2,4-DICHLOROPHENOXYACETIC ACID (2,4-D)†

Chemical Identification
Chemical Identification
CAS # 94-75-7
Formula

C₈H₆Cl₂O₃

Synonyms

2,4-D; dichlorophenoxyacetic acid; Hedonal, Trinoxol

Physical Properties
Physical Properties
Physical description White to yellow, crystalline, odorless powder.
Boiling point decomposes Molecular weight 221.04
Freezing point/melting point 280°F Vapor pressure 0.4 mmHg at 320°F
Flash point Vapor density 7.63
Specific gravity 1.57 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
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 0846 0846
Sampling group
Sampler/Sampling media OSHA versatile sampler (OVS-2) - 13 mm XAD-2 tube (270/140 mg) with GFF enclosed [SKC 226-30-16] GFF (37 mm), Type A/E [AP4003705]
Sampling time*
Sampling volume (TWA)*

12-480 L

15-200 L

Sampling flow rate (TWA)*

0.2-1 L/min

1-3 L/min

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments GC-ECD HPLC
Method reference NIOSH 5602 (OSHA modified) NIOSH 5001 (OSHA modified)
Notes
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
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
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

10 mg/m³

REL-TWA

10 mg/m³

TLV-TWA

10 mg/m³ (inhalable particulate matter) [2016]

PEL-TWA

10 mg/m³

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C 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

100 mg/m³

Carcinogenic classifications: IARC-2B, TLV-A4 Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - 2,4-Dichlorophenoxyacetic acid

NIOSH: Pocket Guide to Chemical Hazards - 2,4-D

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - 2,4-D. See annual publication for most recent information.
  • Occupational Health Guidelines for Chemical Hazards. US Department of Health and Human Services (DHHS), National Institute for Occupational Safety and Health (NIOSH) Publication No. 81-123 (1981, January). Provides a table of contents of guidelines for many hazardous chemicals. The files provide technical chemical information, including chemical and physical properties, health effects, exposure limits, and recommendations for medical monitoring, personal protective equipment (PPE), and control procedures.

Last Updated Date : 01/29/2021