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Rhodium (soluble compounds, as Rh)																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** Varies
**NIOSH REL:** 0.001 mg/m3 TWA
**Current OSHA PEL:** 0.001 mg/m3 TWA
**1989 OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 0.01 mg/m3 TWA
**Description of substance** Varies
**Original (SCP) IDLH*:** No evidence [*Note: “Effective” IDLH = 2 mg Rh/m3 — see discussion below.]
**Basis for original (SCP) IDLH:** There is no indication from experimental data or industrial experience that the soluble compounds of rhodium produce toxic effects in man. Therefore, because no evidence of an IDLH exists, respirators have been selected on the basis of the assigned protection factor afforded by each device up to 2,000  ́ the OSHA PEL of 0.001 mg Rh/m3 (i.e., 2 mg Rh/m3); only the “most protective” respirators are permitted for use in concentrations exceeding 2 mg Rh/m3.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA:**
**Animal or human data:** None relevant for use in determining the revised IDLH.

**Revised IDLH:** 2 mg Rh/m3 **Basis for revised IDLH:** The available toxicological data contain no evidence that an acute exposure to a high concentration of soluble rhodium compounds would impede escape or cause any irreversible health effects within 30 minutes. However, the revised IDLH for soluble rhodium compounds is 2 mg Rh/m3 based on being 2,000 times the NIOSH REL and OSHA PEL of 0.001 mg Rh/m3 (2,000 is an assigned protection factor for respirators and was used during the Standards Completion Program for deciding when the "most protective" respirators should be used for soluble rhodium compounds).

			
							
								Page last reviewed:  December 4, 2014						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Publications & Products
Immediately Dangerous To Life or Health (IDLH) Values
Table of IDLH Values
Criteria for Determining IDLH Values
Historical Documentation
Original (SCP) Values
Abbreviations for IDLH Documentation
Abbreviations for Journal Titles Follow NIOSH Facebook
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