Method for measuring content of radioactive elements thorium and uranium in coal gangue
A radioactive element and measurement method technology, applied in the field of thorium and uranium element determination, can solve the problems of inability to measure multiple elements, matrix interference, cumbersome operation, etc., achieve accurate and reliable test results, promote oxidation and decomposition, and reduce dosage
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[0046] A method for determining the content of radioactive elements thorium and uranium in coal gangue by microwave digestion-inductively coupled plasma mass spectrometry, comprising the following steps:
[0047] (1) Pass the gangue sample through a 0.090mm sieve in advance, and dry it at 105°C for 2 hours. After cooling, weigh 0.2g coal gangue sample into a microwave digestion tank, add a small amount of water to moisten it, add 5mL concentrated nitric acid (ρ=1.42g / mL), 3mL concentrated hydrofluoric acid (ρ=1.15g / mL), 1mL concentrated hydrogen peroxide (mass fraction 30%), digested according to a preset microwave digestion program;
[0048]The microwave digestion program is: using a power of 900W, the first temperature rise, from room temperature to 150°C within 10 minutes, and stay for 10 minutes; the second temperature rise, from 150°C to 210°C within 15 minutes, and stay for 20 minutes;
[0049] (2) Cool to room temperature after digestion, rinse the inner wall of the di...
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