SIMULTANEOUS FLOW-INJECTION DETERMINATION OF AMMONIACAL NITROGEN AND CHLORIDE IN INDUSTRIAL EFFLUENT WATER WITH A COMBINED ONLINE GAS DIFFUSION DIALYSER UNIT/

An on-line gas diffusion/dialyser unit has been designed and incorpora ted into the manifold of a flow injection system for the simultaneous determination of two different species in a single sample injected int o the FIA system. A fast and reliable fully automated two-component fl ow injection procedure has been carried out where a single sample (50 mu l industrial effluent water) is injected into a carrier stream and simultaneously gas diffused and dialysed in a single on-line gas diffu sion/ dialyser unit for the determination of ammonia and chloride, res pectively. The results obtained for the ammoniacal nitrogen and chlori de in industrial effluent water compared well with data obtained by st andard methods. The relative standard deviation for industrial effluen t water samples with concentrations of ammoniacal nitrogen in the rang e between 0.050 and 1 g/l and chloride from 0.127 to 2.531 g/l have be en better than 1.0% for ammoniacal nitrogen and 0.5% for chloride, res pectively. The proposed system could be attractive for routine analyse s of industrial effluent water.