1.58E–01
4.42E+03
6.65E–02
1.12E–01
1,1-Dichloro-1-fluoroethane
5.42E–01
7.36E–01
2.63E+03
5.13E–02
3.94E–01
1,1-Dichloroethane
3.01E–01
5.49E–01
5.06E+03
7.11E–02
3.10E–01
1,1-Dichloroethylene
7.78E–01
8.82E–01
2.25E+03
4.74E–02
4.65E–01
1,1-Dimethyl hydrazine
2.07E–01
4.55E–01
1.00E+06
1.00E+00
7.27E–01
Mobility Factors of TRI Chemicals
92
Toxic Chemicals
a weighting factor for this parameter. By taking the square root of the VPs, MFs
ranged over approximately 1,000 to 1 across TRI chemicals, as shown in Table 7.1.
WATER MOBILITY FACTOR
The solubility (in milligrams per liter) of the TRI chemicals was obtained from the
Risk-Screening Environmental Indicators (RSEI) Database of the U.S. Environmental Protection Agency (USEPA). For the purposes of this analysis, the solubilities
were set such that the maximum was set at 100 percent. Anything greater than this
value does not have an additional impact with respect to release in water. The minimum was set at 1 part per billion, such that some dissolution effect is always taken
into account. Subsequently, chemical-specific water MFs, or the tendency for the
chemical to dissolve and enter the water we drink, were derived by taking the square
root of each chemical-specific water solubility (after converting the water solubility
to kilograms per liter using a standard unit conversion factor) to narrow the range of
the values (just as with the VP values), as shown in Table 7.1.
COMBINED MOBILITY FACTOR
The chemical-specific combined MF was derived by averaging the respective
chemical-specific air and water MFs. This resulted in combined MFs spanning about
five orders of magnitude across TRI chemicals, as shown in Table 7.1. TRI chemicals
for which data were not available are not included in this table.
Air
Water
Combined
Mobility
Solubility
Mobility
Mobility
Chemical Name
VP (atm)
Factor
(mg/L)
Factor
Factor
(1,1′-Biphenyl)-4,4′-diamine,
1.00E–09
3.16E–05
1.30E+03
3.61E–02
1.80E–02
3,3′-dimethyl
1-(3-Chloroallyl)-3,5,7-triaza-11.00E–09
3.16E–05
1.00E+06
1.00E+00
5.00E–01
azoniaadamantane chloride
1,1,1,2-Tetrachloro-2-fluoroethane 1.00E–09
3.16E–05
2.09E+02
1.45E–02
7.24E–03
(Hcfc-121a)
1,1,1,2-Tetrachloroethane
1.58E–02
1.26E–01
1.10E+03
3.32E–02
7.94E–02
1,1,1-Trichloroethane
1.32E–01
3.63E–01
1.49E+03
3.86E–02
2.01E–01
1,1,1-Trifluoro-2,2-dichloroethane 9.29E–01
9.64E–01
1.49E+03
3.86E–02
5.01E–01
1,1,2,2-Tetrachloro-1-fluoroethane 1.00E–09
3.16E–05
2.09E+02
1.45E–02
7.24E–03
1,1,2,2-Tetrachloroethane
6.58E–03
8.11E–02
2.96E+03
5.44E–02
6.78E–02
1,1,2-Trichloroethane
2.50E–02
1.58E–01
4.42E+03
6.65E–02
1.12E–01
1,1-Dichloro-1-fluoroethane
5.42E–01
7.36E–01
2.63E+03
5.13E–02
3.94E–01
1,1-Dichloroethane
3.01E–01
5.49E–01
5.06E+03
7.11E–02
3.10E–01
1,1-Dichloroethylene
7.78E–01
8.82E–01
2.25E+03
4.74E–02
4.65E–01
1,1-Dimethyl hydrazine
2.07E–01
4.55E–01
1.00E+06
1.00E+00
7.27E–01