CMK-3 (25 mg) was packed in a glass SPE minicolumn (50 mm×10 mm i.d.). The column were conditioned with methanol (10 mL) and 5 mL of deionized water. The sample solutions (25 mL) spiked with 100 ng mL−1 of diazinon were adjusted to suitable pH, and then, passed through the SPE column at a constant flow rate. A peristaltic pump was used to adjust the flow rate of eluent and sample solution. The pH of the solution (4-6) was adjusted with HCl or NaOH solution. Next, the retained diazinon was eluted from CMK-3 with 2-6 mL acetonitrile or methanol. Finaly, the concentration of diazinon in the eluate solution was determined by
