Registration Dossier
Registration Dossier
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EC number: 219-660-8 | CAS number: 2492-26-4
Dissociation constant
Administrative data
Link to relevant study record(s)
Description of key information
SMBT is an organic salt of strong base NaOH and weak acid of MBT; and hence its aqueous solution has a basic character. The marketed aqueous solutions of SMBT have normally a w/w concentration of 30% to 50% with a pH of ca. 10. The ionisation state depends upon pH and the pKa of the weak acid MBT, which has been experimentally determined to be 7.03 at 20 +/-1°C (CMA, 1989). Under environmentally relevant pHs (4 -9), the higher is the pH and the higher is the percentage of undissociated MBT.
Key value for chemical safety assessment
Additional information
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