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EC number: 202-908-4
CAS number: 101-02-0
TPP hydrolyzes rapidly (0.5 -1 hr) half-life
and therefore the CSA will evaluate its primary hydrolysis product -
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
PNECmicroorganism= 2.1 mg/l (ECB 2006 Phenol
PNECsoil= 136 μg/kg dry weight (ECB 2006
Phenol Risk Assessment)
PNECsediment =115.6 mg/kg dw (ECB
2006 Phenol Risk Assessment)
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.
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
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