NAME: Silica, Crystalline Cristobalite, Respirable Dust
SYNONYM(s):
Cristobalite prior to 9/1/89
IMIS: 9015
CAS: 14464-46-1
DESCRIPTION:
Solid.
Exposure Limits
OSHA GENERAL INDUSTRY PEL:
see 1910.1000 (Table Z-3)
ACGIH TLV:
0.05 mg/m3 TWA; (Respirable fraction)
NIOSH REL:
0.05 mg/m3 TWA Potential Carcinogen
Health Factors
IARC:
Silica - Group 2A, probably carcinogenic to humans (Crystalline +
Silica)
HEALTH EFFECTS:
Pneumoconiosis (HE10)
Monitoring
PRIMARY SAMPLING/ANALYTICAL METHOD (SLC1):
MEDIA:
Tared Low Ash Polyvinyl Chloride (LAPVC) filter 5 microns preceded by 10 mm Nylon Cyclone
MAX V:
816 Liters MAX F:
1.7 L/min
ANL 1:
X-ray Diffraction; XRD
REF:
2 (OSHA ID-142)
CLASS:
Partially Validated
NOTE:
Collect a sample of the bulk substance and send to the lab in a separate mailing container at the time the air samples are submitted. Indicate on the sample sheet that a bulk sample has been submitted. For SiO2, a high volume area or settled dust sample is preferred. Any sample weight between 0.10 mg and 5.0 mg is acceptable (0.5 to 3.0 mg is preferred). If they are present in the work environment, the following major interferences should be noted: aluminum phosphate, feldspars (microcline orthoclase, plagioclase), graphite, iron carbide, lead sulphate, micas (biotite, muscovite), montmorillonite, potash, sillimanite, silver chloride, talc and zircon (zirconium silicate). Quartz and cristobalite may be submitted on the same filter; otherwise, submit as a separate filter.
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