Spectrofluorimetry of lubricating oils: determination of oil mist in air

Abstract

The fluorescence emission and excitation spectra of a variety of lubricating oils have been investigated. All samples showed an intense fluorescence in the ultra-violet region, and this was made the basis of a sensitive method for the determination of oil mist in air. Less than 1 pg of oil mist per litre of air can be determined.* Presented a t the meeting of the Society on Wednesday, November 4th, 1959.

Oil Mist Hazard and Piped Air Supplies

“…An investigation to find the extent of this oil contamination was started. In view of the extremely small quantities of oil mist likely to be present in the air, it was decided to use a fluorimetric technique for oil estimation (Parker and Barnes, 1960). …”

New approach to phase and modulation resolved spectra

“…The total intensity, S(\,t), of the fluorescence emission obtained by a sinusoidally modulated excitation is given as the sum of the intensity components of the individual species, each with its characteristic phase angle, <¿>¡, and relative modulation, M¡. Thus S(\,t) = /,•( )/;( ) sin ( -<£¡) (1) where /¡( ) describes the unit intensity contribution of the ¿th species as a function of the wavelength and /¿( ) the contribution of the ¿th species to the total intensity relative to the other contributing species. By definition, = 1.…”

Characterization of crude and residual-type oils by fluorescence spectroscopy

“…This fluorescence results from the radiations of many organic compounds, the major ones being the polyaromatic and heterocyclic compounds (Riecker, 1962). Parker and Barnes (1960) used the intensity of the fluorescent spectrum for determining oil mist in air collected from filter traps of an air compressor. Riecker (1962) used changes in the fluorescent wavelength to trace the extent of migration of crude oil in oil fields.…”