%0 Journal Article
%T Simultaneous Spectrophotometric Determination of o-Aminophenol and p-Aminophenol Using H-Point Standard Addition Method -Application to Real Waters
%A Theia'a N. Al-Sabha
%A Nagham N. Habeb
%J Pakistan Journal of Analytical and Environmental Chemistry
%D 2012
%I University of Sindh
%X H-point standard addition method (HPSAM) has been applied to the simultaneous determination of o-aminophenol (oA) and p-aminophenol (pA) isomers in binary mixtures. The method is based on the Schiff's base formation of aminophenols with 1,2-naphoquinone sulphonate (NQS) as a chromogenic reagent in the presence of micellar cityltrimethyl ammonium bromide (CTAB) and sodium carbonate. The results showed that simultane ous determinations could be performed with the ratios 0.4 : 2.0 and 4.0 : 2.0 measured at pair of wavelengths (480 and 610) nm with recovery % range 94.75-104.37 % and precision better than 4.0 % when oA considered as analyte and pA as interferent, and a ratio 0.4 : 0.2 and 4.0 : 2.0 measured at 455 and 540 nm with recovery % range 95.37-105.0 % and precision better than 4.0 % when pA considered as analyte and oA as interferent.
%K HPSAM
%K Aminophenol isomers
%K NQS
%K Aqueous solution
%U http://www.ceacsu.edu.pk/PDF%20file/Volume%2013%20No%2001/53-62-PJAEC-12122011-04.pdf