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EC number: 204-424-9
CAS number: 120-78-5
The water solubility of Rubator MBTS in demineralized water was
investigated by the flask method according to guideline OECD 105. A
value of the water solubility was determined via HPLC to be <0.05 mg/L
at 20°C at a pH = 5 (Currenta 2015).
MBTS is expected to be insoluble in water at pH 7 due to big molecule and
negligible dissociation constant. Indeed, an experimental study
performing the flask method in combination with HPLC analytics according
to OECD guideline 105 showed a poor water solubility of <0.05 mg/L at 20
°C and a pH = 5 (Currenta, 2015). The manufacture information from Bayer
(1993) , Lanxess (2007) and General Quimica (2007) further support this
very low value with a water solubility of MBTS smaller than 0.2 mg/l at
The experimentally confirmed poor water solubility of MBTS of <0.05 mg/L
at 20 °C (Currenta 2015) is further supported by the information from
other resources, such as:
- estimated value of 0.27- 0.37 mg/L at 25°C and pH = 7 using WSKOW, v.
1.41 (Currenta, 2010)
- expert judgment according to rather big molecule and negligible
dissociation constant at environmentally relevant pH (i.e. pH of 5-9):
insoluble at pH 7 and room temperature
- peer-reviewed literatures: Merck Index (2009) and NIOSH (1997)
reported MBTS as insoluble
- observations from ecotoxicity studies: precipitation and cloudiness in
test solutions of MBTS in water and actual concentrations below
detection limit (<0.3 mg/L).
In contrast, Monsanto (1980) using column elution method reported a
water solubility of MBTS in the range of 49-88 mg/L at 22°C. This result
does not match with information from any other resources and considered
as doubtful according to expert judgment; and hence will not be taken
into account for further assessment.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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