A micro flow analysis (lFA) system has been designed and fabricated for determination of total iron. The
system consists of a microchannels fabricated by etching the polymethyl methacrylate (PMMA) by using
laser ablation techniques and a sealed polydimethylsiloxane (PDMS) as top plate. The PMMA micro-flow
was topped with a home-made polydimethylsiloxane (PDMS) micro-flow through cell, which was integrated with light emitting diode (LED) as light source and a USB 2000 spectrometer as detector. The proposedlFA system was applied to determination of Fe(III) using norfloxacin as a less-toxic complexing
agent in an acetate buffer solution pH 4.0, resulting in a yellow colored complex which gave the maximum absorption at 430 nm. Under the optimum conditions, a linear calibration graph was obtained in
the concentration range of 0.20–5.00 mg L
1
. The limit of detection (LOD, defined as 3r) and limit of
quantification (LOQ, defined as 10r) were 0.12 and 0.45 mg L
1
, respectively. The relative standard deviation (R.S.D.) for repeatability and reproducibility were less than 1.50% and 1.24% (n= 11) for 0.2 mg L
1
and 1.0 mg L
1
Fe(III), respectively. The proposed method was successfully applied to the determination
of total iron in water samples, validated by the FAAS standard method after digestion by HNO3and H2O2