Methidathion manufacturers and suppliers

Methidathion suppliers

Properties

Melting point:: 39-40°C

Boiling point:: 347.7±52.0 °C(Predicted)

Density: 1.51 g/cm3

vapor pressure: 2.5×10^-4 Pa (20 °C)

Flash point:: 100 °C

storage temp.: 0-6°C

solubility: DMSO (Slightly), Methanol (Slightly)

pka: -4.17±0.40(Predicted)

form: solid

color: Colourless

Water Solubility: 0.024 g/100 mL

BRN: 619915

Stability:: Air Sensitive, Moisture Sensitive

Safety Information

Symbol(GHS): GHS05,GHS06,GHS09

Signal word: Danger

Hazard statements: H300+H310+H330-H318-H410

Precautionary statements: P262-P273-P280-P302+P352+P310-P304+P340+P310-P305+P351+P338

Hazard Codes: T+;N,N,T+

Risk Statements: 21-28-50/53-41-26-24

Safety Statements: 22-28-36/37-45-60-61-39-26

RIDADR: UN 2811

WGK Germany: 3

RTECS: TE2100000

HazardClass: 6.1(a)

PackingGroup: II

Toxicity: LD50 in adult male, female rats (mg/kg): 31, 32 orally (Gaines, Linder)

Use

Photolytic. When methidathion in an aqueous buffer solution (25°C and pH 7.0) was exposed to filtered UV light (l >290 nm) for 24 hours, 17% decomposed to 5-methoxy- 3H-1,3,4-thiadiazol-2-one. At 50°C, 56% was degraded after 24 hours. Degradation occurred via hydrolysis of the thiol bond of the phosphorodithioic ester. Under acidic and alkaline conditions, hydrolytic cleavage occurred at the C-S and P-S bonds, respectively (Burkhard and Guth, 1979). Smith et al. (1978) demonstrated that methidathion degraded to methidathion oxon at a faster rate in six air-dried soils than in moist soils. Half-lives for methidathion in the air-dried soils ranged from 19 to 110 days. In addition, methidathion degraded faster in an air-dried soil exposed to ozone (half-lives 2.5 to 7.0 days).Chemical/Physical. Emits toxic fumes of phosphorus, nitrogen and sulfur oxides when heated to decomposition (Sax and Lewis, 1987). Methidathion oxon was also found in fogwater collected near Parlier, CA (Glotfelty et al., 1990). It was suggested

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