| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: invention relates to analytical chemistry, namely, to method of preparing samples for detecting elements and their isotopes in hydrocarbon, mineral and synthetic, in particular, vacuum oils, oil products and fuels and lubricants. Method of preparing samples for detecting content of uranium isotopes in oils by method of weight-spectrometry with inductively-connected plasma includes selection of oil samples and their decomposition with concentrated acid at high temperatures and pressure. Sample decomposition is carried out till full transparency according to multi-step programme in microwave oven by means of nitric acid in amount not less than 5 cm3 per each sample with weight from 0.4 g to 0.6 g. High frequency radiation power is maximum, pressure within autoclave being within the range from 500 to 1200 kPa, with exposure time on sample from 5 to 15 min at each decomposition stage. ^ EFFECT: ensuring full decomposition of hydrocarbon oils samples to state of transparency, reduction of sample decomposition time and lowering limits of detecting uranium isotopes in hydrocarbon oils samples. ^ 1 dwg, 1 ex, 3 tbl |
