FIELD: chemistry.
SUBSTANCE: described are versions of a method and apparatus for conducting such evaluation when determining the final degree of purity or final degree of contamination of fluid during sampling thereof. The described apparatus and method involve measuring the refraction index of the fluid over a certain period of time, curve fitting using refraction index measurement results or data values derived therefrom and calculating the final refraction index or final data value based on the fitted curve in order to calculate the final degree of contamination or purity of the fluid.
EFFECT: high information content and reliability of evaluation.
25 cl, 6 dwg
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