scholarly journals Lead and cadmium atomic absorption determination in solid carbonized food samples using flame-furnace atomizer

2014 ◽  
Vol 12 (3) ◽  
pp. 386-390
Author(s):  
Kostyantyn Lugovyy ◽  
Olexander Buhay ◽  
Antonina Alemasova
Keyword(s):  
Atomic Absorption ◽  
Food Samples ◽  
Chemical Modifiers ◽  
Lead And Cadmium ◽  
Atomic Absorption Determination ◽  
Absorption Determination ◽  
Exponential Factors ◽  
Flame Furnace ◽  
Apparent Activation Energies ◽  
Selection Of

AbstractDirect atomic absorption solid sampling analysis using flame-furnace atomizer enables a significant decrease in the analysis duration, to avoid sample pollution and to exclude toxic reagents. The selection of the chemical modifiers decreasing the detection limit and improving the results repeatability is based on the analyte’s free atoms formation mechanism. The developed kinetic approach has allowed to determine pre-exponential factors k0 and apparent activation energies Ea of atomization processes for Pb(II) and Cd(II) compounds and to propose effective chemical modifiers sodium N,N-diethyldithiocarbamate and urea for food samples. The express and precision technique for lead and cadmium determination in food, using proposed chemical modifiers and carbonization techniques was developed.

scholarly journals Kinetic study of atomization in atomic absorption analysis of solid samples using flame-furnace atomizer

2010 ◽  
Vol 8 (6) ◽  
pp. 1244-1250 ◽  
Author(s):  
Kostyantyn Lugovyy ◽  
Olexander Buhay ◽  
Antonina Alemasova
Keyword(s):  
Atomic Absorption ◽  
Absorption Spectrometry ◽  
Soil Samples ◽  
Chemical Modifiers ◽  
Lead And Cadmium ◽  
Exponential Factors ◽  
Flame Furnace ◽  
Apparent Activation Energies ◽  
Direct Solid

AbstractDirect solid sampling analysis in atomic absorption spectrometry using flame-furnace atomizer allows to significantly decrease analysis duration, to avoid sample pollution and to exclude toxic reagents. The choice of chemical modifiers that decreases the detection limit and improves the repeatability of results is based on the mechanism of analyte-free atom formation. The kinetic approach developed here allows determination of pre-exponential factors k0 and apparent activation energies Ea of the atomization processes for Pb(II) and Cd(II) compounds and enables use of CaCO3 and KHF2 as effective chemical modifiers for soil samples. A fast and precise technique for lead and cadmium determination in soils using the proposed chemical modifiers was developed.

Atomic Absorption Determination of Boron in Foods

1971 ◽  
Vol 54 (5) ◽  
pp. 1138-1139
Author(s):  
Walter Holak
Keyword(s):  
Atomic Absorption ◽  
Methyl Isobutyl Ketone ◽  
Food Samples ◽  
Organic Layer ◽  
Absorption Method ◽  
Methyl Isobutyl ◽  
Isobutyl Ketone ◽  
Atomic Absorption Determination ◽  
Absorption Determination

Abstract A rapid and specific atomic absorption method is presented for the determination of boron as boric acid, which is usually added to foods at the 0.5% level. The sample is digested with sulfuric acid, nitric acid, and 30% hydrogen peroxide. Boron is then chelated with 2-ethyl-l,3-hexanediol and extracted into methyl isobutyl ketone. Absorption due to boron is measured in the organic layer and compared to standards similarly extracted and measured. Recovery studies with food samples indicate that the method may be applicable to a wide variety of foods.

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.

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