A quantitative spectrophotometric procedure for iron based on a solid phase extraction using bathophenanthroline in a po

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A quantitative spectrophotometric procedure for iron based on a
solid phase extraction using bathophenanthroline in a poly(vinyl
chloride) membrane is described. In the absence of Fe2+ the
membrane is colorless, but when immersed in a solution of Fe2+ and
I, the membrane develops a red color as a result of the formation
of an Fe2+_ bathophenanthroline complex. A calibration curve
determined using a set of external standards with known
concentrations of Fe²+ standardization relationship of gave a
A=(8.60×10 M )×[Fe]
What is the concentration of iron, in ppm, for a sample with an
absorbance of 0.100.