SELECTIVE AND SENSITIVE FLUOROMETRIC DETERMINATIONS OF COBALT(II) ANDHYDROGEN-PEROXIDE WITH FLUORESCEIN-HYDRAZIDE

Fluorophotometric determinations of cobalt(II) and hydrogen peroxide w ere investigated by using the fluorescence reaction between fluorescei n-hydrazide (fl-NHNH2), and/or hydrogen peroxide, cobalt(II), respecti vely. The calibration graphs were liner in the range of 0-6.0 ng cobal t(II) and 0-1000 ng hydrogen peroxide per 10 ml at an emission wavelen gth (E-m) of 530 nm with an exicitation wavelength (E-x) of 508 nm, re spectively. These proposed methods were selective and simple, and the effect of foreign ions was negligible in comparison with conventional reported methods such as nitroso R,4-(2-pyridylazo)resorcinol(PAR), al izarin, pyridine-2-aldehyde-2-pyridinehydrazone, stilbazo-cobalt(II), etc. (C) 1998 Elsevier Science B.V. All rights reserved.