A Comparison of Chromatographic Methods for Determination of s-Triazines in Milk

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Abstract
Both the selectivity and the sensitivity of several chromatographic methods used for a determination of s-triazine residues in milk have been evaluated. Employing GLC-NPD the detection limit for all analytes was as low as 0.2μg/kg. Acceptable separation of s-triazines was achieved on wide-bore HP-20 M capillary column. Due to the high selectivity of the mass fragmentography technique even less polar stationary phase could be employed for analysis of milk extracts. The detection limit of GLC-MS was comparable to that achieved by GLC-NPD. Additional clean-up step had to be included prior to HPLC-UV determination. Good resolution of s-triazines was accomplished on reverse phase octadecyl-bonded column, nevertheless, the sensitivity was lower one order of magnitude in this case.