{HEAD ~ The preferred practice} of the Collins method is to use {TAIL ~ a mole ratio} of complexing agent to Zr that is similar to the mole ratio of organic base to Zr 
is to use
{ HEAD ~ The preferred practice } of the Collins method is to use { TAIL ~ a mole ratio } of complexing agent to Zr that is similar to the mole ratio of organic base to Zr
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH