Detoxification of 1,2-dichloroethane was carried out using hydrolyzed amino acids recycled from the waste of slaughterhouses. An analogue EDTA was obtained from the reaction between one of above products and chloroacetic acid. An analog of NTA was synthesized from the reaction between amino acid and chloro-acetic acid. Both analogues of EDTA and NTA are useful as an chelating agent for stabilizing heavy metals.