Nitrobenzene solution standard is primarily used in analytical chemistry as a reference material for calibration and quality control purposes. It is employed in gas chromatography (GC) and high-performance liquid chromatography (HPLC) to ensure accurate measurement and identification of nitrobenzene in various samples. This solution is also utilized in environmental testing to detect and quantify nitrobenzene contamination in water, soil, and air. Additionally, it serves as a standard in research laboratories for studying chemical reactions and synthesis processes involving nitrobenzene. Its precise concentration and purity make it a reliable tool for validating analytical methods and ensuring consistency in experimental results.