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Item Engineering Chemistry(IK International, New Delhi, 1998) Gadag, R.V.; Shetty, Nityananda A.Item Spectrophotometric determination of palladium(II) using piperonal thiosemicarbazone(2003) Shetty, P.; Nityananda, Shetty, A.; Gadag, R.V.A simple, rapid, selective and sensitive spectrophotometric method for the determination of palladium is proposed using piperonal thiosemicarbazone (PATS) as a reagent. The reagent forms a 1:2 complex (Pd:Reagent) with palladium. The yellow complex is soluble in 32-40% ethanol and has an absorption maximum at 363 nm. Beer's law is obeyed upto 3.85 ppm of palladium and the optimum concentration range is 0.5-2.45 ppm of Pd. The molar absorptivity and Sandell's sensitivity are 3. 80 x 104 dm3 mol-1 cm -1 and 2.8 x 10-3 ?g cm-2, respectively. The experimental conditions for complete colour development and the interference from various ions are investigated. The method is used for the determination of palladium in its complexes and synthetic mixtures.Item Rapid spectrophotometric determination of platinum (IV) using piperonal thiosemicarbazone(2002) Shetty, P.; Shetty, A.N.; Gadag, R.V.A simple, rapid, selective and sensitive spectrophotometric method for the determination of platinum has been proposed based on the colour reaction between platinum(IV) and piperonal thiosemicarbazone (PATS) in 0.008 - 0. 032 M sulphuric acid medium. The greenish yellow complex has an absorption maximum at 360 nm. Beer's law is obeyed upto 6.5 ppm of Pt and the optimum concentration range is 1 - 5.1 ppm of Pt. The molar absorptivity and Sandell's sensitivity are 3. 239 x 104 1 mol-1 cm-1 and 0.006 ?g cm-2, respectively. The optimum conditions for complete colour development have been investigated by studying parameters like effect of medium, acidity, reagent concentration, time period and effect of diverse ions. The method is used for the determination of platinum in hydrogenation catalysts and platinum complexes.Item Indirect complexometric determination of thallium(III) using thioglycolic acid as masking agent(2000) Shetty, P.; Nityananda, Shetty, A.; Gadag, R.V.A simple and selective complexometric method for the determination of thallium(III) is proposed by using thioglycolic acid as a masking agent. In the presence of diverse metal ions thallium(III) is complexed with excess EDTA and the surplus EDTA is back titrated (pH 5 - 6 , hexamine) with standard zinc sulphate solution using xylenol orange indicator. A freshly prepared 1% aqueous solution of thioglycolic acid is then added to displace EDTA from Tl(III)-EDTA complex and the released EDTA is titrated with standard zinc sulphate solution. The results for the determination of 4 - 87 mg of thallium are obtained with a relative error of 0.3% and coefficient of variation 0.46%. The effect of diverse ions are studied. The method is applied to the determination of thallium in its complexes and synthetic mixtures.Item Complexometric determination of palladium(II) using 2-mercapto propionyl glycine as demasking agent(2002) Shetty, P.; Nityananda, Shetty, A.; Gadag, R.V.A simple, rapid and accurate complexometric method for the determination of palladium(II) is proposed, based on the selective demasking property of 2-mercapto propionyl glycine (MPGH2) towards palladium(II). In the presence of diverse metal ions, palladium(II) is complexed with excess of EDTA and the surplus EDTA is back titrated at pH 5-5.5 (acetic acid-acetate buffer) with standard zinc sulphate solution using xylenol orange as indicator. An excess of a 0.2% aqueous solution of MPGH2 is then added to displace EDTA from Pd(II)-EDTA complex. The released EDTA is titrated with the same standard zinc sulphate solution as before. Reproducible and accurate results are obtained in the concentration range 2-22 mg of palladium with relative error of 0.36% and coefficient of variation (n=6) not exceeding 0.31%. The effect of diverse ions are studied. The method is used for the determination of palladium in its complexes, catalysts and synthetic alloy mixtures.Item Complexometric determination of palladium (II) using hydroxylamine hydrochloride as releasing agent(1989) Shetty, A.Nityananda; Gadag, R.V.; Gajendragad, M.R.A method is proposed for selective complexometric determination of Pd(II) using hydroxylamine hydrochloride as a replacing (masking) agent. An excess of EDTA is added to Pd(II) solution containing associated diverse metal ions and the uncomplexed EDTA is titrated at pH 5-6 (acetic acid - acetate buffer) with lead nitrate solution using xylenol orange as indicator. Hydroxylamine hydrochloride is then added to displace EDTA from the Pd-EDTA complex. The released EDTA is titrated with standard lead nitrate solution. Reproducible and accurate results are obtained in the concentration range 0.3-15 mg of Pd with a relative error of 0.4% and coefficient of variation (n=6) not exceeding 0.4%.Item Complexometric titration of thallium(III), by use of 4-amino-5-mercapto-3-propyl-1,2,4-triazole as replacing reagent(1988) Shetty, A, N.; Gadag, R.V.; Gajendragad, M.R.A simple and selective EDTA method using a masking and demasking technique is proposed for the determination of thallium(III). The thallium is complexed with excess of EDTA, the surplus being back-titrated (pH 5-6, hexamine buffer) with zinc sulphate solution (Xylenol Orange as indicator). 4-Amino-5-mercapto-3-propyl-1,2,4-triazole is then added and the mixture heated on a water-bath for 5-10 min to displace EDTA from its thallium complex. The EDTA liberated is titrated with zinc sulphate solution. Reproducible and accurate results are obtained in the range 5-75 mg of thallium with both the relative error and coefficient of variation not exceeding 0.4%. 1987.Item Complexometric determination of mercury(II) by use of 4-amino-5-mercapto-3-propyl-1,2,4-triazole as replacing reagent(1982) Gadiyar, H.R.A.; Gadag, R.V.; Gajendragad, M.R.A simple, rapid, and selective complexometric method is proposed for the determination of mercury(II). Mercury(II) is first complexed with excess of EDTA and the surplus EDTA is back-titrated (pH 5-6) with zinc sulphate solution, with Xylenol Orange as indicator. 4-Amino-5-mercapto-3-propyl-1,2,4-triazole is then added to displace EDTA from the Hg-EDTA complex and the released EDTA is titrated with zinc sulphate solution. Reproducible and accurate results are obtained in the range 1-40 mg of mercury, with a relative error of approximately 0.4%. 1982.Item 4-Amino-3-methyl-5-mercapto-1,2,4-triazole as a gravimetric reagent for determination of silver in silver compounds, alloys and complexes(1978) Gadag, R.V.; Gajendragad, M.R.A simple, convenient and accurate gravimetric method for the determination of silver is presented. 4-Amino-3-methyl-5-mercapto-1,2,4-triazole precipitates silver quantitatively from ammoniacal tartrate medium. The complex is weighed as AgC3H5N4S after drying at 120-30 . Separation of silver from a large number of cations is described. Application of the method for quantitative analysis of alloys and complexes of silver is reported. The average relative error for the range 20-70 mg of silver is 0.25% and the relative standard deviation at the 40-mg level is 0.2%. 1978.