D. Patra et Ak. Mishra, Effect of sample geometry on synchronous fluorimetric analysis of petrol, diesel, kerosene and their mixtures at higher concentration, ANALYST, 125(8), 2000, pp. 1383-1386
A comparison of synchronous fluorescence scan (SFS) spectra of petrol, dies
el and their mixtures with kerosene in front surface, 45 degrees and 90 deg
rees angle sample geometry as obtainable from a commercial fluorimeter reve
als that 90 degrees angle sample geometry provides certain distinct charact
eristics to SFS spectra. The presence of extensive inner filter effects and
resonance energy transfer in petroleum products are the major causes of th
e distinctive characteristics of these spectra. These characteristics enabl
e the development of calibration plots for mixture samples (petrol-kerosene
and diesel-kerosene) based on the shift in lambda(SFS)(max) and SFS intens
ity. This novel method shows promise in detecting and estimating the contam
ination of petrol and diesel by kerosene. Calibration graphs obtained from
SFS intensity measurement are found to be efficacious in the whole range 0-
90% v/v of kerosene, and give a good linearity in the adulteration range ge
nerally found in the field (0-50% v/v) for petrol and diesel. The method is
simple, rapid and superior both in terms of sensitivity (0.1% v/v) and acc
uracy to other analytical methods used for petroleum product analysis.