scholarly journals EXTRACTION CONCENTRATING OF SCANDIUM (III) IN COMPLEX FORM WITH 2-HYDROXY-5-T-BUTYLPHENOL-4-METOXYAZOBENZENE AND ITS DETERMINATION BY ATOMIC-ABSORPTION SPECTROMETRY

2021 ◽  
Vol 0 (4) ◽  
pp. 49-52
Author(s):  
A.M. Pashajanov ◽  
◽  
S.I. Niftaliyev ◽  
M.M. Agamaliyeva ◽  
S.M. Bayramov ◽  
...  
Keyword(s):  
Stability Constant ◽  
Atomic Absorption ◽  
Complex Form ◽  
Absorption Spectrometry ◽  
Optimum Conditions ◽  
Spectrophotometric Methods ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Light Absorbance

Complexation of scandium 2-hydroxy-5-T-butylphenol-4-metoxyazobenzene (HR) was studied by atomic-absorption and spectrophotometric methods. Optimum conditions of formation and extraction of the complex were found. Maximum light absorbance of a complex in n-butanol is in the range of 470÷480 nm. Molar absorption coefficient equals to (2.2–3.0).104. Stability constant of scandium in n-butanol is л=2.8·1010. Selective and sensitive techniques of extraction-atomic absorption determination of scandium in soils were developed

Solvent Extraction and Flameless Atomic Absorption Determination of Arsenic in Biological Materials

1980 ◽  
Vol 63 (3) ◽  
pp. 496-499 ◽  
Author(s):  
Nancy Thiex
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Biological Materials ◽  
Rat Tissues ◽  
Flameless Atomic Absorption ◽  
Atomic Absorption Determination ◽  
Coefficients Of Variation ◽  
Absorption Determination ◽  
Flameless Atomic Absorption Spectrometry

Abstract This method for the determination of arsenic specifies wet digestion of biological materials, followed by reduction of arsenic(V) to arsenic(III) and extraction of arsenic(III) with diethylammonium diethyldithiocarbamate (DDDC) in chloroform. The extract is analyzed by flameless atomic absorption spectrometry (AAS). Recoveries of arsenic from plant and animal tissues ranged from 88 to 108%, averaging 99%. Analyses of rat tissues, using a radioisotope technique, averaged 103% of theoretical. Repeatability studies on rat tissues showed the method to be consistent with coefficients of variation ranging from 3.0 to 8.5%, and a test for ruggedness showed that the method is not affected by slight variations in procedure, but is affected by the presence of Fe and Cu. The method is sensitive to about 0.04 μg arsenic in the total digest (injections of 20 μl of a 4 ng/mL solution).

scholarly journals Extraction-Atomic-Absorption Determination of Germanium with 2Hydroxy-5-T-Butylphenol-4-Methoxy-Azobenzene

2016 ◽  
Vol 12 (6) ◽  
pp. 4112-4116
Author(s):  
A.M. Pashajanov
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Determination ◽  
Straight Line ◽  
Absorption Determination ◽  
Benzene Toluene ◽  
Complex Ratio ◽  
Light Absorbance ◽  
Ratio Of Components ◽  
Straight Line Method

The interaction of germanium with 2-hydroxy-5-T-butylphenol-4-methoxy-azobenzene (HR) was studied. Optimum values of pH of solution are 3.5÷4.0. Maximum light absorbance of the complex in n-butanol is in the range of 470÷480 nm. Chloroform, dichloroethane, carbon tetrachloride, benzene, toluene, xylene, hexane and n-butanol were tested for extraction of the complex. The most effective extractant was found to be n-butanol used in further studies. Absorption spectrum indicates the formation of one complex.  Ratio of components in the complex under optimum conditions were found by method of equilibrium shift and straight-line method of Asmus, they are equal to Ge:HR = 1:2. Selectivity of extraction-atomic absorption determination of germanium was studied by using HR. Molar absorption coefficient equals to (4.0±4.2)·104. Beer’s law was observed at concentrations of germanium 1÷10 mkg/ml. Stability constant of germanium in n-butanol was found to be βк=3.4·106. Calibration curve was linear at concentrations of germanium 1÷10 mkg/ml. Selective and sensitive techniques of extraction-atomic absorption determination of germanium in different regions were developed.

scholarly journals Preconcentration of Co, Ni, Cd and Zn on naphthalene 2,4,6- trimorpholino-1,3,5-triazin adsorbent and flame atomic absorption determination

