Yes, xylem does contain iron.
Iron, specifically Fe(III), is transported within the xylem. It's believed to be complexed with citrate to facilitate its movement. This complexing helps to keep the iron soluble and prevents it from precipitating out of the solution as it travels from the roots to other parts of the plant, such as the leaves. While iron uptake mechanisms by root cells are well-studied, the process by which leaf cells acquire iron from the xylem is less understood.
