2,4-Dichlorophenoxyacetic acid
- 2,4-D
2,4-Dichlorophenoxyacetic acid | |
| |
| Formula | Cl2C6H3OCH2COOH |
| Structure | |
| Description | White to yellow, crystalline powder, odorless when pure, may have a slight phenolic odor due to impurities. |
| Uses | It is registered in the USA as a herbicide for control of broadleaf plants & as a plant-growth regulator. |
| Registry Numbers and Inventories. | |
| CAS | 94-75-7 |
| EC (EINECS/ELINCS) | 202-361-1 |
| EC Index Number | 607-039-00-8 |
| EC Class | Harmful; Irritant; Sensitising; Dangerous for the Environment |
| EC Risk Phrase | R 22 37 41 43 52/53 |
| EC Safety Phrase | S 24/25 26 36/37/39 46 61 |
| RTECS | AG6825000 |
| RTECS class | Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector; Human Data; Primary Irritant |
| UN (DOT) | 2765 |
| Merck | 13,2825 |
| Beilstein/Gmelin | 1214242 |
| Beilstein Reference | 4-06-00-00908 |
| RCRA | U240 |
| EPA OPP | 30001 |
| Swiss Giftliste 1 | G-1469 |
| Canada DSL/NDSL | DSL |
| US TSCA | Listed |
| Austrailia AICS | Listed |
| New Zealand | Listed |
| Japan ENCS (MITI) | Listed |
| Properties. | |
| Formula | C8H6Cl2O3 |
| Formula mass | 221.04 |
| Melting point, °C | 137 - 139 |
| Boiling point, °C | 346 |
| Vapor pressure, mmHg | 2E-5 (25 C) |
| Vapor density (air=1) | 7.63 |
| Saturation Concentration | 526 ppm (0.05%) at 160 C (calculated) |
| Density | 1.563 g/cm3 (20 C) |
| Solubility in water | Very soluble |
| Surface tension | 66.5 g/s2 at 25 C and ph 1.4 |
| pKa/pKb | 2.98 (pKa) |
| Partition coefficient, pKow | 2.81 |
| Heat of fusion | 13.7 kJ/mol |
| Heat of vaporization | 62.2 kJ/mol |
| Heat of combustion | -3915 kJ/mol |
| Hazards and Protection. | |
| Storage | Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances. |
| Handling | Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Keep container tightly closed. Avoid ingestion and inhalation. Use with adequate ventilation. Wash clothing before reuse. |
| Protection | Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure. |
| Respirators | A respiratory protection program that meets OSHA's 29 CFR 1910.134 and ANSI Z88.2 requirements or European Standard EN 149 must be followed whenever workplace conditions warrant a respirator's use. |
| Small spills/leaks | Clean up spills immediately, using the appropriate protective equipment. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Provide ventilation. |
| Stability | Stable at room temperature in closed containers under normal storage and handling conditions. |
| Incompatibilities | Strong oxidizing agents, strong acids, strong bases. |
| Decomposition | Hydrogen chloride, carbon monoxide, irritating and toxic fumes and gases, carbon dioxide. |
| Fire. | ||||
| Flash Point,°C | 163 | |||
| Fire fighting | Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Combustible material; may burn but does not ignite readily. To extinguish fire use water spray, dry chemical, carbon dioxide, or appropriate foam. | |||
| Fire potential | Nonflammable. | |||
| Hazards | Containers may explode when heated. | |||
| Combustion products | Toxic and irritating hydrogen chloride or phosgene gases may form. | |||
| NFPA | Health | 2 | ||
| Flammability | 0 | |||
| Reactivity | 0 | |||
| Health. | |
| Exposure limit(s) | TLV: ppm; 10 mg/m3 (as TWA) (ACGIH 1993-1994). OSHA PEL: TWA 10 mg/m3 NIOSH REL: TWA 10 mg/m3 NIOSH IDLH: 100 mg/m3 |
| Carcinogin | I-2B |
| Poison_Class | 3 |
| Exposure effects | May cause liver and kidney damage. Effects may be delayed. |
| Ingestion | Harmful if swallowed. May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause liver and kidney damage. Human fatalities have been reported from acute poisoning. |
| Inhalation | Causes respiratory tract irritation. May cause liver and kidney damage. Can produce delayed pulmonary edema. |
| Skin | Causes skin irritation. May be harmful if absorbed through the skin. |
| Eyes | Causes eye irritation. May cause chemical conjunctivitis. |
First aid |
|
| Ingestion | Never give anything by mouth to an unconscious person. Get medical aid. Do NOT induce vomiting. If conscious and alert, rinse mouth and drink 2-4 cupfuls of milk or water. |
| Inhalation | Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid. DO NOT use mouth-to-mouth respiration. |
| Skin | Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. |
| Eyes | Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid. |
| Transport. | ||
| UN number | 2765 | |
| Response guide | 152 | |
| Hazard class | 3.2 | |
| Packing Group | III | |
| USCG CHRIS Code | DCA | |
| HS Code | 2918 90 90 | |