Application Colorimetric reagent for iron, which is more sensitive than other reagents (e.g. Ferrozine), molar absorptivity 35500 liters/mol cm. Synonyms 2-Furansulfonic acid, 5,5'-[3-(2-pyridinyl)-1,2,4-triazine-5,6-diyl]bis-, sodium salt (1:2); 3-(2-pyridyl)-5,6-bis(5-sulfo-2-furyl)-1,2,4-triazine disodium salt; 5,5'-(3-(2-Pyridinyl)-1,2,4-triazine-5,6-diyl)bis-2-furansulfonic acid disodium salt; 5,5'(3-(2-Pyridyl)-1,2,4-triazine-5,6-diyl)-bis-2-furansulphonic acid disodium salt; 5,5'-[3-(Pyridin-2-yl)-1,2,4-triazine-5,6-diyl]difurane-2-sulfonate de disodium; Dinatrium-5,5'-[3-(pyridin-2-yl)-1,2,4-triazin-5,6-diyl]difuran-2-sulfonat; Disodium 5,5'-[3-(2-pyridinyl)-1,2,4-triazine-5,6-diyl]di(2-furansulfonate); Disodium 5,5'-[3-(pyridin-2-yl)-1,2,4-triazine-5,6-diyl]difuran-2-sulfonate; 2-Furansulfonic acid, 5,5'-(3-(2-pyridinyl)-1,2,4-triazine-5,6-diyl)bis-, disodium salt; 3-(2-Pyridyl)-5,6-bis(2-(5-furylsulfonic acid))-1,2,4-triazinedisodiumsalt; 3-(2-Pyridyl)-5,6-bis(2-(5-furylsulfonicacid))-1,2,4-triazinedisodiumsalt; 3-(2-Pyridyl)-5,6-di(2-furyl)-1,2,4-triazine-5′,5′′-disulfonic acid disodium