IODINE†

Chemical Identification
Chemical Identification
CAS # 7553-56-2
Formula

I₂

Synonyms

iodine crystals; molecular iodine

Physical Properties
Physical Properties
Physical description Violet-black crystals with metallic luster and a sharp, characteristic odor.
Boiling point 365°F Molecular weight 253.8
Freezing point/melting point 236°F Vapor pressure 0.3 mmHg at 77°F
Flash point Vapor density
Specific gravity 4.93 Ionization potential 9.31 eV
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
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 1515
Sampling group
Sampler/Sampling media sampling glass tubes packed with 100 mg IABC front and 50 mg backup sections [SKC 226-80 or equivalent]
Sampling time*

5 min

Sampling volume (TWA)*

2-5 L

Sampling flow rate (TWA)*

0.5 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments ISE
Method reference OSHA ID-212 (fully validated)
Notes

Humidity at the sampling site needs to be assessed prior to the actual sampling. FOR OSHA CSHOs ONLY: If it is anticipated to be greater then 50%, please contact the SLTC for further instructions. Submit as separate sample. When the analysis of this compound is requested, analysis for Iodide is performed and reported as Iodine.

Special requirements

* 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.

Wipe Method
Wipe Method
Sampler/Sampling media

OSHA STAFF CONTACT SLTC FOR MEDIA

Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device Detector tube Detector tube
Model/Type Gastec 9L Gastec 80
Sampling information
(see manufacturer instructions)
1-2 strokes, 0.04-12 ppm range, uncertainty 16% for 0.2-1.2 ppm, 8% for 1.2-12 ppm 1-4 strokes, approx 0.3-48 ppm range, uncertainty 16%
Exposure Limits
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 TLV-TWA

0.01 ppm (inhalable fraction and vapor) [2007]

PEL-TWA
PEL-STEL REL-STEL TLV-STEL

0.1 ppm (vapor fraction) [2007]

PEL-STEL
PEL-C

0.1 ppm (1 mg/m³)

REL-C

0.1 ppm (1 mg/m³)

TLV-C PEL-C

0.1 ppm (1 mg/m³)

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

2 ppm

Carcinogenic classifications: TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:

0.1 ppm/0.5 ppm/5 ppm

Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Iodine

NIOSH: Pocket Guide to Chemical Hazards - Iodine

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Iodine and Iodides. See annual publication for most recent information.
  • International Chemical Safety Cards (WHO/IPCS/ILO): Iodine.
  • Backer, H. and Hallowell, J.: Use of iodine for water disinfection: iodine toxicity and maximum recommended dose. Environ. Health Perspect. 108(8): 679-684, 2000.
  • Pohanish, R.P. (editor): Iodine. In, Sittig's Handbook of Toxic and Hazardous Chemicals and Carcinogens, Fourth Ed., Vol. 2. Norwich, NY: Noyes Publications, William Andrew Publishing, 2002, pp. 1305-1306.

Last Updated Date : 01/29/2021