Specification :

Metiram

Common name: metiram; mé tirame zinc
IUPAC name: zinc ammoniate ethylenebis( dithiocarbamate) - poly( ethylenethiuram disulfide)
Chemical Abstracts name: metiram ( composition not specified)
CAS RN: [ 9006-42-2]

PHYSICAL CHEMISTRY
Composition: No common name was accepted by ISO ( and metiram was withdrawn by BSI) , because the product appears to be a mixture rather than a complex. The dry form of the tech. is ' Metiram TC 85% ' . Mol. wt.: ( 1088.7) x M.f.: [ C16H33N11S16Zn3] x Form: Yellow powder ( tech.) M.p.: Decomposes at c. 156 º C. V.p.: 5400, guinea pigs 2400-4800 mg/ kg.
Skin and eye: Acute percutaneous LD50 for rats > 2000 mg/ kg. Mild skin and eye irritant.
Inhalation: LC50 ( 4 h) for rats > 5.7 mg/ l air.
NOEL: ( 2 y) for rats 3.1 mg/ kg.
ADI: 0.03 mg/ kg b.w. ( group ADI with mancozeb, maneb and zineb)
Toxicity class: WHO ( a.i.) III ( Table 5) ; EPA ( formulation) IV

ECOTOXICOLOGY
Birds: Slightly toxic to birds.
Fish: LC50 ( 96 h) for carp 85, rainbow trout 1.1 mg/ l. LC50 ( 48 h) for harlequin fish 17 mg/ l.
Daphnia: EC50 ( 48 h) 2.55 mg/ l.
Algae: EC50 ( 96 h) for Chlorella 0.3 mg/ l.
Bees: LD50 ( oral) > 40 ug/ bee; ( contact) > 16 ug/ bee.
Worms: LC50 ( 14 d) > 1000 ppm.

ENVIRONMENTAL FATE
Soil/ Environment: As with other dithiocarbamate pesticides, metiram is degraded to derivatives of thiourea, thiuram monosulfide, thiuram disulfide, and sulfur.