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Chemical Sampling Information (CSI)
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General Description

OSHA IMIS Code Number: S050

Chemical Abstracts Service (CAS) Registry Number: 7631-90-5

Exposure Limits

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 5 mg/m3 TWA; Appendix A4 (Not Classifiable as a Human Carcinogen)

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 5 mg/m3 TWA

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
    method reference: 2 (OSHA ID-121)
    method classification: Partially Validated
    note: Submit as a separate sample. An analysis is performed for total Na and reported as the compound.

Wipe Sampling Method:

  • sampling media: Whatman smear tab
    analytical solvent: Deionized water

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