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| | FENCHLORPHOS Basic information |
| | FENCHLORPHOS Chemical Properties |
| Melting point | 41.0℃ | | Boiling point | 97℃ | | density | 1.485 g/cm3 (25 ºC) | | vapor pressure | 5.29 at 20 °C, 18.6 at 30 °C (Freed et al., 1977) | | refractive index | 1.5585 (589.3 nm 20℃) | | Fp | -18 °C | | storage temp. | APPROX 4°C
| | solubility | Soluble in acetone, carbon tetrachloride, ether, kerosene, methylene chloride, and toluene
(Windholz et al., 1983) | | form | solid | | color | White to light brown, waxy solid | | Water Solubility | 40mg/L(room temperature) | | Merck | 13,8337 | | BRN | 1885571 | | Henry's Law Constant | 8.46 at 25 °C (approximate - calculated from water solubility and vapor pressure) | | Exposure limits | NIOSH REL: TWA 10 mg/m3, IDLH 300 mg/m3; OSHA PEL: TWA
15 mg/m3; ACGIH TLV: TWA 10 mg/m3. | | EPA Substance Registry System | Ronnel (299-84-3) |
| | FENCHLORPHOS Usage And Synthesis |
| Chemical Properties | Powder or granules. Insoluble
in water; soluble in most organic solvents.
| | Chemical Properties | Ronnel is a white to light tan crystalline
solid. | | Uses | Insecticide. | | Uses | Systemic insecticide in livestock | | Definition | ChEBI: Fenchlorphos is an organic thiophosphate. | | General Description | White to light-tan crystalline solid. Mp: 41° C, Density :1.49 g cm-3 at 25°C. Biocidal (toxic to all animal life in differing degrees) by its action as a cholinesterase inhibitor. Used as an insecticide. Degrades readily in the environment by hydrolysis and oxidation. | | Reactivity Profile | FENCHLORPHOS is non-flammable and non-combustible. Decomposes with heating to evolve toxic and corrosive vapors (hydrogen chloride, phosphorus oxides, sulfur oxides). Incompatible with strong oxidizing agents. | | Hazard | Toxic by ingestion and inhalation.
Cholinesterase inhibitor, use may be restricted.
Questionable carcinogen.
| | Health Hazard | Ronnel is a weak cholinesterase
inhibitor and has low toxicity.
On both single and repeated doses, ronnel
affects the pseudoesterase of the plasma rather
than the true acetylcholinesterase of the red
blood cells.Ronnel has not been shown to potentiate
the effect of other commonly used organophosphorus
insecticides. | | Safety Profile | Poison by ingestion and intraperitoneal routes. Moderately toxic by skin contact. A cholinesterase inhibitor. An experimental teratogen. Experimental reproductive effects. Human mutation data reported. When heated to decomposition it emits very toxic fumes of Cl-, POx, and SOx. See also PARATHION and CHLOROPHENOLS. | | Potential Exposure | Ronnel is both an organochlorine and
organophosphorus compound; potential danger to those
involved in manufacture, formulation and application of this
insecticide for farm (livestock) and household uses. Degrades
readily in the environment by hydrolysis and oxidation . | | Environmental Fate | Chemical/Physical. Though no products were identified, the reported hydrolysis halflife at pH 7.4 and 70°C using a 1:4 ethanol/water mixture is 10.2–10.4 hours (Freed et
al., 1977). Ronnel decomposed at elevated temperatures on five clay surfaces, each treated
with hydrogen, calcium, magnesium, aluminum and iron ions. At temperatures <950°C
(125, 300 and 750°C), bentonite clays impregnated with technical ronnel (18.6 wt %)
decomposed to 2,4,5-trichlorophenol and a rearrangement product tentatively identified
as O-methyl S-methyl-O-(2,4,5-trichlorophenyl) phosphorothioate (Rosenfield and Van
Valkenburg, 1965). At 950°C, only the latter product formed. It was postulated that this
compound resulted from an acid-catalyzed molecular rearrangement reaction. Ronnel also
undergoes base-catalyzed hydrolysis at elevated temperatures. Products include methanol
and a new compound that is formed via cleavage of a methyl group from one of the
methoxy groups, which is then bonded to the sulfur atom (Rosenfield and Van Valkenburg,
1965).
Ronnel is stable to hydrolysis over the pH range of 5–6 (Mortland and Raman, 1967).
However, in the presence of a Cu(II) salt (as cupric chloride) or when present as the
exchangeable Cu(II) cation in montmorillonite clays, ronnel is completely hydrolyzed via
first-order kinetics in <24 hours at 20°C. The calculated half-life of ronnel at 20°C for
this reaction is 6.0 hours. It was suggested that decomposition in the presence of Cu(II)
was a result of coordination of the copper atom through the oxygen or sulfur on the
phosphorus atom resulting in the cleavage of the side chain containing the phosphorus atom forming O,O-ethyl-O-phosphorothioate and 1,2,4-trichlorobenzene (Mortland and
Raman, 1967).
Emits very toxic fumes of chlorides, sulfur and phosphorus oxides when heated to
decomposition (Lewis, 1990). | | Shipping | UN2811 Toxic solids, organic, n.o.s., Hazard
Class: 6.1; Labels: 6.1-Poisonous materials, Technical Name
Required. UN2783 Organophosphorus pesticides, solid, toxic,
Hazard Class: 6.1; Labels: 6.1-Poisonous materials. | | Incompatibilities | Incompatible with oxidizers (chlorates,
nitrates, peroxides, permanganates, perchlorates, chlorine,
bromine, fluorine, etc.); contact may cause fires or explo-
sions. Keep away from alkaline materials, strong bases,
strong acids, oxoacids, and epoxides. Store at temperatures
＜25-30℃. Organothiophosphates are susceptible to
formation of highly toxic and flammable phosphine gas in
the presence of strong reducing agents such as hydrideds
and active metals. Partial oxidation by oxidizing agents
may result in the release of toxic phosphorus oxides | | Waste Disposal | Incineration with added flam-
mable solvent in furnace equipped with afterburner and
alkali scrubber . In accordance with 40CFR165, follow
recommendations for the disposal of pesticides and pesti-
cide containers. Must be disposed properly by following
package label directions or by contacting your local or fed-
eral environmental control agency, or by contacting your
regional EPA office. |
| | FENCHLORPHOS Preparation Products And Raw materials |
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