Registration Dossier

Diss Factsheets

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no data available: testing technically not feasible

Marine water

Hazard assessment conclusion:
no data available: testing technically not feasible

STP

Hazard assessment conclusion:
no data available: testing technically not feasible

Sediment (freshwater)

Hazard assessment conclusion:
no data available: testing technically not feasible

Sediment (marine water)

Hazard assessment conclusion:
no data available: testing technically not feasible

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no data available: testing technically not feasible

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

DPDP hydrolyzes rapidly (1 -12 hr) half-life and therefore the CSA will evaluate its primary hydrolysis products - phenol and isodecanol.

Phenol PNECs

Upon hydrolysis, one mole of DPDP produces two moles of phenol. As such, it is the primary hydrolysis product for TPP. Phenol is well studied and reviewed.  There are established PNECs in the published risk assessment report (ECB 2006 Phenol Risk Assessment).

PNECaqua= 7.7 μg/l (ECB 2006 Phenol Risk Assessment)

PNECmicroorganism= 2.1 mg/l (ECB 2006 Phenol Risk Assessment)

PNECsoil= 136 μg/kg dry weight (ECB 2006 Phenol Risk Assessment)

PNECsediment =115.6 mg/kg dw (ECB 2006 Phenol Risk Assessment)

 

Isodecanol PNECs

Upon hydrolysis, one mole of DPDP produces one mole of isodecanol. Isodecanol is separately registered under REACH and the details on the PNEC are below:

Substance: 271-234-0 / 68526-85-2 / Isodecanol

REACH registration number for Exxal 10 by ExxonMobil :

01-2119449807-26-0000

 

6 Ecotoxicological Information

Endpoint summary: Ecotoxicological Information/Isodecanol/68526-85-2

 

PNEC aqua (freshwater) in 0.4 mg/L

Assessment factor: 1

Extrapolation method: assessment factor

Simple non-polar narcotic mixture of alcohol isomers. 3 long-term endpoints.

 

PNEC aqua (marine waters) in 0.4 mg/L

Assessmentfactor:1

Extrapolationmethod:assessment factor

Simple non-polar narcotic mixture of alcohol isomers. 3 long-term endpoints.

 

PNEC aqua (intermittent releases) in 2.78 mg/L

Assessment factor - 1

Extrapolation method - assessment factor

Simple non-polar narcotic mixture of alcohol isomers. 3 acute endpoints.

 

PNEC STP in 4.3 mg/L

Assessment factor - 10

Extrapolation method - assessment factor

The PNEC for sewage treatment plant was determined using the NOEC for an STP inoculum from a ready

biodegradation test.

 

PNEC sediment in 117 mg/kg sediment dw

Assessment factor - 1

Extrapolation method - assessment factor

 Experimental sediment toxicity data for isodecanol are not available. PNECs for the sediment compartment were

derived based on the results from three long-term endpoints representing three trophic levels, as well as the

Equilibrium Partitioning Method.

PNEC soil in 95 mg/kg soil dw

Assessment factor - 1

Extrapolation method - assessment factor

Isodecanol is expected to have a low potential to produce toxicity in terrestrial species (earthworm and plants),

based on (Q)SAR predictions and the Equilibrium Partitioning Method.

 

PNEC oral in 22.22 kg/kg food

Assessment factor - 90

Based on a 13 week rat NOAEL of 100 mg/kg/d with iso-undecanol. Conversion factor for rats used was 20 bw/dwi. Assessment factor for 90 day study used (90). Results have been reported in mg/kg food. Secondary poisoning for alcohols, C9 -11 -iso, C10 -richisnot expected based on results from bioconcentration studies asdescribed in Section 4.3.1.2and evidence of biotransformation and metabolism as reported by deWolf and Parkerton (1999). Alcohols, C9 -11 -iso, C10 -richis not classified and labeled for the environment based on available toxicity data

and ready biodegradability.

 

Phosphorous Acid

Phosphorous acid is also a hydrolysis product of DPDP; one mole of DPDP produces one mole of phosphorous acid. Since the element phosphorous is an essential plant nutrient and phosphorous acid and its salts have low relatively low plant, animal and human toxicity, it appears that phosphorous acid will not have a significant impact on the environmental assessment of DPDP. As such, the environmental assessment has focused on phenol and isodeanol.

Conclusion on classification

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