Study of the Catalytic Activity of Cobalt in Chemiluminescence

摘要

The influence of the sequence of mixing of components on chemiluminescence in the system luminol-cobalt (II, III)-H sub 2 O sub 2 was studied by a photoelectric method based on the maximum intensity and total luminescence. The optimal mixing sequence is as follows: (Co, L, NaOH)+H sub 2 O sub 2 . It is shown that for simple Co (II) salts and complexes of Co (III) of moderate strength the valent state of the cobalt has no significant influence. The transition Co (II) implies Co (III) occurs slowly in the presence of luminol and EDTA at pH 12 due to the oxygen in the air. The maximum glow intensity was used to study the influence of a number of complex formers on the catalytic effect of cobalt. It was found that extinction of the glow results from bonding of the cobalt into a complex and the impossibility of formation of a complex of a cobalt with luninol active in terms of chemiluminescence. (ERA citation 07:004870)