{HEAD ~ Lithium zirconate}, an alkali metal oxide, and an alkali earth metal oxide is used as {TAIL ~ an absorbing/separating agent} 
is used as
{ HEAD ~ Lithium zirconate } , an alkali metal oxide , and an alkali earth metal oxide is used as { TAIL ~ an absorbing / separating agent }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL