The Spectrophotometric Determination of Samarium (III) With (l-2(2-Benzoinidazoly-AZO)-2-Hydroxy-3- Naphthoic Acid

Samarium(III) ions react with (l-2(2-benzoinidazolyl-azo)-2-hydroxy-3-naphthoic acidin basic medium (pH = 8.0) forms a red-orange complex at A.max (550nm). The complex wasfound to be stable for at least 48 hrs. at the given pH. The apparent molar absorptivity is7776.77 L.mol^-1.Cm^-1 and a linear calibration curve is obtained in the range (0.639x 10^-5M -6.350x 10^ -5M).The stoichiometry of complex was confirmed by using mole ratio method whichindicated that ratio of reagent to metal is 3:1.The effects of the presence of different cations and anions as interferences in thedetermination of samarium(III) under the given conditions were investigated.