The effects of amino acids on Cd removal by chelate resins were examined using aqueous amino acid solutions as model samples.Amino acids concentrations were adjusted to 0, 2000, 4000,6000, 8000, and 10,000 mg of alanine, glutamic acid, and lysine at a ratio of 3:2:2 in 100 mL. These are the three major amino acids in fish sauce, and their concentration in reference samples was prepared according to that found in fish sauce (7460 mg/100 mL). As with NaCl samples, Cd concentrations were adjusted to 2.0 mg/100 mL, and pH was adjusted to 6 using 0.1-M sodium phosphate buffer. Samples (20 mL) were then mixed with CR11 (70 mg) or CR20 (70 mg) and were shaken for 24 h. Cd concentrations were
analysed using ICP–AES. Results are presented as the mean of three independent measurements.