The reactions of gallium, indium and thallium with 2-(2-pyridylazo)-1-naphthol-4-sulphonic acid and their spectrophotometric determination

1980 ◽  
Vol 45 (1) ◽  
pp. 54-79 ◽  
Author(s):  
Petr Voznica ◽  
Josef Havel ◽  
Lumír Sommer
Keyword(s):  
Reaction Mechanism ◽  
Spectrophotometric Determination ◽  
Graphical Analysis ◽  
Sulphonic Acid ◽  
Complete Picture ◽  
Optimum Conditions ◽  
Complex Equilibria ◽  
Absorbance Data

The complex equilibria of gallium, indium and thallium(III) with analytically important 2-(2-pyridylazo)-1-naphthol-4-sulphonate were studied spectrophotometrically using graphical analysis of the absorbance curves and minimization procedures for the absorbance data using the SPEKTFOT program on the Tesla 200 computer. The study yielded a complete picture of the reaction mechanism of these elements with heterocyclic azodyes. Optimum conditions for the spectrophotometric determination of gallium, indium and thallium using this reagent were found.

Complex equilibria and spectrophotometric determination of copper with 4-(2-pyridylazo)resorcinol and 4-(2-thiazolylazo)resorcinol

1980 ◽  
Vol 45 (5) ◽  
pp. 1502-1524 ◽  
Author(s):  
Aleš Hrdlička ◽  
Marie Langová
Keyword(s):  
Spectrophotometric Determination ◽  
Bathochromic Shift ◽  
Graphical Analysis ◽  
Alkaline Media ◽  
Numerical Treatment ◽  
Weakly Alkaline ◽  
Complex Equilibria ◽  
Absorbance Data ◽  
Determination Of Copper

The complex equilibria of copper with 4-(2-pyridylazo)resorcinol and 4-(2-thiazolylazo)resorcinol were studied spectrophotometrically using graphical analysis and numerical treatment of the absorbance data by the PRCEK or SPEKTFOT program on a Tesla 200 computer. Of the two reagents, 4-(2-pyridylazo)resorcinol forms more complexes including the 1 : 2 complexes, with a greater bathochromic shift of λmax with respect to the reagent. Especially the CuL2-2 complex of 4-(2-pyridylazo)resorcinol with ε = 7.9 . 104 at 500 nm permits sensitive spectrophotometric determination of copper. Procedures for the spectrophotometric determination of copper in weakly alkaline media were evaluated.

Atomic absorption spectrometry of cobalt in the presence of chelating agents

1980 ◽  
Vol 45 (12) ◽  
pp. 3313-3319 ◽  
Author(s):  
Josef Komárek ◽  
Dalibor Kolčava ◽  
Lumír Sommer
Keyword(s):  
Reaction Mechanism ◽  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Chelating Agents ◽  
Absorption Spectrometry ◽  
Donor Atom ◽  
Optimum Conditions

The effect of chelating agents on the determination of cobalt in various flames, in a graphite cuvette and tantalum boat was studied considering the expected reaction mechanism of the atomization of cobalt and the reagent donor atom. A marked increase in the sensitivity of the determination of cobalt was observed in the presence of 1-(2-pyridylazo)-2-naphthol, pyrrolidinedithiocarboxylate, diethyldithiocarbamate, 8-mercaptoquinoline, 8-hydroxyquinoline and thenoyltrifluoroacetone for atomization from a tantalum boat. The optimum conditions for the determination of cobalt in the presence of 1-(2-pyridylazo)-1-naphthol are given.

Resonance Rayleigh Scattering for the Determination of Chlorpromazine and Promethazine

2006 ◽  
Vol 59 (12) ◽  
pp. 915 ◽  
Author(s):  
Lanxiang An ◽  
Shaopu Liu ◽  
Zhongfang Liu ◽  
Ling Kong ◽  
Xiaoli Hu
Keyword(s):  
Reaction Mechanism ◽  
Drug Concentration ◽  
Rayleigh Scattering ◽  
Ion Association ◽  
Resonance Rayleigh Scattering ◽  
Optimum Conditions ◽  
Serum Samples ◽  
Spectroscopic Characteristics ◽  
Urine And Serum

Chlorpromazine (CPZ) and promethazine (PZ) can react with potassium ferrioxalate (PF) to form 3:1 ion-association complexes, which can result in a significant enhancement of resonance Rayleigh scattering (RRS) intensity. The maximum scattering peaks are located at 368 nm for CPZ-PF and 370 nm for PZ-PF. The RRS spectroscopic characteristics, the optimum conditions of reactions, and influencing factors have been studied for CPZ-PF and PZ-PF. There is a linear relationship between the RRS intensity and the drug concentration in the range of 0.02–8.00 μg mL–1 for CPZ and 0.04–9.00 μg mL–1 for PZ, and the detection limits (3σ) are 6.6 ng mL–1 for CPZ and 10.6 ng mL–1 for PZ. The proposed method has been applied to determine CPZ in urine and serum samples with satisfactory results. Moreover, the reaction mechanism and the reasons for intensity enhancement of RRS have been discussed.

