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.

在洗衣粉中掺入螯，如次氮基三乙酸（NTA）者是乙二胺四乙酸（EDTA），螯易于形成水溶性的金属螯物。