2.2.3. Enrichment of organic pollutant in water samples
Preparation of enrichment column: Resin - methanol mixture was filled into the glass column with
diameter of 2 cm and glass wool at the bottom of the column. After methanol flowed out of the column
and resin phase reached 12cm, the column was washed by pure water for several times. The filling
process of column requires uniform and bubble-free.After enrichment column was prepared, water
sample which was adjusted to pH< 2 was pumped into the column with the flow rate of 30 mL/min.