Vm. Ivanov et Sa. Morozko, TEST METHODS IN ANALYTICAL-CHEMISTRY - DETERMINING THE CAPACITY OF TEST REAGENTS CONTAINING HETEROCYCLIC AZO-COMPOUNDS, Journal of analytical chemistry, 51(10), 1996, pp. 989-992
A procedure has been developed for the photometric determination of he
terocyclic azo compounds 1-(2-pyridylazo)-2-naphthol (PAN), 4-(2-pyrid
ylazo)resorcinol (PAR), 1-(2-thiazolylazo)-2-naphthol (TAN), and 4-(2-
thiazolylazo)resorcinol (TAR) by the reaction of oxidation by cerium(I
V) salts. This procedure is applied to determining 5-100 mu mol/g of h
eterocyclic azo compounds immobilized on S-80 silica gel and employed
in test methods as test reagents.