Abstract
The preconcentration by evaporation to dryness and the coprecipitation with Fe (OH) 3 and PbS were applied to activation analysis of river water samples taken from the Tonegawa river, the main source of tap water supply to Tokyo district. The following 24 elements could be determined: Al, Ca, Dy, Mg, Ti, V (by short period irradiation), Ag, As, Co, Cr, Cs, Cu, Eu, Fe, La, Lu, Na, Rb, Sb, Sc, Se, Sm, W and Zn (by long period irradiation) . The concentration of these elements is considered to be in naturally occurring levels in subsurface water. This pretreatment method proved to be applicable satisfactorily for the instrumental neutron activation analysis of trace elements in river water sample.
