Dissolved metals were then pre-
cipitated with APDC 1-pyrrolidine carbodithioic
acid, ammonium salt, Eastman, 0.02% wrv. at pH
2, and collected on filters 0.45 mm, Millipore.,
the efficiency precipitation of APDC varies from
91% to 100% Tisue et al., 1985.. Both types of
filters were dried at room temperature.