FerroZine® Iron Reagent, 25 g

[3-(2-Pyridyl)-5,6-bis(4-phenylsulfonic acid)-1,2,4-triazine, monosodium salt, monohydrate] CAS No. 69898-45-9. One of the most sensitive iron reagents known N4C20H13S2O6Na·...H2O, FW = 510.47. Assay: >95%