IN-LINE PRECONCENTRATION OF PLATINUM WITH AN ALUMINA MICRO-COLUMN IN AN FIA-ICP SYSTEM

This investigation was aimed at the preconcentration of trace quantiti es of platinum with an alumina micro-column incorporated in a flow inj ection system. An inductively coupled plasma atomic emission spectrome ter was used as detector. The, advantages of the in-line preconcentrat ion system was maximized by optimizing parameters such as the acidity of the sample, the concentrations of the carrier and eluent streams an d the flow rates of the individual streams. With this system it was po ssible to increase the platinum detection limit of the inductively cou pled plasma atomic emission spectrometer by two orders of magnitude, w hich corresponded to an enrichment factor of 25.5. Furthermore the pre cision of the system was better than 5% RSD at the 0.72 mg l(-1)level.