Prior to exposure, the sorbent contains {HEAD ~ one or more sorbates} that will desorb during {TAIL ~ exposure} 
desorb during
Prior to exposure , the sorbent contains { HEAD ~ one or more sorbates } that will desorb during { TAIL ~ exposure }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL