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Sivaramaiah, S.; Reddy, V. Krishna; Reddy, Tarun

doi:10.1023/a:1006731026031

Cited by 7 publications

(3 citation statements)

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“…E s = Absorbance at the stoichiometric molar ratio of the metal to ligand in complex. The average stability constant obtained from two methods is 9.54x10 9 . From mean Ks value, the standard free energy change ∆G 0 at 300 K for the formation reaction of complex has been calculated using the formula.…”

Section: Stability Constants From Job's Methods and Mole-ratio Methodsmentioning

confidence: 98%

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2-Hydroxy-4-lsopropoxy-5-bromoacetophenone Oxime as An Analytical Reagent for Palladium(II) Determination

Desai¹

2014

Chem Sci Trans

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2-Hydroxy-4-isopropoxy-5-bromoacetophenone oxime (HIBAO) has been synthesized and used as an analytical reagent for gravimetric and spectrophotometric determination of Pd(II). In pH range of 2.0 to 6.0 this reagent gives water insoluble yellow coloured complex with Pd(II). The reagent has been used for gravimetric determination of Pd(II). Interference of many cations and anions in gravimetric determination is studied for respective metals. Metal to ligand ratio of the complex has been determined using spectrophotometric methods. The stoichiometry of Pd(II) complex is 1:2 [M:L]. The complex obeys the Beer law up to 53.21 ppm of Pd(II). The molar absorptivity and Sandell's sensitivity of the complex have also been calculated. The stability constant and Gibb's free energy change at 300 K are reported. Applicability of the reagent has been checked by determining palladium in palladised carbon. The IR spectra of ligand and complex has also been studied to establish the nature of linkage of metal ion with ligand.

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Section: Stability Constants From Job's Methods and Mole-ratio Methodsmentioning

confidence: 98%

“…They include o-hydroxy ketoximes [1][2][3][4][5][6][7] , phenyl hydrazones, thiosemicar-bazones [8][9][10] , chalconeoximes 11 etc. These are generally used for spectrophotometric and gravimetric determination of transition metal ions.…”

Section: Introductionmentioning

confidence: 99%

2-Hydroxy-4-lsopropoxy-5-bromoacetophenone Oxime as An Analytical Reagent for Palladium(II) Determination

Desai¹

2014

Chem Sci Trans

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“…The sensitivity expressed as molar absorptivity, as well as the detection limits of the proposed method is compared with those of published spectrophotometric methods (Table 3). The higher sensitivity of the proposed method is notable, greater even than that of other methods, 27,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48] that based on spectrophotometry. Although the measurable concentration range is from approximately 0.5-150 ng L À1 with graphite furnace atomic absorption spectrometry, the proposed method was very simple and accurate.…”

Section: Analytical Characteristicsmentioning

confidence: 99%

Utilization of cloud-point extraction for colorimetric determination of trace amounts of thorium(iv) in real samples

2015

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A cloud point extraction process using mixed micelle of the cationic surfactant CTAB and non-ionic surfactant Triton X-100 to extract thorium(IV) from aqueous solutions was investigated. The method is based on the color reaction of thorium with 5-(2`,4`-dimethylphenylazo)-6-hydroxypyrimidine-2,4-dione (DMPAHPD) in the presence of potassium iodide in hexamethylenetetramine buffer media and mixed micelle-mediated extraction of complex. The optimal extraction and reaction conditions (e.g. surfactant concentration, reagent concentration, effect of time) were studied and the analytical characteristics of the method (e.g. limit of detection, linear range, molar absorptivity, Sandell sensitivity, preconcentration, and improvement factors) were obtained. Linearity was obeyed in the range of 0.5-15 ng mL − 1 of thorium(IV) ion and the detection limit of the method is 0.16 ng mL − 1 . The interference effect of some anions and cations was also tested. The proposed method was successfully applied for the preconcentration of trace thorium in natural water samples as well as in plant material and soil samples prior to its determination by inductively coupled plasma atomic emission spectrometry (ICP-AES) with satisfactory results. A Perkin-Elmer Lambda 12 UV/Vis spectrometer was used for recording absorbance spectra with 1.0-mm quartz cell. A Perkin Elmer model 5300 DV; ICP-AES (Waltham, MA, USA) was used for all ICP-AES measurements. An Orion research model 601 A/digital ionalyzer pH meter was used for checking the pH of solutions. A water bath with good temperature control and a centrifuge with 10-mL calibrated centrifuge tubes (Superior, Germany) were used to accelerate the phase separation process. Tabletop Low Speed Large Capacity Centrifuge model L-550 was used Reagents Unless otherwise stated, reagents of analytical purity were used for all experiments and doubly distilled water (DDW) was used throughout. The surfactants, Triton X-100 and cethyltrimethylammonium bromide (CTAB) (obtained from Sigma company) were used without further purification. Stock solution of thorium at a concentration of 0.025 M thorium(IV) solution is prepared by dissolving 3.675 g of thorium nitrate [Th(NO 3 ) 4 .6H 2 O] in distilled water containing a few drops of nitric acid. The solution is made upto 250 mL and standardized gravimetrically by employing the iodide method. 0.1 M. working standard solutions were obtained by appropriate dilution of the stock. 5-(2`,4`-Dimethylphenylazo)-6-hydroxypyrimidine-2,4-dione (DMPAHPD) was prepared using conventional diazotization and coupling methods. 25 A solution of 1.0×10 − 3 M of DMPAHPD was prepared by dissolving appropriate amounts of this reagent in bidistilled water. The solution pH 7.8 ± 0.2 was adjusted with hexamethylenetetramine (HTM)/ hydrochloric acid buffer. N,N-dimethyl formamide (DMF) solvent and potassium iodide salt were purchased from Merck.

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Direct and Derivative Spectrophotometric Determination of Zinc with 2,4-Dihydroxybenzaldehyde Isonicotinoyl Hydrazone in Potable Water and Pharmaceutical Samples

Sivaramaiah

2005

J Anal Chem

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A simple and sensitive spectrophotometric method is developed for the determination of zinc in aqueous solutions. The metal ion forms a greenish-yellow colored complex with 2,4-dihydroxybenzaldehyde isonicotinoyl hydrazone (2,4-DHBINH) in the pH range of 4-10. The complex shows maximum absorbance at 390 nm and in the pH range of 6-8. Beer's law is obeyed in the range 0.10-1.50 µ g/mL of Zn(II). The molar absorptivity and Sandell's sensitivity are 3.55 × 10 4 mol -1 cm -1 and 0.0016 µ g/cm 2 , respectively. The composition of the complex is 1 : 1. The effect of interfering ions has been studied, and the method was applied to the determination of zinc(II) in potable water and pharmaceutical samples. A fast derivative spectrophotometry method is also proposed for the determination of zinc in the range 0.06-1.60 µ g/mL, which is more sensitive than the zero order method.

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Cited by 7 publications

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2-Hydroxy-4-lsopropoxy-5-bromoacetophenone Oxime as An Analytical Reagent for Palladium(II) Determination

2-Hydroxy-4-lsopropoxy-5-bromoacetophenone Oxime as An Analytical Reagent for Palladium(II) Determination

Utilization of cloud-point extraction for colorimetric determination of trace amounts of thorium(iv) in real samples

Direct and Derivative Spectrophotometric Determination of Zinc with 2,4-Dihydroxybenzaldehyde Isonicotinoyl Hydrazone in Potable Water and Pharmaceutical Samples

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