Registration Dossier
Registration Dossier
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EC number: 219-660-8 | CAS number: 2492-26-4
pH
Administrative data
- Endpoint:
- pH
- Type of information:
- other: manufacture data
- Adequacy of study:
- weight of evidence
- Reliability:
- 4 (not assignable)
- Rationale for reliability incl. deficiencies:
- other: manufacture data without proof
Data source
Reference
- Reference Type:
- other: company data
- Title:
- Safety Data Sheet
- Author:
- Flexsys
- Year:
- 2 008
Materials and methods
- Principles of method if other than guideline:
- no data
- GLP compliance:
- no
Test material
- Reference substance name:
- Sodium benzothiazol-2-yl sulphide
- EC Number:
- 219-660-8
- EC Name:
- Sodium benzothiazol-2-yl sulphide
- Cas Number:
- 2492-26-4
- Molecular formula:
- C7H4NS2.Na
- IUPAC Name:
- sodium 2-sulfanylidene-2,3-dihydro-1,3-benzothiazol-3-ide
- Reference substance name:
- Sodium-2-mercaptobenzothiazole
- IUPAC Name:
- Sodium-2-mercaptobenzothiazole
- Details on test material:
- 45-50% aqueous solution
Constituent 1
Constituent 2
Results and discussion
pH value
- pH value:
- 10.5 - 11.3
- Temp.:
- 20 °C
- Concentration:
- 45 - 50 other: % w/w
Any other information on results incl. tables
According to the estimation through pH=1/2pKw+1/2pKa+1/2logc, where
pKw: dissociation constant of water 13.92 at 25°C
pKa: the dissociation contant of MBT as weak acid 7.03 at 20°C
c: concentration (mol/l) of the aqueous solution
The aqueous solution (30%-50%) of SMBT should have a pH of 10.5 -11 at ambient temperature. This matchs the reported value from manufacture.
Applicant's summary and conclusion
- Executive summary:
Aqueous solution of SMBT, with a w/w percentage of 30 -50%, should have a pH of 10.5 -11 at ambient temperature as estimated by expert and proved by manufacture data.
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