A novel direct-injection photometric detector integrated with solenoid pulse-pump flow system

► A novel flow photometric paired emitter-detector diodes (PEDD) detector is presented. ► A sample and reagent were injected by pulse micro-pumps directly into the detector. ► This method imposes the work in stop-flow conditions. ► The time of analysis depends mainly on the reaction kinetics. ► Reagents and sample dilution is reduced.