Recently, the flow-batch analyzer was miniaturized (μFBA) and applied to determine Fe(II) in iron-based supplements (oral solutions) using the 1,10-phenanthroline method . Micro-flow-batch analyzer (μFBA) was also used for the determination of phosphorus in biodiesel, employing the molybdenum blue method . The microfabrication used deep ultraviolet lithography and photopolymerizable urethane-acrylate photoresist. It contained an integrated photometer based light emitting diode (LED) and phototransistor for detection, and a nylon wire homogenizing system.