Iron (Fe) standard solution at 10,000 µg/mL in 2.0 mol/L nitric acid (HNO3). This is a certified reference material used primarily in analytical chemistry laboratories for calibration and quality control in instrumental methods such as Inductively Coupled Plasma Mass Spectrometry (ICP-MS), Atomic Absorption Spectroscopy (AAS), and other trace metal analysis techniques. It enables accurate quantification of iron concentrations in environmental samples (e.g., water, soil), food products, biological materials, and industrial effluents. The acidic matrix ensures stability and compatibility with common analytical protocols. Not intended for direct agricultural or water treatment applications due to the strong acid content.