Spectrophotometric study of  Cobalt(II) Using Organic Reagent  2-[(6– Methyl–2- Benzothiazolylazo]-4-Chl Biet tin gi chua, vao day coi di  	http://gaigoibaucat.xlphp.net   phenol .

H. Kadhim, Kassim; A. Nassr, Nassr; M. Jreo, Aqeel; H. Majeed, Ahmed; M. Ali, Ahmed

	Spectrophotometric study of Cobalt(II) Using Organic Reagent 2-[(6– Methyl–2- Benzothiazolylazo]-4-Chl Biet tin gi chua, vao day coi di http://gaigoibaucat.xlphp.net phenol .
Iraqi National Journal Of Chemistry
Article 1, Volume 0, Issue 32, 2014, Pages 709-715
Authors
Kassim H. Kadhim; Nassr A. Nassr; Aqeel M. Jreo; Ahmed H. Majeed; Ahmed M. Ali
Abstract
Abstract 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.

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