English Abstract The effect of various experimental and instrumental
parameters on the quantitative analysis of mineral oil components by means
of infrared (IR) spectrometry has been investigated. Standard NEN-methods
6675 en 5733 have been used as starting point. Experiments have been
carried out in parallel on a dispersive and a Fourier-Transform infrared
spectrometer and results have been compared. The influence of the solvents
carbontetrachloride, 1,1,2-trichlorotrifluoroethane (freon-113) and
tetrachloroethene on the linearity, reproducability and detection limits
have been determined. Factors affecting the analysis appear to be solvent,
evaporation effects, pipet-type, cell-type, cell position, instrument-type
and optical resolution. Detection limits in freon-113 and
carbontetrachloride on the Fourier-Transform instrument are found to be
about 0.2 mug/l ; a factor of 3 better than on the dispersive machine.
Tetrachloroethene was found to be less suited as a solvent. Recommendations
are made to improve the present standard procedures.
