MICROWAVE-RADIATION AS A FACTOR INTENSIFYING SAMPLE PREPARATION - ANALYSIS OF SAMPLES WITH AN ORGANIC MATRIX

The use of microwave sample decomposition for determining trace compon ents in materials with an organic matrix (vegetable materials, vegetab le oil, perfumes and cosmetics, and biological fluids) was examined. T he amount of organic substances remaining in solution after decomposit ion was estimated; it was demonstrated that these substances have no e ffect on the subsequent determination of impurity metals by inductivel y coupled plasma atomic emission spectrometry and electrothermal atomi c absorption spectrometry. Conditions of microwave sample preparation (mass of the sample, composition of the acid mixture, time, and type o f system) and conditions of subsequent determination by atomic spectro metry were selected. Procedures were developed for determining major- and tracecomponents in vegetable materials (leaves, corn, and grass mi xtures), vegetable oil, biological fluids, perfumes, and cosmetics at levels of 10(-2)-10(-3)% for Al, Ba, Mn, Ti, Zn, Sr, and Fe; n x 10(-4 )% for Cu; and 10(-5)-10(6)% for Cd, CO, Cr, and Ni.