IMMOBILIZATION OF 8-HYDROXYQUINOLINE ONTO SILICONE TUBING FOR THE DETERMINATION OF TRACE-ELEMENTS IN SEAWATER USING FLOW-INJECTION ICP-MS

A rapid and simple on-line method is described for the preconcentratio n of Mn, Co, Ni, Cu, Zn, Cd and Pb from sea water using 8-hydroxyquino line immobilized onto silicone tubing (Sil-8-HQ) via the Mannich react ion. Recoveries between 35 and 95% and limits of detection in the ppt range were obtained using a 2 m long Sil-8-HQ tube with a sample flow rate of 1.0 mi min(-1). A tube could be subjected to sample loading an d elution cycles over 200 times. The capacity was 1.5 and 1.3 mu g cm( -2) for Cu and Mn, respectively. Cu, Cd, Co, Pb, Mn, Zn and Ni were de termined in coastal and open ocean seawater using flow injection induc tively coupled plasma mass spectrometry (FI-ICP-MS). Good agreement wi th certified values for the certified reference materials NASS-4 and C ASS-3 was demonstrated when quantitation was undertaken by the method of additions. (C) 1998 Elsevier Science B.V. All rights reserved.