NIOSH 7601 (Issue 3)

SILICA, CRYSTALLINE, by VIS

This method uses visible absorption spectrophotometry to monitor silicon complexes-silicomolybdate (420 nm) and molybdenum blue (820 nm). Determination of crystalline silica in respirable or total dust, settled dust and in biological samples. This is P&CAM 106 in a revised format. Use personal protective equipment to prevent contact of acids with the skin. HF dissolves glass. Use plastic labware for all solutions containing HF. Concentrated acids are corrosive. Note that this method is listed by CDC as being "historical" and has been revised. This revision is not available at the time of publication.

Analysis Type (Application Method): Visible Absorption Spectrometry

Link to NIOSH 7601 (Issue 3) Method

Compatible Filters:

37 mm 0.8 μm MCE or 37 mm 5.0 μm PVC supported with backup pad in a two-piece, 37 mm cassette filter holder (preferably, conductive) held together by tape or cellulose shrink band. Forceps to handle filter membrane.

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