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Selective kinetic spectrophotometric determination of Copper(II) in food and medicinal leafy samples
Abstract
Export Date: 30 November 2011, Source: Scopus, Language of Original Document: English, Correspondence Address: Chalapathi, P. V.; Department of Chemistry, Sri Venkateswara Arts College(TTD), Tirupathi, A.P., India, Chemicals/CAS: brass, 12597-71-6; hydrogen peroxide, 7722-84-1, References: Judith, T.Z., Peter, T., Thomas, T., Immunotoxicology of environment occupational metals (1998), School of Environment Occupational Metals, School of Medicine, New YorkSharma, B.K., Environmental Chemistry (1997), Goel Publishing House, Meerut, IndiaMalvankar, P.L., Shinde, V.M., (1991) Analyst, 116, p. 1084;
... Hydrazone is a class of organic compounds with structure R 1 R 2 C=NNH 2 and it is been formed by condensation of aldehyde or ketone with hydrazide. Complex forming agents like hydrazone derivatives [1][2][3][4][5][6][7][8][9][10][11][12] are becoming increasingly important in analytical chemistry such as gravimetric, titrimetric, colorimetric and spectrophotometric measurements [1]. Oximes and hydrazones are two different classes of chromogenic reagents widely used for the derivative spectrophotometric determination of metal ions [12]. ...
... Copper is an industrially valuable metal, it is used in preparation of coin, wire, medicine, alloys, fashioning metal products, transportation industry and thermal conductance [8]. Cu (II) forms stable complexes with a number of common organic reagents [1][2][3][4][5][6][7][8][9][10][11][12]. A huge number of organic reagents were reported for the spectrophotometric determination of the copper ion. ...
... A huge number of organic reagents were reported for the spectrophotometric determination of the copper ion. Table-1 shows that copper (II) forms complex with some spectrophotometric reagents like AHCH [1], BIPH [2], HNPH [3], THAPPH [4], CHAPH [7] and BHAPH [7] in 1:2 (metal: ligand) ratio and with some other reagents like AFBH [5], SHZN [6], SAL-BH [8], MSHBH [9], DMAHBH [10], CMHBH [11], HDMBHBH [11] and DM-4-HBH [12] in 1:1 (metal: ligand) ratio. So, we can assume that ligands coordinate with metal ion in a monodentate and bidentate manner through the nitrogen atoms. ...
Hydrazone is a condensed compound of aldehyde or ketone with hydrazide. Hydrazones are very important organic analytical reagent and it is also used for spectrophotometric determination of the metal ion from real and simulated samples. Hydrazones forms various colored complexes with Copper (II) Molybdenum (VI), Nickel (II), Palladium (II), Iron (II), Vanadium (V), Uranium (VI), Aluminum (III), Thorium (IV), Mercury (II), Ruthenium (II), Lead (II), Titanium (II), Cadmium (II), Chromium (VI), Gold (III), Cobalt (II), Zirconium (IV) in 1:1, 1:2 and 2:3(metal: ligand) ratio. Metal complexes of hydrazones give λmax in range 300-590nm (under UV visible region) and at pH range 1-10. Graphical abstract:
... The reliability of the method was assured by analyzing the standard alloys, Brass, Bronze, and Phosphor-Bronze. This method was employed for the determination of Cu(II) in food and medicinal leafy samples and inter compared the experimental values using AAS [7]. Studied spectrophotometric method for determination of Cr(III) with 4-(2-thiazolyl azo)resorcinol, this study shows slowly formation of red complex at pH 5.7, accelerate the complex formation by irradiating the reacting mixture with microwave energy, the absorbance reached it's maximum with 5 min. of irradiation and remain stable [8]. ...
Extraction methods for Cu +2 and Ag + shows optimum pH for extraction was (pH ex =7), for Cu +2 and (pH ex =8) for Ag + , as well as extraction procedure need shaking time (20minutes) for Cu +2 and (15minutes) for Ag + , in addition shows optimum concentration giving higher distribution ratio (D) was (80µg) Cu +2 (2.52×10-4 M) and (60µg) Ag + (1.1×10-4 M), organic solvents effect on distribution ratio (D) for extraction shows there is not any linear relation between dielectric constant (ε) for organic solvents used and distribution ratio (D), but there is effect for organic solvent structure for both ion. Stoichiometry shows coordination complex extracted was (1:2) (Metal:Organic reagent) for Cu +2 , [Cu 2+ (BTABP-) 2 ], but for Ag + was (1:1) (Metal:Organic reagent) [Ag + (BTABP-)], thermodynamic study shows the complexation reaction between metal ion and organic reagent was endothermic for Cu +2 and Ag + , as well as synergistic effect study. From other hand used this method and organic reagent BTABP for spectrophotometric determination of Cu +2 and Ag + in sediments of different locations of Euphrates river in Al-Najaf governorate.
