MANGANESE, COMPOUNDS & FUME (as Mn) | OSHA.gov | Occupational Safety and Health Administration

MANGANESE, COMPOUNDS & FUME (as Mn)†

Chemical Identification
CAS #	7439-96-5
Formula	Mn
Synonyms	Manganese metal: Colloidal manganese; Manganese-55 Synonyms of other compounds vary depending upon the specific manganese compound.

Physical Properties
Physical description	A lustrous, brittle, silvery solid.
Boiling point	3564°F	Molecular weight	54.9
Freezing point/melting point	2271°F	Vapor pressure	0 mmHg (approx)
Flash point		Vapor density
Specific gravity	7.20 (metal)	Ionization potential
Lower explosive limit (LEL)		Upper explosive limit (UEL)
NFPA health rating		NFPA fire rating
NFPA reactivity rating		NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs

Monitoring Methods Used by OSHA
Analyte code (IMIS no.)	1620	1620
Sampling group		METALSSG-2
Sampler/Sampling media	Tared low-ash 37 mm PVC filter, 5 microns [SLTC108]	Pre-assembled cassette with mixed cellulose ester filter (MCEF) 0.8 micron (25 or 37 mm) [MAWP025A0 or MAWP037A0]
Sampling time^*	240-480 min	240-480 min
Sampling volume (TWA)^*	960 L	480-960 L
Sampling flow rate (TWA)^*	2 L/min	2 L/min
Sampling volume (STEL/Peak/C)^*	408-960 L
Sampling flow rate (STEL/Peak/C)^*	2 L/min
Analytical method instruments	Gravimetric	ICP
Method reference	OSHA PV2121 (partially validated)	OSHA ID-125G (fully validated)
Notes	If the net weight of the sample yields a concentration below the PEL after considering the associated SAE , the SLTC will perform no further work on the sample and the sample air concentration will be reported as the calculated gravimetric air concentration. If the net weight corresponds to an amount greater than the PEL value after considering the associated SAE, the sample may be analyzed for the applicable component and appropriate results will be reported.	Results are provided for the presence and amount or concentration of a specific element or elements. The stated identity of the actual sample contents (such as a specific form or compound) is based on the assumption that the material sampled is as identified by the compliance officer using available documentation of materials and processes. The physical form of a sample (dust, mist, or fume) is identified by the compliance officer using available documentation of materials and processes. Smaller filters recommended for sampling inside welding hoods.
Special requirements	FOR TOTAL DUST SAMPLES, DO NOT USE A CYCLONE!!	For the entire suite of analytes listed in METALSSG-2, request analyte code 2587.

^* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Bulk/Wipe Method
Wipe Sampler/Sampling media
Bulk Method

On-Site Screening Techniques
Device
Model/Type
Sampling information (see manufacturer instructions)

**Exposure Limits**
OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak		NIOSH REL Up to 10-hour TWA (ST) STEL (C) Ceiling		ACGIH TLV© 8-hour TWA (ST) STEL (C) Ceiling		CAL/OSHA PEL 8-hour TWA (ST) STEL (C) Ceiling Peak
PEL-TWA		REL-TWA	1 mg/m³	TLV-TWA	0.02 mg/m³ (respirable particulate matter), 0.1 mg/m³; (inhalable particulate matter) [2012]	PEL-TWA	0.2 mg/m³
PEL-STEL		REL-STEL	3 mg/m³	TLV-STEL		PEL-STEL	3 mg/m³
PEL-C	5 mg/m³	REL-C		TLV-C		PEL-C
Skin notation	N	Skin notation	N	Skin notation	N	Skin notation	N
Notes: See 29 CFR 1910.1000 Table Z-1.		Notes:		Notes:		Notes:
Health factors: See NIH-NLM PubChem.		IDLH	500 mg/m³
Carcinogenic classifications: EPA-D, TLV-A4		Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

Additional Resources and Literature References

NOAA: CAMEO Chemicals - Manganese

NIOSH: Pocket Guide to Chemical Hazards - Manganese compounds and fume (as Mn)

