Analytical Reagent For Spectrophotometric Determination Research Articles

New Method of Synthesis of Calix-4-arenes as Analytical Reagent for Spectrophotometric Determination of Iron (III)

A compound of Calix-4-arenes was prepared, as a sensitive and selective spectrophotometric method was proposed for the rapid determination of Iron (III)in analytical sample, the proposed method was based on the formation blue complex with Calix-4-arenes as a chromogenic reagent that has a highly absorption at λmax 592 nm. The reaction was instantaneous at pH=7.0, the absorbance of complex was stable for about 24hr. Linearity was observed from1.18 -8.0 μg.ml-1 with detection limit of 0.75μg.ml-1. Recovery and relative error values of precision and accuracy of method were found to be R.S.D.% = 0.92%,Re% = 99.45% and Erel = 0.55 % . The nature of complex showed that (Metal : Ligand) ratio was 1:1 at pH=7and the stability constant of ( 0.422x1010 L1.mole-1).The influence of chemical iand physical parameter and are evaluated . The proposed method was applied successfully to determine Fe (III) in analytical sample

ChemInform Abstract: 2-Hydroxy-1-acetonaphthone Oxime as an Analytical Reagent for Spectrophotometric Determination of Iron(III) and Fluoride.

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9-(2,4-dihydroxyphenyl)-2,3,7-trihydroxyl-6-fluorone as analytical reagent for spectrophotometric determination of molybdenum in plant tissues

A highly sensitive and selective spectrophotometric method is proposed for direct determination of trace molybdenum in plant tissues. The method is based on the reaction of molybdenum (VI) with a new analytical reagent 9-(2,4-dihydroxyphenyl)-2,3,7-trihydroxyl-6-fluorone (DHPTHF). Under optimum reaction conditions, DHPTHF reacts with molybdenum (VI) and forms a red complex with the maximum absorption peak at 523 nm. The color reaction is rapidly completed and the absorbance remains stable for at least a week at room temperature. The apparent molar absorption coefficient, the limit of quantification and the limit of detection were 1.4×10 5 L mol −1 cm −1, 6.6 ng mL −1 and 2.0 ng mL −1, respectively. A linear absorbance was obtained for 0–6 μg of molybdenum (VI) in 10 mL solution. The effect of various substances on the determination of molybdenum was also investigated in detail. Results indicated that most of the studied co-existing substances can be tolerated in considerable amounts, e.g. 150 mg of Ca (II), 100 mg of Mg (II), 5.0 mg of Fe (III) and 50 mg of Zn (II), and do not interfere with the determination of molybdenum. The proposed method offered the advantages of sensitivity, rapidity, selectivity and simplicity without any prior separation or extraction. Moreover, the synthesis and physical and chemical properties of the reagents were also studied.

Diformylhydrazine as analytical reagent for spectrophotometric determination of iron(II) and iron(III).

The bidentate ligand diformylhydrazine (OHC-HN-NH-CHO), DFH, combines with iron(II) and iron(III) in alkaline media in the pH range 7.3-9.3 to form an intensely colored red-purple iron(III) complex with an absorption maximum at 470 nm. Beer's law is obeyed for iron concentrations from 0.25 to 13 microg mL(-1). The molar absorptivity was in the range 0.3258x10(4)-0.3351x10(4) L mol(-1) cm(-1) and Sandell's sensitivity was found to be 0.0168 microg cm(-2). The method has been applied to the determination of iron in industrial waste, ground water, and pharmaceutical samples.

3-Hydroxy-2-(2-thienyl)-4H-chromen-4-one as an Analytical Reagent for Spectrophotometric Determination of Vanadium(v)

3-Hydroxy-2-(2-thienyl)-4H-chromen-4-one as an Analytical Reagent for Spectrophotometric Determination of Vanadium(v)

(N, N, N’, N’-Tetramethy -p- phebylebediamine dihydrochloride) as a New Analytical Reagent for Spectrophotometric Determination of Iron (III). (Fadhil M. Najib and Nawzad N. Ahmad)

