Why pyrene using for wavelength accuracy for hplc calibration?

Pyrene is used for wavelength accuracy in HPLC calibration because it has well-defined absorbance peaks at specific wavelengths, making it a reliable tool for verifying the accuracy of the detector in an HPLC system. By comparing the detected wavelength of pyrene to its known absorbance peaks, any discrepancies can be identified and corrected to ensure precise measurement of analyte concentrations during analysis.