Printed circuit boards (2 kg) were recovered from waste mobile telephones (9.3 kg), disintegrated and grinded into 2 grain fractions up to 1.25 mm (vibration mill, 8 samples) and up to 1.00 mm (hammer mill, 8 samples). The representative samples of both fractions were analyzed for Cu and Ni contents by at. absorption spectroscopy. The results were assessed by box plot method to remove the deviated data. The Cu content was higher in the samples with smaller grains than that with coarser grains (18.14% and 13.71%, resp.) but the Ni content was higher in the samples with coarser grains than. that with smaller grains (1.76% and 2.44%, resp.). A procedure for prepn. of a representative sample of the waste used for chem. anal. was proposed.