For express-analysis of oils high weight components (аsphaltenes, resins, heavy isoparaffins) existing methods of analysis - near infrared spectroscopy, X-rays and mass-spectrometry are not fast enough for operative control and require sample preparation. Nuclear magnetic resonance spectra also can not give information about nanodimensional high molecular compounds and cannot be used as method of control. But optimization of technology, prevention of accidents and ambient protection require express-control of fuels and raw materials. Such opportunities posses nuclear (proton) magnetic resonance relaxometry (NMRR) method, which is demonstrated on the examples of several physic-chemical properties of oils and bitumen determination [1]. NMRR also is unique for slow motions study in aggregates, especially by spin-spin relaxation times T2i. But it was found, that determined by NMRR concentration of аsphaltenes and paraffins, differs from determined by ISO 3405-88. This can be explained by restrictions of molecular motion in nondimentional structure fragments and by shortening of relaxation times below the opportunities of NMR-relaxometer (due to dead time of probe coil). We suggested [2, 3] to «warm up» molecular motion in this fragments by irradiating samples at the wave length of their energy absorbance. This will increase amplitude of molecular motions and so selectively increase their relaxation times, which give opportunity to measure them with higher sensibility using NMR-relaxometer.

Effect of laser irradiation in visual and near infrared range of spectra on relaxation times raise DТ*2i = Т*2i - Т2i (where Т*2i and Т2i are times under and before irradiation) in natural oils is reported. Dependence of NMR-parameters from oil components concentration, affected by irradiation were studied and quantitatively interpreted in terms of energetic levels populations behavior. Correlations of DТ*2i with components concentration were revealed.

References

1. Кashaev R.S.-H. Structure-dynamical analysis by pulse method of NMR of oil disperse systems. - Kazan: GranDan, 1999. - 129 p.; Thesis of diss. doct. tech. sci. Мoscow.: Institute of combustive minerals of Russian Academy of Science. 2001. - 302 p.
2. Patent of Russian Federation claim # 2009138707/19.10.2009.
3. Кashaev R.S.-H., Gazizov E.G.. Effect of irradiation in visible and infrared spectral regions on nuclear magnetic relaxation parameters of protons in oil products // Journal of Applied Spectroscopy. - V. 77 (3). - Р. 321-328.

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The work was submitted to international scientific conference «Engineering science and modern manufacture», (France, Paris), 15-22 October, 2010, came to the editorial office on 02.09.2010.