DETERMINATION OF TRACE-METAL IONS CO, CU, MO, MN, FE, TI, V IN REFERENCE RIVER WATER AND REFERENCE SEAWATER SAMPLES BY INDUCTIVELY-COUPLED PLASMA EMISSION-SPECTROMETRY COMBINED WITH THE 3RD PHASE PRECONCENTRATION

A combination of DAM-SCN- third phase extraction and inductively coupl ed plasma emission spectrometry (ICP-AES) is used for the determinatio n of trace metal ions in a river water and a seawater reference materi al. An implementation of the third phase extraction prior to ICP-AES a llows a preconcentration of trace elements (Co, Cu, Mn, Fe, V, Ti, Mn) by a factor ranging from 33 to 45. A complete separation of these ele ments is accomplished from matrices, normally affecting the excitation characteristics of ICP and suppressing the elemental signals severely . Different factors, including pH of the solutions, amounts of reagent s, matrix effects, have been investigated and optimized. Under the con ditions selected, the limits of determination have been in the range o f 0.02 to 0.6 mu g/L. The system has been successfully applied to the determination of Cu, Mn, V in the reference river water SLRS-3 and Mo in the reference seawater NASS-3. The results were in a good agreement with the certified values.