Ion Chromatography (IC)
Description of method
Ion chromatography is an anlytical method for ionic species. It uses the property of ions to be differently strongly bound to polar solid adsorbents, depending on species and size. The adsorbents are either ion exchangers of low capacity (HPIC = high-performance ion chromatography), totally sulphonated cation exchangers of high capacity (HPICE = high-performance ion chromatography exclusion) or neutral resins provided with a mobile separation phase (MPIC = mobile-phase ion chromatography). The test solution is passed across the chromatographic column at pressure. Depending on the exchanger, anions, cations or ion pairs can thus be adsorbed. For the elution of the ions different electrolytes are used and the retention times of the individual ions are determined by their affinity for the stationary phase. A suppressor reduces the high background conductivity of the eluent. Ion detection takes place via conductivity, light absorption or amperometry.
Features of IC
- Rapid simultaneous multi-ion determination in aqueous solutions
.Solid samples, which are insoluble in aqueous solutions can be analysed after extraction or combustion.