Aq. suspensions (2 g/L) of waste alfalfa (A) and goldenrod (G) biomass were sep. mixed for 2-120 min at 20 degrees C with Cu, Zn and Mn sulfate solns. and then filtered. Initial and final ion concns. were detd. by inductively coupled plasma optical emission spectrometry and the resp. enrichment coeffs. were calcd. They were 3705, 332 and 188 for biomass A and 2014, 254 and 47 for biomass G, resp.