Carbon Black Detector,A Novel Approach to Visible Spectroscopy of Liquids Using Photoacoustic Detection

Abstract

A simple and reproducible method of recording visible spectra of solutions using photoacoustic spectrometry and carbon black as a thermal detector is introduced. Light intensity is proportionally measured by carbon black detector, a microphone system and a simple cell compartment placed after monochromator for liquid samples. Exact match with the absorption spectra is found with certain standard solutions. Aqueous solutions of Cr(III), KMnO₄, disodium fluorescein and chlorpromazine semiquinone cation radicals are tested.