WET DIGESTION USING MICROWAVE IRRADIATION FOR MINERALIZATION OF ORGANIC-SAMPLES BEFORE HEAVY-METAL DETERMINATION BY DIFFERENTIAL-PULSE ANODIC-STRIPPING VOLTAMMETRY .1. PLANT-MATERIAL

A wet mineralization method using microwave irradiation as energy sour ce was applied for decomposition of organic samples. To establish opti mum conditions for mineralization procedure, different parameters such as mass, the nature of the sample, amounts and ratios of used acids, time and power of microwave irradiation were tested. The international standard reference materials (citrus leaves, apple leaves, P-alfalfa- lucerne, cabbage leaves) were mineralized under the established condit ions. Differential pulse anodic stripping voltammetry (DPASV) was used for determination of Zn, Cd, Pb and Cu. A novel important feature of the method was the placing of quartz crucible (with sample and acids) inside Teflon vessel.