DETERMINATION OF TRACE-ELEMENTS IN SEAWATER BY FLUORINATED METAL ALKOXIDE GLASS-IMMOBILIZED 8-HYDROXYQUINOLINE CONCENTRATION AND HIGH-RESOLUTION INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY DETECTION

8-hydroxyquinoline immobilized on fluorinated metal alkoxide glass (MA F-8HQ) was prepared under metal-free conditions and used for the separ ation of trace elements from seawater matrix. Trace elements in 250 mi of seawater were collected with a MAF-8HQ column (bed volume, 0.85 mi , total exchange capacity, 5.2 mg for Cu (II)), eluted with 25 mi of 0 .5 M nitric acid and determined by the high-resolution inductively cou pled plasma mass spectrometry (HR-ICP-MS). This procedure allowed the determination of V, Co, Ni, Ga, Y, Mo, Cd, Ce, Pr, Nd. Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, W and U, of which the concentrations ranged o ver six orders (10 mu g-0.01 ng l(-1)). The precision was less than 10 %. The detection limit of most elements depended not on the performanc e of HR-ICP-MS but on the level of contamination. (C) 1998 Elsevier Sc ience B.V.