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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: 2223

Chemical Abstracts Service (CAS) Registry Number: 7440-16-6

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VI9355000

Chemical Description and Physical Properties:

gray fume or dust
molecular weight: 103
vapor pressure: approx. 0 mm
boiling point: 4532°F
melting point: 3570°C

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 0.1 mg/m3

Construction Industry: 0.1 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 1 mg/m3 TWA; Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 0.1 mg/m3 TWA

Health Factors

Health Effects: Low risk health effects (HE19)

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: Mixed Cellulose Ester Filter (MCEF) 0.8 microns
    maximum volume: 960 Liters
    minimum volume: 480 Liters
    maximum flow rate: 2.0 L/min
    current analytical method: Atomic Absorption Spectroscopy; AAS/GF
    method reference: 2 (OSHA In-House File)
    sampling and analytical error: 0.202
    method classification: Partially Validated
    note: Sodium Bisulfite Fusion. Submit as a separate sample. If the filter is not overloaded, samples may be collected up to an 8-hour period. Analytical method does not distinguish between dust and fume. Rhodium and Platinum soluble salts may also be collected on same filter.

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