| http://www.w3.org/ns/prov#value | - Preferred chelating agents are often aminopolycarboxylic acids or salts thereof such as EDTA, HEDTA, or DTPA, and/or carboxylic acid substituted N-containing heterocyclics, such as picolinic or dipicolinic acid, 8-hydroxyquinoline, and organopolyphosphonates, including 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP), and alkyleneaminomethylene phosphonic acids such as ethylene diamino tetra-methy
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