Sequential extraction procedure for determination of uranium, thorium, radium, lead and polonium radionuclides by alpha spectrometry in environmental samples

2006 ◽  
Vol 56 (S4) ◽  
pp. D545-D555 ◽  
Author(s):  
J. M. Oliveira ◽  
F. P. Carvalho
Keyword(s):  
Sequential Extraction ◽  
Environmental Samples ◽  
Alpha Spectrometry ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure

Thallium fractionation in polluted environmental samples using a modified BCR three-step sequential extraction procedure and its determination by electrothermal atomic absorption spectrometry

2008 ◽  
Vol 62 (2) ◽  
Author(s):  
Ján Medved’ ◽  
Milan Kališ ◽  
Ingrid Hagarová ◽  
Peter Matúš ◽  
Marek Bujdoš ◽  
...  
Keyword(s):  
Sequential Extraction ◽  
Reference Materials ◽  
Environmental Samples ◽  
Limit Of Detection ◽  
Certified Reference Materials ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Extraction Procedure ◽  
Sequential Extraction Procedure ◽  
Residual Fraction

AbstractDetermination of thallium in polluted environmental samples and their extracts obtained by a modified BCR three-step sequential extraction procedure was used to study thallium distribution and mobility in the monitored polluted area affected by acidification (Šobov, Central Slovakia). The results of fractionation applied to 5 soil certified reference materials and 14 environmental samples show that the vast majority of thallium occurred in the residual fraction. This means that highly toxic thallium is strongly entrapped in the parent rock materials remains immobile and its environmental toxicity is therefore reduced. The limit of detection for thallium in the studied fractions was lower than 0.050 mg kg−1, the precision (RSD) of the ultratrace determination of thallium in the studied fractions was better than 17 % and the accuracy of the used method was verified by analyzing certified reference materials.

Sequential Extraction Procedure for the Determination of Some Trace Elements in Fertilizer Samples

2014 ◽  
Vol 97 (4) ◽  
pp. 1034-1038 ◽  
Author(s):  
Yunus Emre Unsal ◽  
Mustafa Tuzen ◽  
Mustafa Soylak
Keyword(s):  
Sequential Extraction ◽  
Total Concentration ◽  
Extraction Procedure ◽  
Absorption Spectrometry ◽  
Sequential Extraction Procedure ◽  
Sufficient Information ◽  
Dilute Acid ◽  
Flame Atomic Absorption ◽  
Mn Oxides

Abstract Total concentration of metal ions at trace levels does not give sufficient information about toxicity and biological availability of these elements in fertilizer samples. In the presented work, a sequential extraction procedure modified by the European Community Bureau of Reference (BCR) was applied to fractionate Cd, Cr, Co, Cu, Fe, Pb, Mn, Ni, and Zn levels in two fertilizer samples collected from cooperative agricultural retailers. The fractions extracted were exchangeable/dilute acid soluble, reducible bound to Fe/Mn oxides, oxidizable bound to organic matter and sulfides, and residual. The determination of analyte elements was done by flame atomic absorption spectrometry. The accuracy of the procedure was validated with BCR-701 sediment certified reference material. The RSD of the procedure was less than 10%.

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