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Iron test - how it works ?

Need some help from the chemical savvy...
When we use any aquatic Fe test kit and got a reading, say, 0.1ppm Fe.
What does it really measured ?
(1) Does it breakdown all the available Fe chemical bound (include all
available FeEDTA from the trace mix dosage.) and indicate the total Fe++
available ?
(2) Or it just measured the existing free Fe++ in the water ? while the
FeEDTA are very much untouched ?
(3) Or does it indicate all Fe (whether Fe++ or Fe+++?)
(Hope my question - as an outsider to the wonderful world of chemistry, make
any sense.)


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