Microdetermination of silver(I) and iodide ions with a pyridinol azo dye: A spectrophotometric method |
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Authors: | Y. S. Varma Ishwar Singh B. S. Garg R. P. Singh |
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Affiliation: | Department of Chemistry, University of Delhi, Delhi-110007, India |
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Abstract: | A simple, rapid, sensitive, and selective method for the spectrophotometric microdetermination of silver(I) using ammonium(2′,3′-dihydroxy pyridyl-4′-azo)benzene-4-arsonate (DHP-4A), a water soluble pyridinol azo dye is proposed. The red colored 1:1 (metal to ligand) complex formed has molar extinction coefficient (ε) 2.95 × 104 1 mol−1 cm−1 and absorbs maximum at 535 nm, in highly alkaline medium. Beer's law is obeyed up to 3.36 ppm and Sandell's sensitivity (for an absorbance 0.001) is 0.0037 μg of Ag(I)/cm2. The silver(I)-(DHP-4A) complex has also been used in the microdetermination of iodide ions using ligand exchange reaction. The optimum concentration range of iodide ions which can reproducibly be determined is 1.27–37.9 μg/10 ml. |
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