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CIS-HEPTACHLOREPOXIDE EXO-, ISOMER B

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CIS-HEPTACHLOREPOXIDE EXO-, ISOMER B Basic information
CIS-HEPTACHLOREPOXIDE EXO-, ISOMER B Chemical Properties
  • Melting point:160-161.5℃
  • Boiling point:503.92°C (rough estimate)
  • Density 1.7335 (rough estimate)
  • vapor pressure 2.6(x 10-6 mmHg) at 20 °C (IARC, 1974)300(x 10-6 mmHg) at 30 °C (Nash, 1983)
  • refractive index 1.5000 (estimate)
  • Flash point:11 °C
  • storage temp.  APPROX 4°C
  • form Liquid
  • form neat
  • Water Solubility (μg/L):
    350 at 25–29 °C (Park and Bruce, 1968)
    275 at 25 °C (quoted, Warner et al., 1987)
  • Henry's Law Constant0.59(x 10-5 atm?m3/mol) at 5 °C, 0.84 at 15 °C, 1.48 at 20 °C, 2.27 at 25 °C, 3.26 at 35 °C:in 3% NaCl solution: 2.07 at 5 °C, 4.93 at 15 °C, 7.70 at 25 °C, 9.28 at 35 °C (gas stripping-GC, Cetin et al., 2006)
  • Exposure limitsACGIH TLV: TWA 0.05 mg/m3 (adopted).
  • EPA Substance Registry SystemHeptachlor epoxide (1024-57-3)
Safety Information
CIS-HEPTACHLOREPOXIDE EXO-, ISOMER B Usage And Synthesis
  • UsesThe cis-metabolite of organochlorine pesticide Heptachlor.
  • UsesNot known. A degradation product of heptachlor
  • DefinitionA degradation product of heptachlor that also acts as an insecticide.
  • General DescriptionHeptachlor epoxide is also a white powder. Bacteria and animals break down heptachlor to form heptachlor epoxide. The epoxide is more likely to be found in the environment than heptachlor. Heptachlor epoxide is a degradation product of heptachlor that occurs in soil and in or on crops when treatments with heptachlor, an insecticide, have been made. It forms readily upon exposing heptachlor to air. The U.S. EPA lists heptachlor epoxide as a possible human carcinogen.
  • Reactivity ProfileCIS-HEPTACHLOREPOXIDE EXO-, ISOMER B may react with acids, bases, and oxidizing and reducing agents.
  • HazardPossible carcinogen.
  • Health HazardACUTE/CHRONIC HAZARDS: Toxic.
  • Fire HazardNon-combustible, substance itself does not burn but may decompose upon heating to produce corrosive and/or toxic fumes. Containers may explode when heated. Runoff may pollute waterways.
  • Safety ProfileConfirmed carcinogen with experimental carcinogenic data. Poison by ingestion and intravenous routes. Human mutation data reported. When heated to decomposition it emits toxic fumes of Cl-. See also HEITACHLOR
  • SourceWhen heptachlor is ingested by dairy animals, it is metabolized to heptachlor epoxide, and stored in the fatty tissues. Heptachlor epoxide is present in the excreted milk and can be present in other dairy products (Meyer et al., 1960).
  • Environmental FateBiological. In a model ecosystem containing plankton, Daphnia magna, mosquito larva (Culex pipiens quinquefasciatus), ?sh (Cambusia af?nis), alga (Oedogonium cardiacum) and snail (Physa sp.), heptachlor epoxide degraded to hydroxychlordene epoxide (Lu et al., 1975). Using settled domestic wastewater inoculum, heptachlor epoxide (5 and 10 mg/L) did not degrade after 28 days of incubation at 25°C (Tabak et al., 1981). This is consistent with the ?ndings of Bowman et al. (1965). They observed that under laboratory conditions, heptachlor epoxide did not show any evidence of degradation when incubated in a variety of soils maintained at 45°C for 8 days. The soils used in this experiment included Lakeland sand, Lynchburg loamy sand, Magnolia sandy loam, Magnolia sandy clay loam, Greenville sandy clay and Susquehanna sandy clay (Bowman et al., 1965). When heptachlor epoxide was incubated in a sandy loam soil at 28°C, however, 1hydroxychlordene formed at yields of 2.8, 5.8 and 12.0% after 4, 8 and 12 weeks, respectively (Miles et al., 1971).
    Photolytic. Irradiation of heptachlor epoxide by a 450-W high-pressure mercury lamp gave two half-cage isomers, each containing a ketone functional group (Ivie et al., 1972). Benson et al. (1971) reported a degradation yield of 99% when an aceton
    Graham et al. (1973) reported that when solid heptachlor epoxide was exposed to July sunshine for 23.2 days, 59.3% degradation was achieved. In powdered form, however, only 5 days were required for complete degradation to occur.
    Chemical/Physical. Heptachlor epoxide will hydrolyze via nucleophilic attack at the epoxide moiety forming heptachlor diol which may undergo further hydrolysis forming heptachlor triol and hydrogen chloride (Kollig, 1993).
CIS-HEPTACHLOREPOXIDE EXO-, ISOMER B(1024-57-3)Related Product Information
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