Grases, F. published the artcileDetermination of cobalt(II) by use of a very simple monitored thermometric technique based on the action of this cation on the aerial oxidation of 2,2′-dipyridyl ketone hydrazone, Quality Control of 2215-33-0, the publication is Journal of Thermal Analysis (1984), 29(6), 1397-402, database is CAplus.
Co(II) 0.1-0.9 ppm was determined by catalysis of autoxidation of 1.0mM di(2-pyridyl) ketone hydrazone at pH 12 (Clark-Lubs buffer), monitored by thermometry. The relative standard deviation was 2.1%. The selectivity was good.
Journal of Thermal Analysis published new progress about 2215-33-0. 2215-33-0 belongs to pyridine-derivatives, auxiliary class Pyridine,Amine, name is 2-((2-(Pyridin-2-yl)hydrazono)methyl)pyridine, and the molecular formula is C11H10N4, Quality Control of 2215-33-0.
Referemce:
https://en.wikipedia.org/wiki/Pyridine,
Pyridine | C5H5N – PubChem