PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Rhodium 7440-16-6
11.01
11.00
16.01
Formula Synonyms
Rh
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
102.91 S 1966 3727 12.41
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
3.0 33 200
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
0.71 7.8 48
Technical Basis
A review of available sources identified IDLH (1990) and TWA (PEL, REL, TLV) exposure limits for metal, fume, and insoluble compounds (as Rh). Data sources were selected according to the hierarchy listed in Table 3.1. The IDLH (1990) (200 mg/m3) for insoluble rhodium metal and fumes was evaluated as the TEEL-3 basis, however it was not selected because the IDLH had no evidence and was based on a lower priority exposure limit, a PEL-TWA (0.1 mg/m3) x 2000. Instead, the TLV-TWA was selected as the TEEL-1 basis. TEEL-2 and TEEL-3 values were derived according to Table 3.5. This approach resulted in IDLH (1990) = TEEL-1 derived TEEL-3 (200 mg/m3).
• TEEL-1 = TLV-TWA (1 mg/m3) x 3
• TEEL-2 = TEEL-1 x 11
• TEEL-3 = TEEL-2 x 6
This review generated TEEL values that are consistent with Rev. 29A.
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Rhodium.
Exposure limits, TLV-TWA: https://www.osha.gov/chemicaldata/515
IDLH: https://www.cdc.gov/niosh/idlh/7440166.html
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.