accuracy and precision. The limits of quantification varied from 0.1 to
1 lg/kg depending on the analyte and matrix. The average extraction and clean-up recoveries in different
matrices were between 45 (only for ergometrine in biscuit) and 90%. The uncertainty associated with the
analytical method was not higher than 51% and 30%, at concentration levels of 2.5 and 150 lg/kg respectively