COMPARISON OF DIFFERENT SOLID-PHASE EXTRACTION MATERIALS AND TECHNIQUES BY APPLICATION OF MULTIRESIDUE METHODS FOR THE DETERMINATION OF PESTICIDES IN WATER BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY (HPLC)

Solid phase extraction materials and techniques (C-18 EMPORE(R) disks, polystyrenedivinylbenzene (SDB) EMPORE(R) disks, C-18 BondElut cartri dges and ENVI-Carb cartridges) are compared for the preconcentration o f 33 basic/neutral and 10 acidic/phenolic pesticides and three metabol ites in water. The efficiency of the different extraction procedures w as investigated by application of appropriate multiresidue separation methods by reversed phase-high performance liquid chromatography with UV-diode-array detection. Calibrations were performed with multicompon ent standard mixtures and recoveries, relative standard deviations and determination limits were calculated for comparing the described enri chment methods. Experiences made in practical application of the diffe rent techniques and materials were also considered for the final evalu ation.