MULTIELEMENT DETERMINATIONS IN-GROUND WATER ULTRAFILTRATES USING INDUCTIVELY-COUPLED PLASMA-MASS SPECTROMETRY AND MONOSTANDARD NEUTRON-ACTIVATION ANALYSIS

Twelve ultrafiltrates of two ground waters rich in humic substances (u p to 97.8 mg C L(-1)) and in salinity (up to: cations 44.3 meg L(-1), anions 44.9 meg L(-1)) were investigated with ICP-MS and with NAA in p arallel. With both techniques 22 elements were analysed in a wide conc entration range (mg/L to ng/L). Ultrafiltration at pore sizes from 100 0 nm down to 1 nm lowers the humic colloid content as well as the conc entration of the colloid-borne polyvalent cations. Carbon interference s were studied in detail using artificially prepared model waters. The detection limits of ICP-MS in the ultrafiltrates (0.01 mu g/L-10 mu g /L) and in pure analyte solutions (5 ng/L-600 ng/L) are compared with those of NAA for pure water analysis (0.004 ng/L-50 ng/L).