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