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    INTERFERENCES IN THE DETERMINATION OF LITHIUM BY FLAME ATOMIC-EMISSION SPECTROMETRY WITH PLATINUM-LOOP ATOMIZER
    (Royal Soc Chemistry, 1994) OZDEMIR, Y; KARAGOZLER, AE; GUCER, S
    Although 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.
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    PREPARATION AND OPTIMIZATION OF CONDUCTING POLYMER (POLYPYRROLE) AS A GLUCOSE SENSOR
    (Tubitak Scientific & Technological Research Council Turkey, 1995) EKINCI, E; OZDEN, M; KARAGOZLER, AA; TURKDEMIR, HM; KARAGOZLER, AE
    An amperometric enzyme electrode for glucose determination was prepared by anodic polymerization of pyrrole and concomitant incorporation of glucose oxidase on Pt substrates in A KCl solution at a potential of 0.8 V vs. Ag/AgCl. The amperometric response to glucose was measured at a potential of 0.7 V in order to oxidize the hydrogen peroxide generated. Effects of various parameters (e.g., film thickness, concentrations of monomer, supporting electrolyte, and enzyme) on the electrode preparation and the effects of buffer concentration, temperature, and pH, on the chronoamperometric response of the prepared enzyme electrode were systematically investigated and the optimum values for each parameter were determined. If was found that a biosensor, with a response time of less than 5 s, can be easily prepared in ca. 5 min. Activation energy of the enzymatic reaction was calculated as 13 kJ/mol and the linearity of the enzyme electrode response ranged from 2.0 to 15 mM of glucose. The specificity of the enzyme electrode was tested for ascorbic, succinic and maleic acids, and sucrose, and no discernible signal was detected above the background current. Moreover, the response of the electrode was found to be stable for about one month.