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EC number: 253-057-0
CAS number: 36483-57-5
Hydrolysisas a Function of pH
FR-513 was determined to be hydrolytically stable across the range of
environmentally relevant pH at 25°C. The half-life of FR-513 at pH 4 and
7 was estimated to be greater than 1 year as determined by 5-day
incubations at 50 °C. FR-513 was found to be hydrolytically active only
in pH 9 aqueous buffer at elevated temperatures. Definitive testing at
three elevated temperatures (40, 50 and 60 °C) showed a very strong
temperature dependence of FR-513 hydrolysis at pH 9. Two
hydrolytic degradants - DBMO and bromide - were detected and measured. Using
the Arrhenius equation and the results from these elevated temperatures,
the calculated hydrolysis rate constant for FR-513 at pH 9 and 25°C was
extrapolated as 2.55 x 10-4 day-1, corresponding
to a half-life of 2.72 x 103 days (approximately 7.5 years).
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