METHOD FOR QUANTITATIVE DETERMINATION OF GROUP OF FLUORESCENT AND ION INDICATORS IN FORMATION WATER AT THEIR JOINT PRESENCE Russian patent published in 2016 - IPC G01J3/00 

FIELD: oil and gas industry.

SUBSTANCE: invention can be for quantitative determination in formation waters of fluorescent and ion indicators in combined presence thereof. Method for quantitative determination of sodium fluorescein, rhodamine C, thiourea, carbamide and ammonium rhodanide in formation waters comprises separating analysed sample of formation water from oil. Removing mechanical impurities and clarifying by filtration through a hydrophilic membrane filter. Further, for deposition of fluorescent dyes on sorbent, sample of formation water is passed through water-repelling silica gel with grafted alkyl groups, and eluate is divided into portions. Corresponding reagents are added and measurements are taken at wavelengths characteristic for analysed indicators. For quantitative determination of sodium fluorescein and rhodamine C using a luminescent technique, method includes desorption thereof from sorbent with acidified methanol, addition of a borate buffer with pH 9.18 and measurements are made based on a calibration curve plotted in advance.

EFFECT: simple analysis, improvement of its analytical properties, as well as faster analysis.

1 cl, 3 tbl