2.4. Water-soluble inorganic ions
The details for the ion chromatography procedure are described elsewhere (Tan et al.,2009).
Briefly, ultrasonic agitation was used to extract inorganic ions from samples, where the filter aliquot (9 cm2) was submerged in a vial with 15 ml ultra pure water, sealed and subjected to ultrasound for 20 min for extraction. The extract was then analyzed by ion chromatography (Dionex 1400) to determine the concentrations of the inorganic ions.
Water-soluble inorganic ions