Physical Properties
Molecular weight:364.9. Physical form:Colourless crystals. Density:1.2 (20 °C); Melting point:111-112 °C; Vapour pressure:0.25 mPa (20 °C); Partition coefficient(n-octanol and water):logP = 6.37 (23? °C, distilled water); Solubility:In water 0.012 mg/l (24 °C). In acetone 460, ethanol 57, hexane 10, benzene 110, xylene 390, cyclohexane 320, n-octanol 63 (all in g/l, 20 °C). Stability:Stable at 50 °C for 90 d; unstable to light. Stable to hydrolysis for 30 d in the dark ( pH 5, 7 and 9, 25 °C). Soluble in methylene chloride, relatively soluble in acetonitrile and ethanol.
Toxicology
Oral:Acute oral
LD
50
for male rats 1350, female rats 820, male mice 424, female mice 383 mg/kg. Percutaneous:Acute percutaneous
LD
50
for rats and rabbits >2000
mg/kg. Non-irritant to eyes and skin (rabbits). Non-sensitising to skin (guinea pigs). Inhalation:
LC
50
for male rats 0.66, female rats 0.62
mg/l air.
Environmental Profile
Ecotoxicology:
Algae:Does not significantly affect the average specific growth rate of
Selenastrum capricornutum.Bees:
LD
50(oral) 0.55 μg/bee.Birds:Acute oral
LD
50
for bobwhite quail >2250, mallard ducks >2500 mg/kg.Daphnia:EC
50
(48 h) 0.59 μg/l (nominal concentration).Fish:50 (96 h) for rainbow trout 1.1-3.1, bluegill sunfish 1.8-3.3 μg/l; (48 h) for carp 8.3 μg/l.Worms:
LC
50
(14 d) 38 mg/kg soil.
Environmental fate:
Animals:In the rat, goat and hen, an orally administered dose is excreted mainly in the faeces. Metabolism is complex, with at least 30 degradates.Soil:Readily degrades microbiologically in aerobic soils,
DT
50
<21 d; further degrades to polar products (including soil-bound residues) and CO
2. In natural water,
DT
50
10 d (25 °C, in dark).
WATER SOLUBILITY: 1.2 x 10
-6
g/100 ml at 20°C.
Transport Information
Signal Word:CAUTION; Hazard Class:III (Slightly hazardous)