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Rhodium (metal fume and insoluble compounds, as Rh)																				Related Pages
										May 1994
Immediately Dangerous to Life or Health Concentrations (IDLH)
**CAS number:** 7440–16–6 (Metal)
**NIOSH REL:** 0.1 mg/m3 TWA
**Current OSHA PEL:** 0.1 mg/m3 TWA
**OSHA PEL:** Same as current PEL
**1993-1994 ACGIH TLV:** 1 mg/m3 TWA
**Description of substance:** Varies
**Original (SCP) IDLH*:** No Evidence [*Note: “Effective” IDLH = 200 mg Rh/m3 — see discussion below.]
**Basis for original (SCP) IDLH:** Because no evidence of an IDLH for rhodium (metal fume and insoluble compounds) is available, respirators have been selected on the basis of the assigned protection factor afforded by each device up to 2,000  ́ the OSHA PEL of 0.1 mg Rh/m3 (i.e., 200 mg Rh/m3); only the “most protective” respirators are permitted for use in concentrations exceeding 200 mg Rh/m3.
**Short-term exposure guidelines:** None developed
**ACUTE TOXICITY DATA:**
**Lethal dose data:**

**Species**
    **Reference**
    **Route**
    **LD50** **(mg/kg)**
    **LDLo** **(mg/kg)**
    **Adjusted LD**
    **Derived value**Rat RhCl3
    Johnson 1981
    oral
    >500
    -----
    >1,778 mg Rh/m3
    >179 mg Rh/m3Rat RhCl3
    Veselov 1977
    oral
    1,302
    -----
    4,638 mg Rh/m3
    464 mg Rh/m3Rat Na3RhCl6
    Johnson 1981
    oral
    >500
    -----
    >936 mg Rh/m3
    >94 mg Rh/m3Rat [Rh(NH3)5Cl ] Cl2
    Johnson 1981
    oral
    >500
    -----
    >1,223 mg Rh/m3
    >122 mg Rh/m3**Human data:** None relevant for use in determining the revised IDLH.
 
 **Revised IDLH:** 100 mg Rh/m3**Basis for revised IDLH:** No inhalation toxicity data are available on which to base an IDLH for insoluble rhodium compounds. Therefore, the revised IDLH for insoluble rhodium compounds is 100 mg Rh/m3 based on acute oral toxicity data in animals [Johnson 1981; Veselov 1977]. This may be a conservative value due to the lack of relevant acute toxicity data for workers.**REFERENCES:**
1. Johnson, Matthey and Co., Ltd. [1981]. Biological effects of rhodium metal and compounds. Material Safety Report N5 81-48. [From ACGIH [1985]. Rhodium and compounds. In: Documentation of the threshold limit values and biological exposure indices. 5th ed. Cincinnati, OH: American Conference of Governmental Industrial Hygienists, p. 512.]
2. Veselov VG [1977]. Comparative toxicity of platinoids in conditions of acute oral intoxication of animals. Gig Tr Prof Zabol *21*(7):55-57 (in Russian).

			
							
								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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