From: poutnik4nntp@gmail.com   
      
   Dne 16/06/2016 v 06:48 Poutnik napsal(a):   
      
   > Oxalate need free calcium to make precipitate of calcium oxalate.   
   >   
   > Chelated calcium form is somewhat less efficient, as free calcium   
   > concentration is lowered by equilibrium with the chelate. There is a   
   > competition of the chelate and oxalate over the free calcium. Important   
   > is the relative strength of chelate and oxalate calcium binding.   
   >   
   P.S.: OTOH, stability of calcium chelates usually weakens in acidic   
   environment faster than ability of oxalate to react with calcium,   
   as oxalic acid is one of strongest organic acids.   
      
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   Poutnik ( The Pilgrim, Der Wanderer )   
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