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