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Of Iron, chelators, and test kits --- REPOSTING


This is a repost of an earlier message which I was hoping to here
a few responses from but none came.  It contains a subject I think
is of importance to many so I am hoping someone can share their

I have just got off the phone with Seachem technical support and been
informed that the Iron supplied in their Flourish line of products is non-
chelated, that it is ferrous  gluconate, and that this makes it better than
many other iron supplements which are chelated.

I was then reminded of the many posts on the APD which indicate that
neither the Lamotte or Hatch test kits test for chelated iron. Yet most of
us get measurable numbers from these test kits.

Could one of more chemically inclined APDers remove some of the
confusion surrounding the statements the test kit manufacturers are
making versus the results which we obtain in practice?  I have read that
it is possible the test kits can still be accurate, that the measurements
we get are as a result of the iron comming unchelated.

But if the iron did become unchelated, it raises the question, how fast and
how completly was it unchelated by the time we test it? (did it measure all

Additional questions regards iron I have:
  1)  in measurements I have made using Dupla drops in a
       bucket of tap water, the iron levels remain stable
       over the period of a period of a week.  This seems to
       contradict what I have read that iron is unstable. Any
2)   Does anyone know if the Dupla products are
       chelated and by which chelate?
3)   Is there really any benefit to non-chelated iron
       versus chelated ferrous iron?

Christopher Coleman
christopher.coleman at worldnet_att.net