Faculty Publications
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Item A complexometric method for the determination of mercury(II) in presence of other metal ions is described based on the selective masking action of 1-propane thiol towards mercury(II). Mercury(II) present in a given sample solution is first complexed with an excess of EDTA and the unreacted EDTA is titrated against lead nitrate solution at pH 5-6 (hexamine buffer) using xylenol orange as the indicator. A 0.8% aqueous solution of 1-propane thiol is then added to displace EDTA from the Hg(II)-EDTA complex. The released EDTA is titrated with standard lead nitrate solution as before. Reproducible and accurate results are obtained for 4-85 mg of mercury(II), with relative error less than ±0.23% and coefficient of variation not more than ±0.41%. The effects of various ions were studied. The method is used for the analysis of mercury(II) in its synthetic alloy mixtures and also in complexes.(Indirect complexometric determination of mercury(II) using 1-propane thiol (PT) as a selective masking agent) Parameshwara, P.; Karthikeyan, J.; Nityananda Shetty, A.N.; Shetty, P.2005Item A simple and selective complexometric method for the determination of thallium in presence of other metal ions is proposed based on the selective masking ability of ethanethiol towards thallium(III). Thallium present in a given sample solution is first complexed with a known excess of EDTA and the surplus EDTA is titrated with standard zinc sulphate solution at pH 5-6(hexamine) using xylenol orange as the indicator. A 0.3% aqueous solution of ethanethiol is then added to displace EDTA from the Tl(III)-EDTA complex. The released EDTA is titrated with standard zinc sulphate solution as before. Reproducible and accurate results are obtained for 3.70 mg to 74.07 mg of Tl (III) with relative error less than ±0.44% and coefficient of variation not more than 0.27%. The interference of various ions was studied and the method was used for the analysis of thallium in its synthetic alloy mixtures and also in complexes. ©2006 Sociedade Brasileira de Química.(Sociedade Brasileira de Quimica, Complexometric determination of thallium(III) using ethanethiol as a selective masking agent) Karthikeyan, J.; Parameshwara, P.; Nityananda Shetty, A.N.; Shetty, P.2006Item Quantitative complexometric determination of palladium(II) in its synthetic alloys, complexes and catalysts using 2-mercaptopropionic acid as a selective masking agent(2007) Karthikeyan, J.; Parameshwara, P.; Nityananda Shetty, A.N.; Shetty, P.A simple, rapid and accurate complexometric method for the determination of palladium(II) is proposed, based on the selective masking property of 2-mercaptopropionic acid towards palladium(II). In the presence of diverse metal ions, palladium(II) is complexed with excess of EDTA and the surplus EDTA is backtitrated with standard zinc sulphate solution at pH 5-5.5 (acetic acid-sodium acetate buffer) using xylenol orange as indicator. An excess of a 0.5% aqueous solution of 2-MPA 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 0.5-17.80 mg of palladium with relative error of ± 0.50% and coefficient of variation not exceeding ± 0.33%. The effects of diverse ions are studied. The method is used for the determination of palladium in its complexes, catalysts and synthetic alloy mixtures.Item Indirect complexometric determination of thallium(III) in its alloys and complexes using thiomalic acid as a selective releasing agent(2007) Parameshwara, P.; Karthikeyan, J.; Nityananda Shetty, A.N.; Shetty, P.A simple and selective complexometric method for the determination of thallium in presence of other metal ions is proposed on the basis of selective masking ability of thiomalic acid towards thallium(III). Thallium present in a given sample solution is first complexed with a known excess of EDTA and the surplus EDTA is titrated with standard lead nitrate solution at pH 5-6, using xylenol orange as the indicator. A 0.6% aqueous solution of thiomalic acid is then added to displace EDTA from the Tl(III)-EDTA complex. The released EDTA is titrated with standard lead nitrate solution. Reproducible and accurate results are obtained for 3-92 mg of Tl(III) with relative error less than ±0.17% and coefficient of variation not more than 0.36%. The interference of various ions is studied. This method is used for the analysis of thallium in its synthetic alloy mixtures and also in complexes.Item One-step simple method for the determination of palladium using 3-acetyl2-thiohydantoin as a releasing agent(2009) Karthikeyan, J.; Naik, P.; Nityananda Shetty, A.N.A simple, rapid and accurate complexometric method for the determination of palladium(II) is proposed, based on the selective masking property of 3-acetyl-2-thiohydantoin (ATH) 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 with standard lead nitrate solution at pH 5-6 (acetic acid - sodium acetate buffer) using xylenol orange as indicator. An excess of a 0.5% solution of ATH is then added to displace EDTA from Pd(II) - EDTA complex. The released EDTA is titrated with the same standard lead nitrate solution as before. Reproducible and accurate results are obtained in the concentration range 0.35-11.00 mg of palladium with relative error of ±0.46% and coefficient of variation not exceeding 0.36%. The effects of diverse ions are studied. The method is used for the determination of palladium in alloys, hydrogenation catalyst and complexes with a fair degree of accuracy.