Benzo[k]fluoranthene solution is primarily used in environmental and analytical chemistry as a reference standard for the detection and quantification of polycyclic aromatic hydrocarbons (PAHs) in various samples. It is instrumental in monitoring air, water, and soil quality to assess pollution levels and ensure compliance with environmental regulations. Additionally, it serves as a critical tool in research studies focusing on the toxicological effects of PAHs, helping to understand their impact on human health and ecosystems. The solution is also employed in the calibration of analytical instruments, such as gas chromatography-mass spectrometry (GC-MS), to ensure accurate and reliable measurements.