Literature References

ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Manganese [7439-96-5], elemental and inorganic compounds, as Mn. See annual publication for most recent information.
EPA: Hazard Summary - Manganese
ATSDR: Toxicological Profile for Manganese. 2012.
California Occupational Safety & Health Standards Board: Initial and Final Statement of Reasons. February 3, 2001.
EPA: Integrated Risk Information System for Manganese (CASRN 7439-96-5). 1988.
Hobbesland, A., Kjuus, H. and Thelle, D.S.: Mortality from nonmalignant respiratory diseases among male workers in Norwegian ferroalloy plants. Scand. J. Work Environ. Health 23(5): 342-350, 1997.
Laohaudomchok, W. et al. Neuropsychological effects of low-level manganese exposure in welders. Neurotoxicology. 32(2): 171-179, 2011.
NIOSH: Occupational Health Guideline for Manganese. 1978.
Racette, B.A., McGee-Minnich, L, Moerlein, S.M., Mink, J.W., Videen, T.O. and Perlmutter, J.S.: Welding-related parkinsonism: clinical features, treatment, and pathophysiology. Neurology 56(1): 8-13, 2001.
Roels, H., R. Lauwerys, J.P. Buchet et al.: Epidemiological survey among workers exposed to manganese: Effects on lung, central nervous system, and some biological indices. Am. J. Ind. Med. 11: 307-327, 1987.
Roels, H.A., P. Ghyselen, J.P. Buchet, E. Ceulemans, and R.R. Lauwerys: Assessment of the permissible exposure level to manganese in workers exposed to manganese dioxide dust. Br. J. Ind. Med. 49: 25-34, 1992.
Wergeland, E. and Iversen, B.G.: Deaths from pneumonia after welding. Scand. J. Work Environ. Health 27(5): 353, 2001.

Last Updated Date : 06/14/2023

Group Sampling Information
Sampling Media	Sampling Time (If there are exceptions they will be in Notes)	TWA Sampling Volume (If there are exceptions they will be in Notes)	TWA Flow Rate (If there are exceptions they will be in Notes)
mixed cellulose ester filter (MCEF)	240-480 min	480-960 L	2 L/min

Analytes Sampling Information
Analytes	IMIS Code	Wipe Sampling	Incompatibilities
Iron*	I200	Yes, with a Ghost Wipe
Vanadium*	V125	Yes, with a Ghost Wipe
Zinc*	Z100	Yes, with a Ghost Wipe
Chromium, Metal & Insoluble salts (as Cr)**	0685	Yes, with a Ghost Wipe	Hexavalent Chromium
Cobalt, Metal, Dust & Fume (as Co)	0720	Yes, with a Ghost Wipe	Tungsten
Copper Dust & Mists (as Cu)	0730	Yes, with a Ghost Wipe
Copper Fume (as Cu)	0731	Yes, with a Ghost Wipe
Iron Oxide Fume	1520	Yes, with a Ghost Wipe
Manganese, Compounds & Fume (as Mn)***	1620	Yes, with a Ghost Wipe
Molybdenum, Dust & Insoluble compounds, (as Mo)	1790	Yes, with a Ghost Wipe
Nickel, Metal, & Insoluble compounds (as Ni)	1840	Yes, with a Ghost Wipe
Vanadium, Respirable Dust & Fume	2571	Yes, with a Ghost Wipe
Zinc Oxide Fume	2610	Contact SLTC for information

Notes

Request any or all of these analytes together. Entire group can be requested with analyte code 2587.

Results for unrequested analytes in this group will be reported if significant amount are found.

There is no need to contact SLTC before sampling.

This analysis can be pre-analyzed gravimetrically if collected on a pre-weighted PVC filter obtained from SLTC.

*These 3 codes are used for bulk sample results in place of their metal oxides.

**Please note that this is NOT hexavalent chromium.

***For Manganese STEL take only a 10-30 L sample.

MANGANESE, COMPOUNDS & FUME (as Mn)†

Chemical Identification

Physical Properties

Monitoring Methods Used by OSHA

Bulk/Wipe Method

On-Site Screening Techniques

Exposure Limits

Additional Resources and Literature References