Abstract
Multi-reverse flow injection analysis (Mr-FIA) integrated with multi-optical sensor was developed and optimized for the simultaneous determination of multi ions; Mn(II), Fe(II), Cu(II) and Fe(III) in water samples. The sample/standard solutions were propelled making use of a four channels peristaltic pump whereas 4 colorimetric reagents specific for the metal ions were separately injected in sample streams using multi-syringe pump. The color zones that formed in the individual mixing coils were then streamed into multi-channels spectrometer, which comprised of four flows through cell and four pairs of light emitting diode and photodiode, whereby signals were measured concurrently. The linearity range (along with detection limit, µgL−1) was 0.050–3.0(16), 0.30–2.0 (11), 0.050–1.0(12) and 0.10–1.0(50)mgL−1, for Mn(II), Fe(II), Cu(II) and Fe(III), respectively. In the interim, the correlation coefficients were 0.9924–0.9942. The percentages relative standard deviation was less than 3. The proposed system was applied successfully to determine targeted metal ions simultaneously in natural water with high sample throughput and low reagent consumption, thus it satisfies the criteria of Green Analytical Chemistry (GAC) and its goals.
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•A novel multi-reverse flow injection analysis (Mr-FIA) was invented for monitoring multi-ions.•A low cost and simple design optical sensor enables simultaneous detection was reported.•Its application was to determine Mn(II), Fe(II), Cu(II) and Fe(III) in natural water.•The prototype is a suitable multi-parameter system for green analytical chemistry applications.