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|Title:||Determination of Nanomolar Level of Guanine by Differential – Pluse Adsorptive Cathodic Stripping Voltammetry of its Copper (II) complex|
|Authors:||r. m. shubietah|
ali z. abu zuhri
a. g. fogg
|Publisher:||Fresenius' Journal of Analytical Chemistry|
|Abstract:||Guanine is determined at the 5.0×10^?10 ?2.0×10^?7 mol/l level by differential-pulse adsorptive stripping voltammetry at a hanging mercury drop electrode using the reduction peak of its copper (II) complex at ?0.21 V vs. Ag-AgCl electrode. The optimum analytical conditions were found to be Britton-Robinson buffer solution (pH 4.8), an accumulation potential of 0.0 V and an accumulation time of 3 min. Under these conditions, the detection limit is 5.0×10^?10 mol/l and the relative standard deviation 2.6% for 1.0×10^?7 mol/l guanine. The method is compared with the previous voltammetric methods. The presence of some purine derivatives does not interfere.|
|Appears in Collections:||Faculty & Staff Scientific Research publications|
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