Product Description
2,4-Dichlorophenoxyacetic Acid is supplied as white crystalline solids. It has a melting point of 138°C and a boiling point of 160°C (53 Pa). The product is soluble in organic solvents such as ethanol, acetone, ether, and benzene, but is insoluble in water. The oral LD₅₀ in rats is 375 mg/kg.
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) |
| Fp | 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 | 142796 |
| 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. |
| LogP | 2.81 |
| CAS DataBase Reference | 94-75-7(CAS DataBase Reference) |
| NIST Chemistry Reference | (2,4-Dichlorophenoxy)acetic acid(94-75-7) |
| IARC | 2B (Vol. 113) 2018 |
| EPA Substance Registry System | 2,4-D (94-75-7) |
| 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 |
| 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 |
Product Application
2,4-Dichlorophenoxyacetic Acid is widely used as a herbicide and plant growth regulator. It also serves as a reference standard for the determination of carbon and hydrogen in organic microanalysis.
In addition, it can be used as a preservative and may be combined with other disinfectants. It has also been reported to provide limited control of stem rot in citrus fruits.
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