A deep red pigment (C34H32N4O4Fe) which contains reduced (ferrous) iron.
Heme is found in red blood cells (hemoglobin). It is also found outside the body in the nonprotein portions of some organic molecules called hemoproteins. In water quality treatment, it may be referred to as heme iron, which is organically-bound iron that can cause water to have a pinkish cast to it.
See Also: Iron (Fe) Dissolved Organic Carbon Tannin Total Organic Carbon (TOC) Crenothrix Polyspora Gallionella Ferruginea Organic Iron Iron (Fe) Tannin