The number of trace metallic elements of biological importance is increasing and a wide range of elements need to be analyzed in blood, urine and tissues. There is often a natural limitation of sample volume particularly in the analysis of blood and tissue digest samples. A new Mg2+Carbon paste ion selective electrode based on4,5-Bis (benzoylthio)-1,3-dithiole-2-thione (BZ2dmit) for determination of trace amount of Magnesium in Blood Serum was prepared. Using nanosilica and multi-walled carbon nanotube (MWCNT) in the composition of carbon paste electrodes causes improvement in their characterizations. The electrode composition of 3% MWCNT ,0.5% nanosilica ,25% paraffin oil, 68.5% graphite powder, 3%(BZ2dmit)..The proposed sensor shows a Nernstian response (29.9±0.7 mV decade-1) in the range of 1.0×10-9-1.0×10-2 M with a detection limit of 5.0 × 10-10 M. The response of the sensor is independent of pH in the range of 3.4 – 8.9, and its at least 28-week applicability life time, possesses the advantages of fast response time about 7s, The matched potential method (KMPM) was applied to assess the selectivity coefficients for different cations toward new prepared electrode. According to obtained results of this Mg2+nano-composite carbon paste sensor exhibited good selectivity with respect to a number of lanthanide and transition metal ions. The sensor was effectively used as an indicator electrode in the potentiometric titration of Mg (II) ions with EDTA.
Published on: Aug 25, 2016 Pages: 1-6