PRODUCT Properties
| Melting point: | 337°C |
| Density | 1.25 |
| vapor pressure | 0Pa at 25℃ |
| refractive index | 1.6800 (estimate) |
| storage temp. | -20°C |
| solubility | DMSO (Slightly), Water (Slightly) |
| form | Crystals |
| color | Pale yellow |
| Water Solubility | Soluble. 70 g/100 mL |
| Exposure limits | TLV-TWA 0.5 mg/m3 (ACGIH and MSHA). |
| Stability: | Hygroscopic |
| LogP | -4.6 at 20℃ |
Description and Uses
Diquat (DQ) is a bipyridyl herbicide that has been in use since the 1950s. It is employed as a general use herbicide that is fast acting and nonselective. Additionally, on average, 90% of DQ consumption is reported in North America, Europe, Australia, and Japan.
DQ is used in a manner similar to paraquat. It is found predominantly as a mixture with paraquat, sold as Weedol and Pathclear. The most widely used formulation of DQ alone, Reglone, is an aqueous solution containing 200 g l-1 DQ dibromide. Besides the use as a general weed control agent on noncrop land, DQ is used as a preharvest desiccant on crops such as cotton, flax, and alfalfa. Additionally, almost one-third of all DQ sold is used to control emergent and subemergent aquatic weeds.
Safety
| Symbol(GHS) |    GHS08,GHS09,GHS06 |
| Signal word | Danger |
| Hazard statements | H319-H335-H410-H315-H302-H372-H317-H330 |
| Precautionary statements | P261-P272-P280-P302+P352-P333+P313-P321-P363-P501-P260-P271-P284-P304+P340-P310-P320-P403+P233-P405-P501-P273-P391-P501-P260-P264-P270-P314-P501-P264-P280-P302+P352-P321-P332+P313-P362-P264-P280-P305+P351+P338-P337+P313P-P264-P270-P301+P312-P330-P501 |
| Hazard Codes | T |
| Risk Statements | 21-25 |
| Safety Statements | 36/37-45 |
| RIDADR | UN 2781/2811 |
| OEB | C |
| OEL | TWA: 0.5 mg/m3 |
| HazardClass | 6.1(a) |
| PackingGroup | II |
| Toxicity | LC50 (96-hour) for rainbow trout 21 mg/L, mirror carp 67 mg/L (Worthing and Hance, 1991), fathead minnow 14 mg/L, largemouth bass 7.8 mg/L (Surber and Pickering, 1962), bluegill sun?sh 35 mg/L, walleye 2.1 mg/L (Gilderhus, 1967) and striped bass 0.25 ppm (Wellborn, 1969); LC50 (96-hour) for northern pike 16 mg/L, rainbow trout 11.2 mg/L (Gilderhus, 1967); acute oral LD50 for rats is 230 mg/kg (Ashton and Monaco, 1991), 120 mg/kg (RTECS, 1985). |
