MULTIELEMENT DETERMINATION OF TRACE-ELEMENTS IN COASTAL SEAWATER BY ICP-MS AND ICP-AES AFTER ALUMINUM COPRECIPITATION ASSOCIATED WITH MAGNESIUM

An analytical method for multielement determination of trace and ultra trace elements in seawater has been investigated by using ICP-MS. Trac e and ultratrace elements were preconcentrated by 10- or 20-times with addition of aluminum into seawater and then the elements were determi ned by ICP-MS. In this procedure, aluminum was added as the carrier fo r coprecipitation; it precipitated together with magnesium in seawater . Some trace elements were also measured by ICP-AES after coprecipitat ion. In addition, major and minor elements in seawater were determined by ICP-AES after dilution with acidified water. As the result, 37 ele ments in total could be determined in coastal seawater. The present re sults are compared with the concentrations of the elements in open sea water.