Automated dilution in flow injection analysis with double on-line dialysis. A system for the determination of chloride in industrial effluents and plating bath solutions

Summary An automated on-line system for the determination of chloride in industrial effluents and plating bath solutions based on the concept of flow injection analysis is described. Samples with a very high chloride content up to 6 g/100 ml (60 g/l) are analysed by using an automated in-manifold double on-line dialysis technique. The sampling rate is 100 samples per hour. The method is suitable for the analysis of chloride with a relative standard deviation of better than 0.8%. The measurement is based on the red-coloured iron thiocyanate complex.