Registration Dossier

Ecotoxicological information

Ecotoxicological Summary

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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

TPP hydrolyzes rapidly (0.5 -1 hr) half-life and therefore the CSA will evaluate its primary hydrolysis product - phenol.

Phenol PNECs

Upon hydrolysis, one mole of TPP produces three 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)

 

Phosphorous Acid

Phosphorous acid is also a hydrolysis product of TPP; one mole of TPP 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 TPP. As such, the environmental assessment has focused just on phenol.

Conclusion on classification

TPP was classified as R50 -53 in the existing harmonised classifications. However, due to its low water solubility and rapid hydrolysis, it appears that TPP poses no hazard to the environment. The hydrolysis products, phenol and phosphorous acid, are not classified as dangerous to the environment. The registrants intend to seek a review and change to the existing harmonised classifications for TPP for the environment.