Spectrophotometric study of cobalt (ii)‎ using organic reagent 2-[(6– methyl–2- benzothiazolylazo]-4-chl biet tin gi chua, vao day coi di

الملخص EN

A sensitive and selective spectrophotometric method was proposed for studying of Co(II) using 2-[(6-Methyl-2-Benzothiazolyl) azo]-4-Chloro Phenol (6 MeBTAClP).

The reaction between Co(II) and(6-MeBTAClP) reagent is instantaneous at pH=6.1, and the absorbance remains stable for over 24 h.

The method allows for the determination of Co(II) over the range (0.3 - 10.0)μg.ml-1,with molar absorptivity of( 1884.8)l.mol-1.cm-1 and a detection limit of 0.27 μg.ml-1 at 600 nm .Recovery and relative error values of precision and accuracy of method were found to be R.S.D%=1.22%, Re%=96.68%, and Erel=3.32% .Study of complex nature shows that (M: L) ratio was 1:2 at pH=6.1, and the stability constant of (8.33 x 107) l2.

mol-2 .The interferences of ions (NH4+,I- ,Hg2+ ,Al3+,Cu2+, Ni2+, F-,S2O32-) on absorbance were studied.

A suitable masking agents were used for eliminating of seriously interfering ions