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Veeranna, V.
- Simultaneous Second Order Derivative Spectrophotometric Determination of Mercury and Cobalt Using Furfuraldehyde Thiosemicarbazone (FFTSC)
Authors
1 Department of Chemistry, Sri Krishnadevaraya University, Anantapur -515003, AP., IN
Source
Asian Journal of Research in Chemistry, Vol 4, No 9 (2011), Pagination: 1398-1403Abstract
A simple, selective and sensitive second order derivative spectrophotometric method is developed using FFTSC (furfuraldehyde thiosemicarbazone) for the simultaneous determination of Hg(II) and Co(II). The reagent FFTSC gives yellow colour with Hg(II) and Co(II) mixture solution in basic medium. The maximum peaks were observed in between 360nm - 420nm for both Hg(II) and Co(II) in basic buffer solution of pH 8.5. The molar absorptivity and sandell`s sensitivity of Hg(II) and Co(II)-FFTSC complexes are 2.2x104 L/mol/cm, 4.3x103 L/mol/cm and 0.000454 μg/cm2, 0.00232 μg/cm2 respectively. The stability constant of Hg (II) and Co(II)-FFTSC complexes are 3.495x106 and 5.176x104 respectively. The effect of concentrations of Hg(II) and Co(II) ions on amplitude are also studied. The samples of tap water, distilled water, human tissues and blood samples were analyzed by the proposed method. The results of the samples are good agreement with the certified reference values APARI, CVAAT and AAS methods.Keywords
FFTSC, Simultaneous Spectrophotometry, Mercury (II), Cobalt (II).
- Simultaneous Fourth Order Derivative Spectrophotometric Determination of Cobalt, Nickel and Iron Using Anthrone Phenylhydrazone (APH)
Authors
1 Department of Chemistry, Sri Krishnadevaraya University, Anantapur 515003, AP, IN
Source
Asian Journal of Research in Chemistry, Vol 4, No 4 (2011), Pagination: 579-584Abstract
The reagent anthrone phenylhydrazone (APH) is used for the simultaneous determination of Co(II), Ni(II) and Fe(II) by fourth order derivative spectrophotometric method. The reagent APH gives light yellow colour with Co(II), Ni(II) and Fe(II) solution in basic medium. The maximum peaks were observed between 426.3 nm-625 nm for Co(II), Ni(II) and Fe(II) in basic buffer solution of pH 10. The molar absorptivity and Sandell`s sensitivity of Co(II), Ni(II) and Fe(II)-APH complexes are computed, the molar absorptivity are 1.5x104 L/mol/cm, 2.0x104 L/mol/cm and 1.3x104L/mol/cm respectively. The Sandell`s sensitivity are 0.0066 μg/cm2, 0.005μg/cm2 and 0.0076 μg/cm2 respectively. The stability constant of Co(II), Ni(II) and Fe(II)-APH complexes are 1.530x105, 2.486x104 and 1.049x104 respectively. The effect of various concentrations of Co(II), Ni(II) and Fe(II) ions on amplitude also studied. The samples of grape leaves, sesame, laver, mung bean and alloy samples were analyzed by the proposed method. The results of the food samples and alloy samples are good agreement with the results of APARI, AAS methods.