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