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![2-(5-Bromo-2-pyridylazo)-5-[N-propyl-N-(3-sulfopropyl)amino]phenol disodium salt dihydrate for spectrophotometric det. of Zn(II), Cu(II), Fe(II), Co(II), H₂O₂, ≥95.0% (HPLC)](https://api.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/images/977/888/0d08ee28-b317-474b-b369-cb1437b893e9/640/0d08ee28-b317-474b-b369-cb1437b893e9.jpg)