Yazar "Ibar, H" seçeneğine göre listele

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    A comparative study of human seminal plasma and blood serum trace elements in fertile and infertile men
    (Taylor & Francis Inc, 2002) Seren, G; Kaplan, M; Ibar, H
    Concentration of lead, cadmium, copper and zinc in seminal plasma and blood serum collected from fertile and infertile men (30 + 30) were determined by atomic absorption spectrometry (AAS). The mean blood and seminal plasma concentrations of lead, cadmium, copper and zinc-were within the normal values. The blood concentration of lead, cadmium, copper and zinc were 64.15 +/- 21.4 mug/L, 0.16 +/- 0.08 mug/L, 106.9 +/- 83.5 mug/L, 212.9 +/- 138.6 mug/L in fertile men and 65.08 +/- 21.6 mug/L, 0.30 +/- 0.15 mug/L, 203.3 +/- 129.6 mug/L and 75.5 +/- 13.3 mug/L in infertile men, respectively. The seminal plasma concentrations of these metals were 62.86 +/- 26.1 mug/L, 0.67 +/- 0.09 mug/L, 105.6 +/- 94.8 mug/L and 130.6 +/- 107.4 mug/L in fertile men and 63.14 +/- 33.4 mug/L, 0.74 +/- 0.3 mu/L, 177.7 +/- 165.3 mug/L and 83.02 +/- 28.5 mug/L in infertile men, respectively. Blank values were very low and detection limits (3sigma) were found for each analysis.
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    Determination of chromium, copper, manganese, nickel and zinc by flame atomic absorption spectrometry after separation of bentonite modified with trioctylamine
    (Scientific Publ-India, 2005) Aktas, YK; Ibar, H
    Bentonite modified with trioctylamine is developed for the separation and pre-concentration of chromium, copper, manganese, nickel,fact zinc prior to their determination by Flame Atomic Absorption Spectrometry (FAAS). The retention and recovery of the analyte elements have been investigated by applying column techniques where in Cr-III, Cu-II, Mn-II,Mn- Ni-II and Zn-II are quantitatively retained by the collector at pH 6 or above. For a column with 0.3 g of bentonite modified with trioctylamine and a flow rate of 5.0 mL min(-1), it can quantitatively adsorb the trace heavy metals and quantitative desorption of the elements can be realized by elution with 10 mL of 1 mol L-1 HNO3. Low blank values of the collector have served as important advantage and recoveries are found to be 99.9 +/- 2%, 98.8 +/- 3%, 99.6 +/- 2%, 97.2 +/- 3% and 87.3 +/- 4% for Cr, Cu, Zn, Mn and Ni, respectively, at 95% confidence level. In the presence of Na+, K+ and Mg+ the analyte elements are quantitatively separated and recovered. The relative standard deviations for the determinations are found to be 0.1-1.9%. Detection limits (3 sigma) are 1.7 mu g L-1 for Cr, 2.2 mu g L-1 for Cu, 2.1 mu g L-1 for Zn, 2.4 mu g L-1 for Mn and 2.8 mu g L-1 for Ni. The method has been applied to analysis of the Cr, Cu, Mn, Ni and Zn studied in waste waters.
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    Extraction of FeIII, SbIII and CdII from hydrochloric acid solution with organic extractant in methylisobutyl ketone
    (Scientific Publ-India, 2004) Aktas, YK; Ibar, H
    The extraction of Fe-III, Sb-III and Cd-II from hydrochloric acid solutions by neutral organophosphorus compounds (TBP#, TOPO# and HDEHP#) and high molecular weight amine (TOA(#), R3N) in MIBK# was investigated. It was found that the extraction efficiency for Fe-III is in the order : TOA = TBP > HDEHP > TOPO at low aqueous acidity and HDEHP = TOPO > TOA > TBP at higher acidity, for Shut is in the order : TOA > TOPO > HDEHP > TBP at low aqueous acidity and HDEHP > TOPO > TBP > TOA at higher acidity, and for Cd-III is in the order : TOPO = TOA > TBP > HDEHP at low aqueous acidity and TOA > TOPO > TBP > HDEHP at higher acidity. Batch method was used for the extraction of metals. The method was applied to the analysis of metals in waste water. In addition, the back-extraction for Fe, Sb and Cd were also studied. The interfering effects of Na, K, Mg, Ca, Co and Pb were investigated. Blank values were used and recoveries were 93.4, 91.0 and 96.5% for Fe, Sb and Cd, respectively, at 95% confidence level.