The new organic reagent 2-[Benzo thiazolyl azo]-4,5-diphenyl imidazole was prepared and used as complexing agent for separation and spectrophotometric determination of Cu2+ ion in some samples include plants, soil, water and human blood serum. Initially determined all factors effect on extraction method and the results show optimum pH was (pHex=9), optimum concentration was 40?g/5mLCu2+ and optimum shaking time was (15min.), as well stoichiometry study appears the complex structure was 1:1 Cu2+: BTADPI. Interferences effect of cations were studied. Synergism effect shows MIBK gave increasing in distribution ratio (D). Organic solvent effect appears there is no any linear relation between dielectric constant for organic solvent used and distribution ration (D). Thermodynamically found the reaction was Endothermic reaction, with ?Hex= 0.0131 KJ.mole-1,?Gex=-54.20 KJ.mole-1 ,?Sex= 167.84 J.mole-1.Beer’s law was obeyed over the concentration 1-30?g/5mL, and ?=922.90 Lmol-1.cm-1,with detection limit 1.7×10-5and Sandell’s sensitivity 6.8× 10-7 gcm-2.
The new organic reagent 2-[Benzo thiazolyl azo]-4,5-diphenyl imidazole was prepared and used as complexing agent for separation and spectrophotometric determination of Cu 2+ ion in some samples include plants, soil, water and human blood serum. Initially determined all factors effect on extraction method and the results show optimum pH was (pH ex =9), optimum concentration was 40μg/5mLCu 2+ and optimum shaking time was (15min.), as well stoichiometry study appears the complex structure was 1:1 Cu 2+ : BTADPI. Interferences effect of cations were studied. Synergism effect shows MIBK gave increasing in distribution ratio (D). Organic solvent effect appears there is no any linear relation between dielectric constant for organic solvent used and distribution ration (D). Thermodynamically found the reaction was Endothermic reaction, with ΔH ex = 0.0131 KJ.mole-1 ,ΔG ex =-54.20 KJ.mole-1 ,ΔS ex = 167.84 J.mole-1 .Beer's law was obeyed over the concentration 1-30μg/5mL, and ε=922.90 Lmol-1 .cm-1 ,with detection limit 1.7×10-5 and Sandell's sensitivity 6.8× 10-7 gcm-2 .
This study include synthesis of new organic reagent 2-[(3-Hydroxy phenyl)azo]-4,5-diphenyl imidazole (3-HPADPI) and used it as complexing agent for extraction of Cu 2+ ion from aqueous solutions. The results show the optimum pH ex =8, optimum concentration of Cu 2+ ion was 40µg in 5mL aqueous phase and the optimum shaking time was 10min. Stoichiometry study illustrated the complex structure was 1:1 Cu 2+ :(3-HPADPI). Effect of cations interferences was studied. Synergism effect show MIBK gave increasing of distribution ratio (D). The study of organic solvents effect appear there is not any linear relation between dielectric constant (ε) of organic solvents used and distribution ratio (D). Thermodynamically appear that the reaction was Endothermic reaction with ΔH ex =0.000062 KJ.mole-1 , ΔG ex =-51.46 KJ.mole-1 , ΔS ex = 159.31 J.mol-1 .K-1 .
The new organic reagent 2-[Benzo thiazolyl azo]-4,5-diphenyl imidazole was prepared and used as complexing agent for separation and spectrophotometric determination of Cu 2+ ion in some samples include plants, soil, water and human blood serum. Initially determined all factors effect on extraction method and the results show optimum pH was (pH ex =9), optimum concentration was 40μg/5mLCu 2+ and optimum shaking time was (15min.), as well stoichiometry study appears the complex structure was 1:1 Cu 2+ : BTADPI. Interferences effect of cations were studied. Synergism effect shows MIBK gave increasing in distribution ratio (D). Organic solvent effect appears there is no any linear relation between dielectric constant for organic solvent used and distribution ration (D). Thermodynamically found the reaction was Endothermic reaction, with ΔH ex = 0.0131 KJ.mole-1 ,ΔG ex =-54.20 KJ.mole-1 ,ΔS ex = 167.84 J.mole-1 .Beer's law was obeyed over the concentration 1-30μg/5mL, and ε=922.90 Lmol-1 .cm-1 ,with detection limit 1.7×10-5 and Sandell's sensitivity 6.8× 10-7 gcm-2 .
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