Registration Dossier
Registration Dossier
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EC number: 407-950-9 | CAS number: 895-85-2 INTEROX-PMBP-70W; INTEROX-PMPB-70W
Endpoint summary
Administrative data
Description of key information
In a stability test in water and test medium under test conditions (pH 8, 20 °C) the substance turned out to be hydrolytically instable with a half-life of 2.3h. Therefore a full hydrolysis study was performed with identification of the hydrolysis product. In this study the following half-lives were determined:
25°C, pH 4: DT50 = 18 h
25°C, pH 7: DT50 = 9 h
25°C, pH 9: DT50 = 23 min
The hydrolysis product is p-toluic acid which was identified after 1 and 2 weeks in high quantities.
In a STP pH is around 7 and the environmentally relevant temperature is 12 °C. Temperature in a STP is usually higher than the environment, between 12 and 20 °C approx., therefore 12 °C is taken as a worst case for the speed of hydrolysis. At pH 7, 12 °C the half-life of bis(4-methylbenzoyl)peroxide is 22.8h which is less than 1 day. Therefore, microorganisms may be exposed to bis(4 -methylbenzoyl)peroxide, but for exposure of surface water the hydrolysis product p-toluic acid is more relevant and should be considered. In the exposure assessment, p-toluic acid is therefore taken into consideration.
In a ready biodegradability study performed under GLP, according to OECD 301D, it was shown that the test substance is readily biodegradable with 88% biodegradation over 28 days.
The hydrolysis product p-toluic acid is also readily biodegradable and is hydrolytically stable (OECD SIDS, 2008).
Additional information
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