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    The extraction of Zh(II) and Cu(II) from hydrochloric acid solutions by trioctylamine in methyl isobutyl ketone, isoamyl acetate and diethyl ether
    (Editura Acad Romane, 2005) Aktas, YK; Ibar, H
    The extraction of Zn(II) and Cu(II) from hydrochloric acid solutions has been investigated using trioctylamine in methyl isobutyl ketone (MIBK), diethyl ether (DEE) and isoamyl acetate (IAA), As a result, it was found that the extraction efficiency for Zn(II) and Cu(II) of MIBK, DEE and IAA is in the order DEE > IAA > MIBK. The batch method was used for the extraction of Zn(H) and Cu(II). The method was applied to the analysis of the elements studied in waste water. In addition, the back extraction of elements was studied. The, influence of foreign ions on the extraction of Zn(II) and Cu(II) was investigated. Blank values were low and recoveries were 99.4% and 77.1% for Zn(II) and Cu(H), respectively, at 95% confidence level. Detection limits (3 sigma) were 2.3 mu g.L-1 for Zn and,0.0.5 mu g.L-1 for Cu(II).
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    Preconcentration of some trace elements on bentonite modified with trioctyl phosphine oxide
    (Parlar Scientific Publications (P S P), 2004) Aktas, YK; Ibar, H
    A new collector, bentonite modified by the addition of trioctyl phosphine oxide, was developed for the separation and preconcentration of chromium, zinc and copper prior to flame atomic absorption spectrometry (FAAS). The above metals are quantitatively retained on a column filled with the proposed adsorbent at pH 6.0 and completely eluted with 1 mol/L of nitric acid. An important advantage of the new collector are low blank values and recoveries were 99.4%, 98.2% and 97.6% for chromium, zinc and copper, respectively, with relative standard deviations of 1.0-5.0%. Detection limits (3sigma) were 1.3 mugL(-1) for Cr, 1.7 mugL(-1) for Zn and 2.1 mugL(-1) for Cu and elements studied can be used reliably determined in the presence of Mg+, K+ and Na+. Finally, the modified method was used for the analysis of the elements in wastewaters.
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    Sorption and preconcentration of cadmium, iron and antimony on bentonite modified with trioctylamine
    (Parlar Scientific Publications (P S P), 2005) Aktas, YK; Ibar, H
    Bentonite, loaded with trioctylamine (C24H51N, TOA), was used as pre-concentration sorbent for cadmium, iron and antimony prior to their determination by flame atomic absorption spectrometry (FAAS). The analytes were quantitatively retained on the proposed adsorbent at pH 4, and its adsorptive capacity was determined to be 13.23 mg/g, 3.33 mg/g and 10 mg/g for Cd, Fe and Sb, respectively. The metal ions could then be quantitatively eluted with I M nitric acid, and recoveries were 99.9 +/- 1%, 97.0 +/- 2 % and 92.1 +/- 3 % for Cd, Fe and Sb (95% confidence level). The relative standard deviations varied between 1.0 - 7.1%. Detection limits (3 sigma) were 0.9 mu g L-1 for Cd, 1.2 mu g L-1 for Fe and 1.4 mu g L-1 for Sb. By applying this column procedure, the elements studied can be reliably determined in the presence of Na+, K+ and Mg+. Finally, the method was applied to wastewater analysis.