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EC number: 473-820-3
CAS number: -
Under the conditions of this study the pKa values were determined to be 4.03 and 6.69 at 20 °C.
The dissociation constant of the test material was evaluated in a study
conducted in accordance with the standardised guideline OECD 112 under
GLP conditions. The study was awarded a reliability score of 1 in
accordance with the criteria for assessing data quality set forth by
Klimisch et al. (1997).
The test method used was the titration method. As a 0.01 M solution of
the test material is 2.108 g/L, which is above the stated solubility
value of 0.3 g/L, a concentration of nominally 0.15 g/L (half the stated
water solubility) was used.
The pH of the test solution in double distilled water was about 8. On
this basis, two preliminary titrations were performed, one with 0.01 M
HCl and the other with 0.01M NaOH. The double distilled water was
considered to be free of dissolved carbon dioxide.
A graph to cover both titrations was constructed. The end point of the
acid titration was taken to be the starting point. The descending
volumes of acid from the end point were subtracted from the end point
volume and the end point volume of acid was added to the alkali volumes.
Two inflections were revealed, indicative of two pKa values.
Two definitive tests were performed in like manner.
Under the conditions of this study the pKa values were determined to be
4.03 and 6.69 at 20 °C.
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