On the spectrophotometric determination of with 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol

1988 ◽  
Vol 66 (3) ◽  
pp. 401-405 ◽  
Author(s):  
Lumír Sommer ◽  
Eva Šamlotová
Keyword(s):  
Spectrophotometric Determination ◽  
Natural Water ◽  
Water Samples ◽  
Sodium Sulphate ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Masking Agents ◽  
Triton X ◽  
Sulphosalicylic Acid

2-(5-Bromo-2-pyridylazo)-5-diethylaminophenol (5-Br-PADAP) is a suitable reagent for the spectrophotometric determination of uranium but results are easily influenced by the reaction conditions as well as various common ions and masking agents. Optimum conditions, which must be carefully maintained, are 30% (v/v) dimethylformamide, 0.1% triton X-100, ≥ 8 × 10−5 M 5-Br-PADAP, 8 × 10−2 M triethanolamine, 7 × 10−3 M sodium fluoride, 10−2 M 5-sulphosalicylic acid, and 579 nm. Sodium sulphate (10−2 M) and CDTA (5.7 × 10−3 M) may serve as additional masking agents. A previous separation of uranium by extraction with 0.1 M tri-n-octylamine in benzene from 4 M HCl and re-extraction of 0.3 M HCl is recommended for analysis of natural water samples.

Spectrophotometric determination of peroxymonosulfate anions via oxidative decolorization of dyes induced by cobalt

2016 ◽  
Vol 8 (5) ◽  
pp. 973-978 ◽  
Author(s):  
J. Q. Zhang ◽  
J. Ma ◽  
J. Zou ◽  
H. Z. Chi ◽  
Y. Song
Keyword(s):  
Spectrophotometric Determination ◽  
Maximum Absorption ◽  
Optimum Conditions ◽  
Good Linear ◽  
Linear Correlations ◽  
Decolorization Of Dyes

Dyes can be decolorized by the activation of peroxymonosulfate (PMS) in the presence of cobalt, and four good linear correlations between the depletion of dyes at their maximum absorption wavelengths and the concentration of PMS are demonstrated under the optimum conditions.

Complex equilibria and spectrophotometric determination of mercury(II) with Lawsone

1990 ◽  
Vol 121 (6-7) ◽  
pp. 481-492 ◽  
Author(s):  
Magda S. Saleh ◽  
Kamal A. Idriss ◽  
Hassan Sedaira ◽  
Sherif K. Idriss
Keyword(s):  
Spectrophotometric Determination ◽  
Complex Equilibria

Spectrophotometric study of complexation equilibria and of a method for the determination of Fe(III) ions with 4-(2-pyridylazo)resorcinol and 4-(2-thiazolylazo)resorcinol

1979 ◽  
Vol 44 (2) ◽  
pp. 374-392 ◽  
Author(s):  
Ellena Russeva ◽  
Vlastimil Kubáň ◽  
Lumír Sommer
Keyword(s):  
Stability Constants ◽  
Spectrophotometric Determination ◽  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Component Concentration ◽  
Optimum Conditions ◽  
Ferric Ions ◽  
Absorption Coefficients ◽  
Basic Parameters

The composition, molar absorption, coefficients, equilibrium constants and stability constants for the MLH, ML, M(LH)2 and ML2 complexes have been determined graphically using slope-intercept transformations and numerically from the absorbance-pH curves and from the absorbance dependence on the component concentration, using the PRCEK III and SPEKTFOT programs, or from the continuous variation plots using the JOBCON program. The optimum conditions were found for a spectrophotometric determination of ferric ions with TAR and PAR reagents in pure solutions. The basic parameters of the analytical curves were evaluated using the STAT program.

scholarly journals Kinetic-Spectrophotometric Determination of Iodide Based on its Inhibitory Effect on the Decolorization Reaction of Methyl Orange

2009 ◽  
Vol 6 (4) ◽  
pp. 1267-1273
Author(s):  
Reyhaneh Rahnama Kozani ◽  
Ferydoun Ashrafi ◽  
Masuod Khalilnezhad ◽  
Mohammad Reza Jamali
Keyword(s):  
Methyl Orange ◽  
Spectrophotometric Determination ◽  
Limit Of Detection ◽  
Inhibitory Effect ◽  
Calibration Graph ◽  
Reaction Products ◽  
Optimum Conditions ◽  
Relative Standard ◽  
Kinetic Spectrophotometric

A simple, sensitive, rapid and reliable method has been developed for spectrophotometric determination of iodide based on its inhibition effect on the redox reaction between bromate and hydrochloric acid. The decolorization of methyl orange by the reaction products was used to monitor the reaction spectrophotometrically at 525 nm. The variables affecting the rate of the reaction were investigated. Under the optimum conditions, the limit of detection is 1.5 × 10-7mol L-1and calibration range is 2.0 × 10-6–1.3 × 10-4mol L-1of iodide. The linearity range of the calibration graph is depends on bromate concentration. The relative standard deviation of ten-replication determination of 8.2 × 10-5mol L-1iodide was 1.4%. The proposed method was applied to the determination of iodide in natural water samples with satisfactory results.

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