METHOD OF DETERMINING CONCENTRATION OF VANADIUM IN ATMOSPHERIC AIR BY INDUCTIVELY COUPLED PLASMA MASS SPECTROMETRY (VERSIONS)

摘要

FIELD: chemistry. ^ SUBSTANCE: invention relates to a method of determining concentration of vanadium in atmospheric air by inductively coupled plasma mass spectrometry (versions). One of the versions is characterised by that atmospheric air samples are collected by drawing the analysed air through an analytical aerosol filter at a rate of 50 l/min for 20 minutes and air temperature and atmospheric pressure at the sampling time are recorded. After sampling, the filter is decomposed by microwave sample preparation, where the filter is placed into a fluoroplastic cup and an internal standard solution of erbium or terbium in deionised water with concentration of 1 mg/dm3 and concentrated nitric acid are successively added. The sample is then mineralised according to the program to the microwave sample preparation system. The obtained mineralised product is transferred to a polypropylene test tube. The fluoroplastic cup is washed from the sample 2-3 times by adding 1 ml of deionised water each time, shaking and transferring each wash-off into said test tube. The volume of the sample is then increased to 10 ml by adding deionised water. The contents are stirred and the obtained sample is diluted with deionised water in volume ratio 1:9 respectively. The sample is placed into the test tube of the sampling device of an inductively coupled plasma mass spectrometer and measurements are taken. Concentration of vanadium in air is determined using a calibrated curve by bringing volume air collected for analysis to normal conditions. ^ EFFECT: use of the present invention increases sensitivity and selectivity while providing a wider range of detecting vanadium from 0,000005 mg/m3 to 0,02 mg/m3. ^ 6 cl, 6 tbl