A highly rapid, sensitive and selective, spectrophotometric determination of Molybdenum (VI) with 5-chloro-8-hydroxy-7-iodoquinoline by extraction into chloroform

A simple rapid, extractive spectrophotometric method for micro determination of molybdenum using 5-chloro- 8-hydroxy-7-idoquinolene as a complexing agent has been worked out for various industrially important steel samples as well as for environmental samples. The Mo (VI) 5-Chloro-8-hydroxy-7-idoquinolene (CHIQ) complex is extracted into chloroform. The yellow colour of the complex is measured at λmax 390 nm against a similarly prepared reagent blank. The 1:2 (Mo : CHIQ) complex is found to be stable for more than one hour in the extract and obeys Beer's law over the concentration range of 0-12 μg Mo ml-1. The molar absorptivity and Sandell's sensitivity of the proposed method are found to be 0.7867 × 104 l mol-1 cm-1 and 0.002439 μg Mo cm-2 respectively. A large no. of cations, anions and complexing agents of major analytical importance such as Co (II), Pb (II), Ag (I), As (V), Bi (III), Ni (II), Zn (II), Ti (IV), Sc (IV), Cr (III), Ru (III), Ce (IV), Re (VII), Ir (III), Au (III), Pd (II) and platinum metals and chloride, bromide, sulphate, acetate, phosphate, thiourea, EDTA, iodide, citrate, nitrate, tartarate, sulphosalicylic acid, sodium dithionite, oxalate, flouride do not interfare. Only Iron, Hafnium and niobium and nitrites interfered in the procedure. The method has been satisfactorily applied for the determination of molybdenum in varieties of samples

Author(s): Sonia Bhardwaj and L. R. Kakkar

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