New reagent N, N,-N,-N - Tetramethyl-pe phenylenediamine dihydrochloride (TMPDA-2HCl) was described for the determination of Iron (II) spectrophotometrically. Beer's Law was obeyed between (0.4- 2.4 ppm) Iron (III). Optimum conditions were : pH(2-3), λmax= 560 nm, 2ml (0.001M) reagent freshly prepared for final 25ml solution containing 10 to 60 μg [i .e. 0.4-2.4 ppm Fe(III)], color develops after 10 minutes and remains stable for three hours.
 Best Straight line drawn by the method of least square gave correlation coefficient of (0.999) between (0 - 2 ppm). At lower limit of Fe(III) determination (0.4 ppm), maximum error did not exceed 5% in the presence of accumulative interfering ions with coefficient of variation of 1.8% there values, for 2 ppm Fe(III), were less that 4% and 0.34% respectively. Average extinction coefficient was about (1.5 x 10^4 L.mol-1. cm-1). The Stoichiometry of the complex [ Fe(III) - R ] was 1:1.
 Interferences of 27 ions were studied for their tolerance levels. Only few ions interfered seriously which were Cu2+, Ag+, Zn2+, Sn2+, C2O42-, and F-.

Metal chelates of some Schiff base ligands. Chelating tendencies of 2,5-pyrrolediylbis[ N-( o-hydroxyphenylaldimine)] (SBH 2)

The synthesis, acid-base equilibria and metal-ion chelating tendencies of 2,5-pyrrole-diylbis [ N-( o-hydroxyphenylaldimine)] (SBH 2) are reported. From potentiometric equilibrium measurements of hydrogen-ion concentration at 10, 20, and 30°C and ionic strength 0.10 M KNO 3 in 75% ( v v ) dioxan-water medium, the stability constants and the thermodynamic parameters (free energy, enthalpy and entropy) of SBH 2 complexes with transition, non-transition and lanthanide ions have been evaluated. The higher values of free energy Δ G, enthalpy Δ H and entropy Δ S of copper(II) complexes compared with those of other metal complexes were attributed to the unique electron configuration d 9 of Cu(II) ions, which is subject to the Jahn-Teller effect. The relation between the thermodynamic parameters of lanthanide complexes and the reciprocal of the cationic radius (1 / r) of lanthanide cations was not linear, as would be expected from the ionic model. The use of SBH 2 as an analytical reagent for spectrophotometric determination of copper, nickel, cobalt, and uranium is discussed.

2-Hydroxy-1-acetonaphthoneoxime as an Analytical Reagent for Spectrophotometric Determination of Iron(III) and Fluoride

2-Hydroxy-1-acetonaphthoneoxime as an Analytical Reagent for Spectrophotometric Determination of Iron(III) and Fluoride

2-Amino-4-phenyl-5-phenylazothiazole as an Analytical Reagent for Spectrophotometric Determination of lron(III)

2-Amino-4-phenyl-5-phenylazothiazole as an Analytical Reagent for Spectrophotometric Determination of lron(III)

N-N′-bis(pyridinylmethylene)ethylenediamine as an analytical reagent for spectrophotometric determination of copper: Determination of the stoichiometry of the system copper-reagent-perchlorate

The influence of different experimental parameters on the formation of the cuprous orange complex with N-N′-bis(pyridinylmethylene)ethylenediamine was studied, and the optimum experimental conditions for the spectrophotometric determination of copper were established. Beer's law is obeyed between 1 and 10 ppm of copper, and the precision of the procedure, expressed in terms of relative standard deviation, was 0.31%. A study of the interference caused by numerous ions was carried out. The procedure is very selective. Finally, to calculate the charge of the copper complex, a new method for determining the stoichiometry of ion associations formed by extraction is proposed.

Di-2-pyridyl Ketone 4-Phenyl-3-thiosemicarbazone as an Analytical Reagent for Spectrophotometric Determination of Iron

Abstract The analytical possibilities of di-2-pyridyl ketone 4-phenyl-3-thiosemicarbazone as reagent for the spectmphotometric determination of iron have been examined, and compared with other reagents with the some reactive grouping. Diverse procedures for the estimation of iron have been established, and have been applied to the determination of iron in cements and aluminium.

2-benzoylpyridine-4-phenyl-3-thiosemicarbazone as an analytical reagent for spectrophotometric determination of iron

The analytical possibilities of 2-benzoylpyridine-4-phenyl-3-thio- semicarbazone as reagent for the spectrophotometric determination of iron have been examined, and compared with other reagents with the same reactive grouping. Two procedures for the estimation of iron have been established.

3-hydroxypicolinaldehyde thiosemicarbazone as an analytical reagent for spectrophotometric determination of cobalt.

The analytical possibilities of 3-hydroxypicolinaldehyde thiosemicarbazone were examined, and compared with those of picolinaldehyde thiosemicarbazone. Reactions with cobalt(II), nickel, iron(II) and (III), and copper(II) have been studied. A spectrophotometric procedure for the determination of cobalt has been established.