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Öğe DETERMINATION OF BISMUTH, CADMIUM AND LEAD IN SOIL EXTRACTS BY ATOMIC-ABSORPTION SPECTROMETRY WITH LOOP SAMPLE INTRODUCTION(Elsevier Science Bv, 1987) GUCER, S; DEMIR, M[Abstract Not Available]Öğe DETERMINATION OF CADMIUM AND LEAD IN VEGETABLES AFTER ACTIVATED-CARBON ENRICHMENT BY ATOMIC-ABSORPTION SPECTROMETRY(Royal Soc Chemistry, 1995) YAMAN, M; GUCER, SAn enrichment method has been developed for the determination of cadmium and lead in vegetable matter by name atomic absorption spectrophotometry after preconcentration with 8-hydroxyquinoline or cupferron on activated-carbon. in enrichment factor of up to 100 was achieved by using both of the mentioned complexing reagents. The optimum low est pH values were found as 4.8 and 4.4 with cupferron, and 5.3 and 5.8 with oxine, for cadmium and lead, respectively, The effect of decomposition procedures, such as dry and wet ashing, on the recovery were also studied and compared. The relative standard deviations were found to be 2% for cadmium (7 mu g l(-1) Cd) and 3% for lead (70 mu g l(-1) Pb). Vegetable samples from fertilized farmland and roadside areas of Elazig, Turkey were analysed by using the proposed method.Öğe DETERMINATION OF CD, CO, CU, NI, PB AND ZN IN THE WASTE-WATERS BY ATOMIC-ABSORPTION SPECTROMETRY(Springer Verlag, 1989) GUCER, S; OZDEMIR, N[Abstract Not Available]Öğe DETERMINATION OF COBALT IN VEGETABLES BY FLAME ATOMIC-ABSORPTION SPECTROMETRY AFTER PRECONCENTRATION ON ACTIVATED CARBON(Editions Scientifiques Elsevier, 1995) YAMAN, M; GUCER, SAn activated carbon enrichment method has been developed for the determination of cobalt in vegetables by flame atomic absorption spectrometry. The samples were dry ashed at 470 degrees C and the ashes desolved with a mixture of nitric and perchloric acids. The metal was adsorbed on activated carbon by using 8-hydroxyquinoline and cupferron. The adsorbed cobalt was separated by elution with concentrated and 2 M (2 ml) nitric acid, respectively. The cobalt level in the clear solution was determined by flame atomic absorption spectrometry. The parameters such as pH, amount of complexing reagents, amount of activated carbon and stirring time were optimized for maximum recovery. It was found that the optimum pH ranges were 5.5-9.0 by using 8-hydroxyquinoline and 4.5-9.0 l(-1) by using cupferron. The relative standard deviation was found to be 2% for cobalt concentration of 40 mu g l(-1). Results for the determination of cobalt in various vegetables are given.Öğe DETERMINATION OF VANADIUM IN BIOLOGICAL MATRICES BY FLAME ATOMIC-ABSORPTION SPECTROMETRY WITH ACTIVATED CARBON ENRICHMENT(Springer Verlag, 1994) YAMAN, M; GUCER, SFor the determination of vanadium in biological materials by flame AAS an enrichment is described which comprises chelation with oxine and adsorption on activated carbon: The relative standard deviation for 10 mu g V/L was found to be 6% (n = 15).Öğe DETERMINATION OF VANADIUM IN VEGETABLE MATTER BY FLAME ATOMIC-ABSORPTION SPECTROMETRY(Royal Soc Chemistry, 1992) GUCER, S; YAMAN, MA method is described for the preconcentration of trace amounts of vanadium(v) from biological samples and its determination by flame atomic absorption spectrometry. It was found that the optimum acidity is in the pH range 2.9-4.9. An increase in the interferences from Al, Mg and Ca is observed. Elimination of these problems was achieved by adding an enrichment step to the analytical scheme. Linear calibration was obtained over the concentration range 10-120 ppb. The relative standard deviation was found to be 3% for a vanadium concentration of 100 ppb. The proposed enrichment method was applied to the determination of vanadium in foods and plants. The preconcentration system enables a 300-fold enrichment of vanadium(v) to be achieved, and therefore its determination at ppb levels. The proposed method tolerates the presence of a large number of cations that are usually found with vanadium in plant and animal tissues.Öğe INTERFERENCES IN THE DETERMINATION OF LITHIUM BY FLAME ATOMIC-EMISSION SPECTROMETRY WITH PLATINUM-LOOP ATOMIZER(Royal Soc Chemistry, 1994) OZDEMIR, Y; KARAGOZLER, AE; GUCER, SAlthough flame atomic emission spectrometry (AES) is the most popular method for the determination of Li, the method is subject to interference from alkaline and alkaline earth elements. The effects of CaOH and SrO emission bands are particularly severe. The use of a Pt-loop atomizer was found to eliminate interference from Ca and Sr, as salts of these elements remained as solid residues on the loop material. High contents of F-, Cl-, SO42- and PO43- were found to reduce the U signal, this was largely due to loss of LiCl in the case of Cl-, in the case of F-, SO42- and PO43-, the reduction in the Li signal was due to lithium oxide formation. The accuracy of the Pt-loop technique was shown to be satisfactory in matrices of high Ca and Sr contents. The detection limit obtained with the Pt-loop was at least one order of magnitude better than that of conventional AES. The technique was applied in the determination of Li in several sample types.Öğe INVESTIGATION OF CONTENTS OF SOME ELEMENTS IN SOIL AND APRICOTS BY ATOMIC-ABSORPTION SPECTROMETRY(Amer Chemical Soc, 1990) DEMIR, M; GUCER, S; ESEN, TIn this work, the relationship between the concentrations of six metals (Cd, Zn, Mn, Pd, Cu, Fe) in acetic acid extracts (2.5%) of soil and their respective concentrations in apricots grown in the same soil has been investigated. Soil extracts and apricots have been analyzed by atomic absorption spectrometry with injection or loop sample introduction. Metals were preconcenctrated with activated carbon by using ammonium pyrrolidinedithiocarbamate (APDC) as a complexing agent at pH 6.
