olumns packed with chelate resin are suitable for fish sauce manufacturing factories, because unlike the batch method, both fish sauce and conditioning solution are passed through the column,and chelate resins do not require further conditioning. Thus,we evaluated the Cd removal efficiency of columns packed with the chelate resins CR11 and CR20 (Fig. 1B). Tannin-treated fish sauce contained Cd at 0.33 ± 0.01 mg/100 mL. Fig. 1B shows Cd concentrations in fractions eluted from chelate resin columns. Cd concentrations in the first fractions were 0.05 ± 0.01 mg/100 mL (CR11) and 0.04 ± 0.003 mg/100 mL (CR20), indicating effective Cd removal by both chelate resins. Whereas Cd concentrations after treatment with CR11 were constant across the first five