Extraction is effected by equilibrating homoionically saturated ion exchange resin beads with {HEAD ~ a sample} of {TAIL ~ the complex matrix} under study 
of
Extraction is effected by equilibrating homoionically saturated ion exchange resin beads with { HEAD ~ a sample } of { TAIL ~ the complex matrix } under study
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH