Investigation of laser-induced fluorescence spectra of different grades of petroleum products dissolved in sea water with double-frequency excitation by pulses of femtosecond length

The time dynamics of the laser-induced fluorescence spectra of various grades of petroleum products dissolved in seawater was studied for two-frequency excitation at wavelengths of 266 and 400 nm with pulses of duration about 100 fs. The minimum detection limits for concentrations of MFO fuel oil samples and TCM gas engine fuel were determined. The conducted studies showed that the method used has good sensitivity and can be used to analyze traces of hydrocarbons in seawater, both anthropogenic and natural origin.