Determination of chloride in milk using sequential injection automated conductimetry

A new conductimetric sequential injection procedure is proposed for the aut omatic chloride determination in milk. The preparations of milk samples are time consuming procedures. The use of a sequential injection system couple d to a dialysis camera permitted easy automation and improved process contr ol over the parameters, giving high throughput analyses. In this work, a fa st and reliable automated sample addition method is described. An untreated sample of milli (142 mu l) was injected with a standard reference solution (750 mu l) in a carrier stream and dialysed for the conductimetric chlorid e determination. Potential interferences and ideal work conditions were app raised. Data acquisition and device control were achieved by computer. Resu lts were precise(r.s.d. < 1.0%) in agreement with both the official titrati on procedure and with the milk standard reference materials. The system was designed for conductimetric samples addition analysis, and no major proble ms were observed. (C) 1999 Elsevier Science Ltd. All rights reserved.