A method using weak anion exchange cartridge for solid phase extraction before high performance liquid chromatography-negative electronspray ionization-tandem mass spectrometry [WAXSPE+HPLC-ESI(-)-MS/MS] detection has been developed to measure C2-C14 perfluorocarboxylates(PFCAs) in sewages.

When weak basic anion exchange resin is applied in water treatment,its main performance index operating exchange capacity is mainly affected by the residual ion exchange capacity in exhausted bed.

Removal of chromate(Ⅵ) from drinking water by weak base anion exchange resins;