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Patel N.P.,Shree Jayendrapuri Arts and Science College | Desai K.K.,Institute of Medical Technology
Oriental Journal of Chemistry | Year: 2011

Numerous heterocyclic azo dyes have been reported for the spectrophotometric determination of Cu(II). Here, we report a new heterocyclic azo dye 1-( 2'Chloro-4'-sulphophenyl-S-methyl-azo-(2''carboxy-5"-sulphonic acid)-5-pyrazolone [CSMACSP] for the spectrophotometric determination of Cu(II).The method Is simple, rapid and sensitive. Light green colour 1:1 (M:L) complex formed between Cu(I I) and CSMACSP in the pH rage 2.0-5.0. The absorption spectrum shows as shoulder at 490 nm. The molar absorptivity and Sandell's sensitivity is found to be 0.683×103 lit.mol- 1 cm1 and 0.093 μg/ cm2, respectively. A number of foreign ions are tested for their interference. Elemental analysis and IR spectra of the reagent and its complex were reported. The reagent was successfully applied for the determination of Cu(II) content in brass alloy. Source


Patel N.B.,Shree Jayendrapuri Arts and Science College | Desai K.K.,Institute of Medical Technology
International Journal of ChemTech Research | Year: 2012

The ligand 2,4-dihydroxy-5-bromobutyrophenone oxime [DHBBO] was developed as a new analytical reagent for the gravimetric and spectrophotometric analysis of Ni(II) ion. In the pH range of 7.0 to 10.0 this reagent gives light green precipitate with Ni(II). Job's method of continuous variation and Yoe and Jones mole ratio method revealed the stoichiometry of the complex to be 1:2. The obeyence of Beer's law was studied and the molar absorptivity and Sandell's sensitivity was calculated. The reagent and its complex have been characterized by elemental analysis and IR spectra. The complex was subjected to thermogravimetric analysis to study its decomposition pattern. The reagent has been used for the analysis of german silver. Source


Patel N.B.,Shree Jayendrapuri Arts and Science College | Solanki J.,Shree Jayendrapuri Arts and Science College
Oriental Journal of Chemistry | Year: 2013

2, 4-dihydroxy -5-bromo-α-phenyl acetophenone thiosemicarbazone [DHB-α-PAT] has been used for the spectrophotometric determination of Cu(II). The method is simple, rapid and sensitive. Light green colour 1:2 (M:L) complex formed between Cu(II) and DHB-α-PAT in the pH range 3.0-6.5. The absorption spectrum shows as shoulder at 420 nm. The molar absorptivity and Sandell's sensitivity is found to be 5.018 × 103lit.mol -1.cm-1 and 0.01266 μg/cm2, respectively. A number of foreign ions are tested for their interference. Antibacterial activity, TGA studies, Elemental analysis, 1H1 NMR spectra of Reagent, IR spectra of the reagent and its complex were reported. The reagent has been successfully applied to the determination of Cu(II) in drained microetch solution. Source


Patel N.B.,Shree Jayendrapuri Arts and Science College | Parekh N.H.,Shree Jayendrapuri Arts and Science College
Oriental Journal of Chemistry | Year: 2012

Cu(II) was determined spectrophotometrically after co-precipitation with 2, 4 Dihydroxy-5-bromo[2'-methyl] propiophenone oxime (DHBMPO) at room temperature. Obeyance of Beer's law was found and from that Molar absorptivity and Sandell's sensitivity were calculated. Composition of chelate was determined using Job's method of continuous variation and Yoe and Jones mole ratio method. The stability constant and Gibb's free energy change were also determined spectrophotometrically. From TGA, the energy of activation was also calculated using Broido method for the first and second step decomposition. The reagent has been satisfactorily applied for the determination of copper in drain micro etch solution. Source


Patel N.B.,Shree Jayendrapuri Arts and Science College | Parekh N.H.,Shree Jayendrapuri Arts and Science College
International Journal of ChemTech Research | Year: 2013

Co(II) was determined spectrophotometrically after co-precipitation with 2, 4 Dihydroxy-5- bromo[2'-methyl] propiophenone oxime (DHBMPO) at room temperature at pH 7.0 in chloroform at 440nm. Beer's law was obeyed upto 11.79 ppm of Co(II). Molar absorptivity and Sandell's sensitivity were found to be 2.125 x 103 lit mol-1 cm-1 & 0.02773 μg/cm2 respectively. Composition of chelate was determined using Job's method of continuous variation and Yoe and Jones mole ratio method which was found to be 1:2 (M:L). The stability constant determined spectrophotometrically was found to be 1.23 x 1010. Gibb's free energy change for complex formation reaction was also calculated and found to be -13.85 k cal/mol. From TGA, the energy of activation was calculated using Broido method and found to be 12.54 K Cal/mol for first step and 14.57 K Cal/mol for second step decomposition. The reagent has been satisfactorily applied for the determination of cobalt in pure Co-metal sample. Source

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