2010 ◽  
Vol 75 (5) ◽  
pp. 669-679 ◽  
Author(s):  
Tayyebeh Madrakian ◽  
Ali Zolfigol ◽  
Fathemeh Aboulghazi
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Flame Atomic Absorption ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Relative Standard ◽  
Preconcentration Factor ◽  
Preconcentration Method

A preconcentration method was developed for the determination of trace amounts of Co, Ni, Cd and Zn by atomic absorption spectrometry. The method is based on the retention of the metal cations by naphthalene- 2,4,6-trimorpholino-1,3,5-triazin adsorbent in a column. The adsorbed metals were then eluted from the column with hydrochloric acid and the Co, Ni, Cd and Zn were determined by flame atomic absorption spectrometry. The optimal extraction and elution conditions were studied. The effects of diverse ions on the preconcentration were also investigated. A preconcentration factor of 250 for Co(II), Ni(II) and Zn(II), and 400 for Cd(II) can easily be achieved. Calibration graphs were obtained and the detection limits of the method for Co(II), Ni(II), Cd(II) and Zn(II) were 0.51, 0.49, 0.17 and 0.10 ng mL-1, respectively. The relative standard deviations (RSD) of 0.37-2.31 % for Co, 0.37-3.73 % for Ni, 2.20-2.40% for Cd and 1.50-2.56% for Zn were obtained. The method was also used for the simultaneous preconcentration of these elements and the method was successfully applied to their preconcentration and determination. The method was applied to the determination of Co, Ni, Cd and Zn in several real samples.

scholarly journals EXTRACTION AND ATOMIC-ABSORPTION DETERMINATION OF PALLADIUM ON THE BASIS OF THE COMPLEXATION REACTION WITH 2-HYDROXY-5-T-BUTYLPHENOL-4-METHOXY-AZOBENZENE

2015 ◽  
Vol 11 (9) ◽  
pp. 3779-3783
Author(s):  
Aydin Pashajanov
Keyword(s):  
Complex Formation ◽  
Absorption Coefficient ◽  
Atomic Absorption ◽  
Calibration Curve ◽  
Complexation Reaction ◽  
Optimum Conditions ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Cation Complex

Complexation ofPd(II) with 2-hydroxy-5-T-butylphenol-4¢-methoxy-azobenzene(HR) have been researched. The optimum conditions of complex formation and its extraction with chloroform and n-butanol, providing the required fullness of binding of palladium ions were found.Stability constant of the cation complex PdR+ (lgKst=4.3∙1012), and the equilibrium constant of complexation reaction (3.42∙104) were calculated by Komar method. Molar absorption coefficient equals to (4.3±0,1)∙104. The calibration curve was linear at concentrations of palladium 1¸10 mcg / mL.Selective and sensitive technique of extraction-atomic absorption determination of palladium in alloys were developed.

Atomic absorption determination of Hg (II), Cd (II), and As (III) in natural and waste water after preliminary group preconcentration

2019 ◽  
Vol 85 (2) ◽  
pp. 12-16
Author(s):  
I. V. Saunina ◽  
E. N. Gribanov ◽  
E. R. Oskotskaya
Keyword(s):  
Waste Water ◽  
Atomic Absorption ◽  
High Sensitivity ◽  
Distribution Coefficients ◽  
Neutral Medium ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Relative Standard ◽  
Preliminary Group

The sorption of Hg (II), Cd (II), and As (III) by natural aluminosilicate is studied. It is shown that the mineral absorbs those toxicants in a rather wide pH range, quantitative extraction of analytes being achieved in a neutral or close to neutral medium (pH values range within 7.0 - 8.0; 6.3 - 7.5; 7.4 - 8.5 for Hg (II), As (III), and Cd (II), respectively). The effect of the time of phase contact on the degree of extraction of elements is shown. The sorption capacity of the mineral in optimal conditions of the medium acidity (0.06 mmol/g for mercury, 0.31 mmol/g for cadmium, and 0.52 mmol/g for arsenic) is determined. The distribution coefficients attain values of aboutnX 103-nX 104. A new combined method for determination of Hg (II), Cd (II), and As (III) in natural and waste water is developed and tested. The method consists in a preliminary group sorption concentration of the analytes by aluminosilicate, desorption of the analytes from the surface of the mineral and their subsequent atomic absorption determination. The correctness of the method is verified in analysis of spiked samples. The method is easy to use and exhibits high sensitivity, reproducibility and accuracy of analyte determination. The relative standard deviation does not exceed 0.13. Economic availability and possibility of using domestic sorption materials are the important advantages of the proposed procedure which can be used in the practice of laboratories monitoring the quality and safety of environmental objects.

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.

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