Simultaneous Spectrophotometric Determination of Vanadium(V) and Iron(III) in Micellar Medium by H-Point Standard Addition Method

H-point standard addition method (hpsam) was applied for the simultaneous determination of v(v) and fe(iii). the method is based on the complex formation of v(v) and fe(iii) with chromazurol s (cas) in acidic media and in the presence of cetyltrimethylammonium bromide (ctab) as a micellizing agent. acidic media and the presence of a micellar system improve selectivity and sensitivity. fe (iii) and v (v) could be determined simultaneously in the range of 0.1-2 and 0.2-2 µg / ml, respectively, and with the ratio 1:20 to 10:1 fe(iii)/v(v) in the mixed samples. the proposed method was successfully applied to the simultaneous determination of fe(iii) and v(v) in tap, river, saliva and plasma samples.