DF2000 PEP

SUMMARY

· Physical Degradation (Atmospheric): Rapid Rate
· Biodegradation: Moderate Rate
· Acute Toxicity to Aquatic Organisms: Not Expected
· Chronic Toxicity to Aquatic Organisms: Not Expected

ExxonMobil Chemical Drycleaning Fluid 2000 (DF-2000TM Fluid) released to water and soil environments is calculated to partition largely to the air with the remaining residues expected to partition predominantly between soil and sediment. Volatilization of DF-2000 Fluid to the air should occur at a relatively rapid rate. In the air, it will degrade through reaction with hydroxyl radicals and is calculated to have an estimated half-life of less than one day. Results of stringent biodegradation testing indicate that DF-2000 Fluid will biodegrade at a moderate rate. However, over extended periods of time in natural environments, nonvolatilized DF-2000 Fluid residues remaining in soil and sediment should be largely biodegraded.

Because DF-2000 Fluid is relatively volatile, it will be largely lost from open aquatic and terrestrial habitats over the course of a few days or less. Because of the low water solubility and volatile loss of this product from aquatic ecosystems, chronic exposures would not be expected unless a continuous long-term release was to occur. Exposure of aquatic organisms to DF-2000 Fluid is not expected to cause acute toxicity, based on studies which demonstrated that media saturated with this product did not produce mortality to the various organisms tested.

ENVIRONMENTAL FATE SUMMARY
PARAMETER	VALUE		COMMENTS
ENVIRONMENTAL PARTITIONING
Fugacity Model - Mackay Level I:	96.0%	Air	Product will partition largely to air with small amounts to soil and sediment (based on an average of values determined for selected chemical components)
	3.9%	Soil
	0.1%	Sediment
Water Solubility:	<1	mg/L	Low
Henry's Law Constant:	>1	Atm·m³/mole	Suggests that volatilization from water will occur at a rapid rate
Henry's Law Constant:	>100	Pa·m³/mole
Volatilization From Water: Half-life (river): Half-life (lake):			Rapid rate
	<5	hours
	<6	days
Octanol/Water PartitionCoefficient (Log Kow)	6.6 - >7.0	-	Based on values determined for selected chemical components
Soil Adsorption Coefficient (Log Koc)	3.5 - 4.1	-	Moderate to high (based on values determined for selected chemical components)
DEGRADATION PROCESSES
Atmospheric: Half-life	<2	days	Rapid rate based upon hydroxyl radical attack (OH- concentration of 1.56E6 molec/cm3)
Biological:	45%	60 days	Moderate rate (results are for a similar product)

CLASS: COMMON NAME	SCIENTIFIC NAME	END POINT (1) (mg/L)	DURATION (hours)	EXPOSURE TYPE (2)	COMMENTS
FRESHWATER FISH:
Fathead minnow	Pimephales promelas	LL0 = 100	96	STATIC	No mortality occurred in a test system that continually maintained the product dispersed throughout the water column.
Fathead minnow	Pimephales promelas	LL0 = 1,000	96	STATIC	No mortality occurred in a test system that continually maintained the product dispersed throughout the water column. Results are for a similar product.
MARINE INVERTEBRATE:
Crustacean	Chaetogammarus marinus	EL0 = 1,000	96	RENEWAL	No mortality at the highest loading tested. Results are for a similar product.
Crustacean	Chaetogammarus marinus	EL0 = 10,000	96	RENEWAL	No morality at the highest loading tested. Results are for a similar product.

NOTES:

(1) See Appendix 1.A for definitions.
(2) See Appendix 1.B for definitions.
(3) Read across from similar product.

APPENDIX I

1.A - ENVIRONMENTAL TOXICITY: EFFECT ENDPOINT ABBREVIATIONS

LC* - Lethal concentration
LD* - Lethal concentration when exposed through injection or diet
LL* - Lethal loading
EC* - Effective concentration

*The number following these abbreviations signifies the percentage of mortality or effected organisms.
For example:

LC O - No mortality concentration
LLO - No mortality loading
ELO - No effect loading
ECO - No effect concentration
LC 25 - Lethal concentration to 25% of tested organisms
LL 50 - Median lethal loading
EC 100 - Effective concentration to 100% of tested organisms
LT 50 - Lethal threshold concentration to 50% of tested organisms
ET50 - Median estimated survival time

NOEC - No Observable Effect Concentration (Chronic tests)
LOEC - Lowest Observable Effect Concentration (Chronic tests)
MATC - Maximum Allowable Toxicant Concentration (Chronic tests)

The following abbreviations specify the effect measured for EC or NOEC endpoints:

AB - Abnormalities
AC - AChE activity
AV - Avoidance
BA - Byssal attachment
BH - Behavior
BM - Biomass
CC - Color change
CD - Cell division
CF - Cough frequency
CH - Chlorophyll
CL - Case leaving
DE - Detection of Toxicant
DT - Detachment
DV - Development
EM - Emergence

EP - Egg production
EQ - Loss of equilibrium
EZ - Enzyme activity
FC - Food consumption
FC - Reduced first feeding incidence
FF - Critical flicker rate
FL - Fluorescence
FP - Fecal pellets
FR - Filtration rate
GR - Growth
HA - Hatchability
HM - Hemorrhage
IM - Immobilization
IN - Inhibition
IR - Irritation

MI - Migration suppression
OX - Oxygen production
PC - Population carrying Capacity
PH - Physiological effect
PP - Population size reduction
PS - Photosynthesis effect
PU - Pupation
RE - Reproduction
RG - Regeneration
RR - Respiratory rate
SC - Shell valve closure
SW - Swimming
TE - Teratogenesis
UP - Uptake
VD - Vertebral damage

1.B - ENVIRONMENTAL TOXICITY: EXPOSURE TYPE ABBREVIATIONS

CMIT - Cell multiplication inhibition test.
DIET - Chemical is mixed with food and delivered during feeding.
FLOW-THR - Chemical is mixed with water and delivered continuously to test system via flow-through apparatus (e.g., diluter).
INJECTION - Chemical is delivered directly to specific tissue of organism (e.g. intramuscular via syringe.
IN SITU - Organisms were exposed in their native habitat.
IN VITRO - Chemical exposures were performed on extracts or components from organisms (e.g., enzymes) and not intact organisms.
P - Calculated using a QSAR (Quantitative Structure-Activity Relationship) computer program.
RENEWAL - Exposure media is changed at defined periods (e.g., daily) during the course of the test.
STATIC - Chemical is mixed with exposure media at the start of the test, and media is not changed during the course of the test.

1.C - ENVIRONMENTAL FATE: ABBREVIATIONS

BIODEG - Biodegradation
BIOX - Biological activation
BODX - Biochemical oxygen demand measure after x days
COD - Chemical oxygen demand
SCAS - Semi-continuous activated sludge
TCO2 - Theoretical CO2
ThOD - Theoretical oxygen demand

(The information relates only to the specific material designated and may not be valid for such material used in combination with any other materials or in any process. Such information is, to the best of our knowledge and belief, accurate as of the date compiled. However, no representation, warranty or guarantee is made as to its accuracy, reliability or completeness. It is the user's responsibility to satisfy himself as to the suitability and completeness of such information for his own particular use. We do not accept liability of any loss or damage that may occur from the use of this information, nor do we offer any warranty against patent infringement. Issue Date: 20 Oct 00 / Revision Number: 0)

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