Ion exchange chromatography, (IC) often just ion chromatography, is an analytical method in chemistry and biology. With the help of this chromatographic method, substances can be separated on the basis of their charge. A polymeric matrix contains charged functional groups that have reversibly bound counterions (cations in the case of cation exchangers and anions in the case of anion exchangers).

source https://de.wikipedia.org/wiki/Ionenaustauschchromatographie

ICP/MS (Inductively Coupled Plasma - Mass Spectrometry) is a robust, very sensitive analytical method in inorganic elemental analysis. It is used, among other things, for the trace analysis of heavy metals such as mercury, lead or cadmium. In ICP/MS, ionised argon is first induced by a high-frequency current and the sample is heated to 5000-10000°C. The atoms are then ionised and the ionisation process continues. This ionises the atoms and creates a plasma. Subsequently, the ions generated in the plasma are accelerated towards the analyser of the mass spectrometer. There, the individual elements and their isotopes are measured. With ICP/MS, detection limits in the range of ng/l or sub ng/l are achieved for most elements of the periodic table. Furthermore, the method is characterised by an extremely high linear range over up to nine orders of magnitude (g/l - pg/l) in the quantitative determination.  

source https://www.chemie.de/lexikon/ICP-MS.html