Spectrophotometric determination of silver by new azodyes deriven from 2-thiobarbituric acid Partll : Silver Complexes

الملخص EN

This study describe the use of new azodyes reagents 5-( 2,3- dihydro-1,4-phathalezindion- azo) -2- thiobarbituric acid ( L1 ) and 5-(2-thiobarbituric acid azo )-phenyl-4-acetic acid (L2) as sensitive and selective analytical reagents for the determination of Ag(I) spectrophotometrically.

L1 and L2 react with Ag+ at pH ( 9 and 10 ) respectively to form colored complexes of 1 :2 stoichiometry which show a maximum absorbance of 540 and 425 nm.

of molar ratio absorbitivity 0.59 X104 and 1.63 X104 l.mol-1.cm-1 respectively.

fixed optimum conditions were constructed, precision , accuracy, R.S.D.and correlation factors.

The Beers law was obeyed up to 25 and 7.56 ppm.

respectively.The stability constants of complexes were determined