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2,4-Dichlorophenoxyacetic acid Structure

2,4-Dichlorophenoxyacetic acid

Chemical Properties

Melting point 136-140 °C (lit.)
Boiling point 160 °C (0.4 mmHg)
Density  1.563
vapor pressure  0.4 mm Hg ( 160 °C)
refractive index  1.5000 (estimate)
Flash point 160°C/0.4mm
storage temp.  2-8°C
solubility  Soluble in organic solvents (ethanol, acetone, dioxane)
pka pK1:2.64 (25°C)
form  crystalline
color  off-white to tan
PH Range Acidic
Odor Threshold 3.13 ppm
Water Solubility  Slightly soluble. Decomposes. 0.0890 g/100 mL
Merck  14,2796
BRN  1214242
Henry's Law Constant 6.72 and 0.84 x 10-5 atm?m3/mol were reported at pH values of 1 and 7, respectively (wetted-wall column, Rice et al., 1997a)
Exposure limits NIOSH REL: TWA 10 mg/m3, IDLH 100 mg/m3; OSHA PEL: TWA 10 mg/m3; ACGIH TLV: TWA 10 mg/m3.
Stability Stable, but moisture-sensitive and may be light-sensitive. Incompatible with strong oxidizing agents, corrodes many metals. Decomposes in water.
EPA Primary Drinking Water Standard MCL:0.07,MCLG:0.07
LogP 2.810
CAS DataBase Reference 94-75-7(CAS DataBase Reference)
EWG's Food Scores 11-10
FDA UNII 2577AQ9262
IARC 2B (Vol. 113) 2018
NIST Chemistry Reference (2,4-Dichlorophenoxy)acetic acid(94-75-7)
Pesticides Freedom of Information Act (FOIA) 2,4-D
EPA Substance Registry System 2,4-D (94-75-7)

Safety

Symbol(GHS) GHS hazard pictogramsGHS hazard pictogramsGHS hazard pictograms
Signal wordDanger
Hazard statements H302-H317-H318-H335-H410
Precautionary statements P261-P273-P280-P301+P312-P302+P352-P305+P351+P338
Hazard Codes  Xn,Xi,T,F
Risk Statements  22-37-41-43-52/53-39/23/24/25-23/24/25-36/37/38-11-36-20/21/22-67-66
Safety Statements  24/25-26-36/37/39-46-61-2-45-36/37-27-16-7-9
RIDADR  UN 3077 9/PG 3
OEB B
OEL TWA: 10 mg/m3
WGK Germany  2
RTECS  AG6825000
Autoignition Temperature > 180 °C
TSCA  Yes
HazardClass  6.1
PackingGroup  III
HS Code  29189090
Hazardous Substances Data 94-75-7(Hazardous Substances Data)
Toxicity LD50 (oral): rat [free] 375 mg/kg, [-Na] 666-805 mg/kg.
IDLA 100 mg/m3
NFPA 704:
0
2 0

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2,4-Dichlorophenoxyacetic acid Chemical Properties,Usage,Production

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