Analysis of sulphuric acid aerosols by laser-induced breakdown spectrometry and laser-induced photofragmentation
Laser induced breakdown spectrometry and laser photofragmentation spectrometry are investigated as potential approaches to the detection and quantification of the sulphuric acid aerosols resulting from the oxidation of dimethylsulphide in air. The former, direct technique, where aerosols are introduced in the plasma formed by focusing the fundamental frequency of a Nd:YAG laser in air, and atomic sulphur emission is measured in the region of 180 nm, gives a limit of detection of 165 ppbv for a 15 minutees integration time, which is inadequate for our purposes. The second, indirect approach, based on the photofragmentation, with 193 nm photons, of the compound resulting from interaction between sodium chloride and sulphuric acid aerosols, gives a detection limit of 48 ppbv in 10 seconds measuring time. With this method, a complete "titration curve" for sulphuric acid aerosols can be obtained in "quasi" real-time.
Bibliographic Reference: Article:Applied Spectrometry, further details unavailable
Availability: Applied Spectrometry (Journal)
Record Number: 200012154 / Last updated on: 2000-08-10
Original language: en
Available languages: en