ELECTROCHEMICAL INVESTIGATION OF HEAVY METALS IN HONEY IN SOME REGIONS OF KOSOVO

To investigate heavy metals (Cu, Pb, Cd, Zn) in honey as a method of investigation we have used Differential Pulse Polarography. Samples have been collected in some regions of Kosova, polluted considered areas but also some places from unpolluted zones as a reference of comparison with the first ones. Based on the literature data regarding the method we’ve used, wave polarographic potentials show presence of heavy metals in their own potentials whereof : Ecu2+ = 86 mv, E Pb2+ = -313 mv, ECd2+= -503mv, and in our experimental conditions it was little hard to detect the presence of Zn, sometimes due to hydrogen wave interference. From obtained polarograms we have constructed calibration plot for each metal where from we conclude the quantity of metals in analyzed samples. Measurements were conducted in a pure electrolyte HNO3 at same conditions as in honey samples for metal concentrations from: 1*10-7mol/dm3 ? 1*10-6mol/dm3 while we followed potential from 0,25 - 0,8 V. Values of the current intensity expressed in nA show no high values but the presence of heavy metals in analyzed samples is very clear.