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Common NameMetaldehyde
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中文通用名四聚乙醛
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IUPACr-2,c-4,c-6,c-8-tetramethyl-1,3,5,7-tetroxocane; 2,4,6,8-tetramethyl-1,3,5,7-tetraoxacyclo-octane
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CAS2,4,6,8-tetramethyl-1,3,5,7-tetraoxacyclooctane; acetaldehyde tetramer (but see Composition)
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CAS No.[108-62-3]
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Molecular FormulaC8H16O4 (tetramer); (C2H4O)x (homopolymer)
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Molecular Structure
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Category
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ActivityMolluscicide
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PremixMetaldehyde+Niclosamide ethanolamine
Carbaryl+metaldehyde
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Physical PropertiesMolecular weight:176.2 (tetramer); Physical form:Crystalline powder. Density:1.27 (20 °C); Composition:Metaldehyde is a tetramer of acetaldehyde; it is sometimes, incorrectly, referred to as a homopolymer of acetaldehyde. Melting point:246 °C (sealed tube); Flash point:50-55 °C (Abel-Pensky closed cup); Vapour pressure:6.6 × 103 (25 °C); Henry constant:3.5 Pa m3 mol-1; Partition coefficient(n-octanol and water):logP = 0.12; Solubility:In water 222 /l (20 °C). In toluene 530, methanol 1730 (both in /l, 20 °C).; Stability:Depolymerises and sublimes above 112 °C.;
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ToxicologyOral:Acute oral
50 for rats 283, mice 425 / . Percutaneous:Acute percutaneous 50 for rats >5000 /kg. Not a skin irritant (rabbits). Not a skin sensitiser (guinea pigs). Inhalation: 50 (4 h) for rats >15 /l air. Phytotoxicity:Non-phytotoxic when used as recommended. ADI:0.025 / Environmental ProfileEcotoxicology:
Algae:50 (96 h) 73.5 /l.Bees: 50 (oral) >87 mg/bee; (contact) >113 mg/bee.Birds:Acute oral 50 for quail 170 /kg. Dietary 50 (8 d) for quail 3460 .Daphnia: 50 (48 h) >90 /l.Fish: 50 (96 h) for rainbow trout 75 /l.Worms: 50 >50 000 .
Environmental fate:
Soil:Aerobic and anaerobic micro-organisms in soil decompose metaldehyde to CO2 and water.Transport InformationSignal Word:CAUTION; Hazard Class:II(Moderately hazardous)
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