FIELD: measurement.
SUBSTANCE: use to determine content of gadolinium in polymers. Essence of the invention consists in the fact that at first calibration samples are obtained by mechanical mixing of 1.5–25.0 wt. % gadolinium oxide, 10.0–90.0 wt. % aluminium oxide and 8.5–65.0 wt. % calcium carbonate, the obtained samples are mixed with a carbon buffer containing 5.0–10.0 wt. % lithium carbonate, in a weight ratio of 1:(20–40), respectively, weighed portions are sampled, introduced into the atomic emission spectrometer spectra excitation source and spectra are obtained with exposure of 60 s and current strength of 10 A, based on the obtained spectra, plotting calibration curves in coordinates lgI – lgC, where I is the intensity of the analytical line of gadolinium at wavelength 301.013, 303.405 and 336.225 nm, and C is the weight fraction of gadolinium in percent, sample of the analysed polymer is pre-ashed in a muffle furnace at 550 °C to mineral residue, then, similarly to calibration samples, they are mixed with a carbon buffer, a weighed portion is taken, entering into atomic emission spectrometer spectra excitation source and obtaining spectrum, intensity of analytical lines of gadolinium is measured at wave lengths of 301.013, 303.405 and 336.225 nm and content of gadolinium in polymer sample is determined from calibration curves.
EFFECT: enabling reliable measurement of gadolinium content in the range of concentrations from 0_002 to 0_05 wt % in polymers.
1 cl, 3 dwg, 3 tbl
