Transcription of Crystalline Silica - Quartz and Cristobalite
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Crystalline Silica - Quartz and Cristobalite
Crystalline Silica Quartz and Cristobalite Method number: ID-142. Version: 3. Target concentration: 50 g/m (for Quartz and Cristobalite ). 3. OSHA PEL: 50 g/m (combined polymorphs). 3. 25 g/m action level 3. ACGIH TLV: mg/m (respirable fraction). ( - Quartz and Cristobalite ). Procedure: Samples are collected by drawing workplace air through pre-weighed 5- m pore size, 37-mm diameter low ash polyvinyl chloride (PVC) filters preceded by 10-mm nylon Dorr Oliver cyclones. The weight of the respirable dust is determined by gravimetric analysis. The PVC filters are dissolved and the samples are suspended in tetrahydrofuran (THF). The samples are then deposited on silver membranes and analyzed by X-ray diffraction (XRD). Recommended sampling time and sampling rate: 480 min at L/min (816 L).
S103 silica (quartz, total) CAS number: 14808-60-7 boiling point: 2477 °C (4490 °F) melting range: 1705 °C (3101 °F) density: 2.6 calculated ...
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