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