3, A chelating agent which forms an easily water-soluble metal chelated compound such as nitrilotriacetate (NTA) or ethylene diamine tetraacetate (EDTA) is incorporated in a detergent composition.

在洗衣粉中，例如次氮基三乙酸酯（NTA）者是乙二胺四乙酸酯（EDTA），这些易于形成水溶性的金属物。