Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Transport between Environmental Compartments

The potential distribution of TGBE (Triethylene glycol monobutyl ether's or (2-(2-(2-butoxyethoxy)ethoxy)ethanol))  has been estimated using the Mackay Level III fugacity modeling approach (EPIWIN). Such modeling estimates relative distribution within different environmental compartments, based on key physical property parameters.

The Level III estimated mass balances for category members, shown in Table 1, lend further weight to limited volatilization and a preference for partitioning to water and soil.

The ethers in this category possess physical properties that suggest that once they enter the aqueous compartment, they tend to remain dissolved in water. Soil/sediment partition coefficients (Koc) of 10 have been estimated for TGBE, TetraME and TetraBE using the EPIWIN/PCKOCWIN (Table 1).

These results suggest that the category members have uniformly high soil mobility. Thus, these products can leach from soil deposits to groundwater, but can also be transported to environments where aerobic biodegradation can take place.

(Table 1).Comparison of Environmental Fate Parameters for Category Members and

Surrogates

Chemical

Henry’s Law Constantb (atm-m3/mole)

Photodegradation OH radical rate constantb (cm3/molecule-sec)

Koc

Predicted Environmental Distribution (Mackay III fugacity model)

Air (%)

Water (%)

Soil (%)

Sed. (%)

TGBE

143-22-6

9.52 E-14

51.5 E-12

 24 d

 0.0608

44.7

55.1

0.0766

TetraME

23783-42-8

1.57 E-13

54.0 E-12

10 b

2.45 E-9

45.3

54.6

0.0755

TetraBE

1559-34-8

3.67 E-13

63.0 E-12

10 b

6.59 E-9

45.1

54.8

0.0755

TGME

112-35-6

3.54 E-14

40.0 E-12

4 d

 0.0657

45.9

53.9

0.0765

TGEE 112-50-5

4.77 E-14

45.4 E-12

7 d

 0.0538 x 10-6

45.3

54.6

0.0755

MPEG350 9004-74-4

No data

No data

No data

No data

No data

No data

No data

DOT4 Brake

Fluid

No data

No data

No

data

No data

No data

No data

No data

Polyethylene

glycol

monobutyl

ether

No data

No data

No

data

No data

No data

No data

No data