Synthesis of the new 2-[(6– Methyl–2- Benzothiazolylazo]-4-Chloro phenol Organic reagent for Spectrophotometric determination of Copper(II).

Abstract

Anew 2-[(6-Methyl-2-Benzothiazolyl)azo]-4-Chloro Phenol (6-
MeBTAClP)Organic reagent was synthesized . A sensitive and selective
spectrophotometric method was proposed for the rapid determination of Cu(II) by
using (6-MeBTAClP) reagent.The reaction between Cu(II) and (6-MeBTAClP)
reagent is instantaneous at pH=4.0, and the absorbance remains stable for over 24 h.
The method allows for the determination of Cu(II) over the range (0.05 -4.0)μg.ml-
1,with molar absorptivity of( 1.271x104 )l.mol-1.cm-1 and a detection limit of 0.12
μg.ml-1 .Recovery and relative error values of precision and accuracy of method were
found to be R.S.D%=0.421,Re%=98.67% ,and Erel=1.33% .Study of complex nature
shows that ; (m: r) ratio was 1:2 at pH=4.0 ,and the stability constant of (1.256 x
1010) l2. mol-2 . The interferences of ions (CrO4
-2,Pb+2 ,Hg+2 ,Zn+2,Cd+2, Ni+2, MoO4-
2,WO4 -2) and masking agents effect on absorbance were studied.