High Purity Ethylenediaminetetraacetic Acid Solution (or EDTA XL) is an aqueous solution of the tetrasodium salt of ethylenediaminetetraacetic acid. It works as a chelating agent with multivalent metal ions forming a 1:1 molar ratio. EDTA XL is completely miscible in water. One gram of NorthQuest EDTA XL is equivalent to the chelation capacity of 1.0 mmole of EDTA 39%. NorthQuest EDTA XL is manufactured to meet high-purity needs and is NTA and glycolate free.