Silicon dioxide determination in the air of operation zone

The test method specifies silicon dioxide content determination by X-Ray fluorescence method in the air of operation zone. The test method describes only analysis procedure of filters.
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Silicon dioxide concentration is determined in the dust precipitated on filters that can keep solid particles of definite air volume pumped through the filter.
Sampling is run by pumping of 0.6m3 at air discharge of 0.02 m3/min.

The obtained sample filter is fixed in the filter holder. If the filter is large then it is cut in parts in transverse directions and the parts are analyzed separately. The filter holder is placed in spectrometer and analysis is run automatically according to the chosen program.
The filter shall be measured in 4 transverse positions. Arithmetic average of the four measurement results after subtraction of the blank sample is taken as the final result for each element. Blank sample is the result of 3-5 measurements of the clean filters of the same lot of filters used for sampling.

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