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lignosulphonate chelate???

Hello all,
  I found a trace mix in liquid form from Dragon Corp called Liquid
Chelated Iron.  It's makeup is Mg 0.5, B 0.02, Cu 0.25, Fe 6.00, Mn 0.25,
Zn 0.50.  That looks good enough, but the part I am unsure about is the
chelator.  It is lignosulphonate.  I did a search around the web and really
can not find much on this material.  Can someone enlighten me, please??
All the ingredients in the mix are claimed to be a compound of
lignosulphonate, like iron lignosulphonate.  The bottle says "Secondary and
Trace Nutrients derived from  magnesium lignosulphonate, copper
lignosulphonate, iron lignosulphonate, managenese lignosulphonate, zinc
lignosulphonate, and sulfuric acid.  Chelating Agent: lignosulphonate
944-800."  I picked up a bottle, 1 qt for $8US, I figured if it doesn't
work out for the tank it will for the terrestrial plants.  

Any info on lignosulphonate would be great, and of course opinions on this
mix are welcome.  

Jeff Dietsch