Specification :

Deltamethrin

Common name: deltamethrin; deltamé thrine
IUPAC name: ( S) -a-cyano-3-phenoxybenzyl ( 1R, 3R) -3-( 2, 2-dibromovinyl) -2, 2-dimethylcyclopropanecarboxylate
Roth: ( S) -a-cyano-3-phenoxybenzyl ( 1R) -cis-3-( 2, 2-dibromovinyl) -2, 2-dimethylcyclopropanecarboxylate
Chemical Abstracts name [ 1R-[ 1a( S* ) , 3a] ] -cyano( 3-phenoxyphenyl) methyl 3-( 2, 2-dibromoethenyl) -2, 2-dimethylcyclopropanecarboxylate
Other names: decamethrin* ( rejected common name proposal)
CAS RN: [ 52918-63-5] ; [ 52820-00-5] ( ( RS) - ( 1R) -cis- isomer pair)

PHYSICAL CHEMISTRY
Composition: Tech. contains 98% deltamethrin ( i.e. the single isomer) . Mol. wt.: 505.2; M.f.: C22H19Br2NO3; Form: Colourless crystals. M.p.: 100-102 º C. V.p.: 1.24x10-5 mPa ( 25 ° C, gas saturation method) . KOW: logP = 4.6 ( 25 º C) . Henry: 3.13x10-2 Pa m3 mol-1 ( calc.) S.g./ density: Bulk density 0.55 g/ cm3 ( 25 º C) . Solubility: In water 5000 mg/ kg, depending upon carrier and conditions of the study; for dogs > 300 mg/ kg. Acute oral LD50 for formulations in rats: > 2000 mg ( of 15 g/ l EC) / kg; 445 mg ( of 25 g/ l EC) / kg; > 5000 mg ( of 5 g/ l UL) / kg; > 16 000 mg ( of 25 g/ kg WP) / kg; > 40 000 mg ( of 25 g/ l SC) / kg.
Skin and eye: Acute percutaneous LD50 for rats and rabbits > 2000 mg/ kg. Non-irritating to skin; mild eye irritant ( rabbits) .
Inhalation: LC50 ( 4 h) for rats 2.2 mg/ l air; ( 1 h) > 4.6 mg/ l air ( micronised) .
NOEL: ( 2 y) for mice 12, rats 1, dogs 1 mg/ kg b.w.
ADI: 0.01 mg/ kg b.w.
Other: Non-mutagenic and non-teratogenic ( mice, rats, rabbits) .
Toxicity class: WHO ( a.i.) II; EPA ( formulation) II

ECOTOXICOLOGY
Birds: Acute oral LD50 for mallard ducks > 4640 mg/ kg. Dietary LC50 ( 8 d) for mallard ducks > 8039, quail > 5620 mg/ kg diet. NOEL for reproduction for mallard ducks > 70, bobwhite quail > 55 mg/ kg daily.
Fish: Toxic to fish under laboratory conditions; LC50 ( 96 h) for rainbow trout 0.91, bluegill sunfish 1.4 ug/ l. Not toxic to fish under natural conditions.
Daphnia LC50 ( 48 h) 3.5 ug/ l.
Algae: EC50 ( 96 h) for algae ( Selenastrum capricornutum) > 9.1 mg/ l. Low LD50 and LC50 values under laboratory conditions do not represent a significant hazard to aquatic fauna in normal field use.
Bees: Toxic to bees, LD50 ( oral) 79 ng/ bee; ( contact) 51 ng/ bee. Low LD50 and LC50 values under laboratory conditions do not represent a significant hazard to bees in normal field use.
Worms: LC50 ( 14 d) for earthworms > 1290 mg/ kg soil.

ENVIRONMENTAL FATE
Animals: In rats, following oral administration, elimination occurs within 2-4 days. The phenyl ring is hydroxylated, the ester bond hydrolysed, and the acid moiety is eliminated as the glucuronide and glycine conjugates.
Plants: No uptake through leaves and roots - non-systemic compound. No major metabolites, except in oily crops, where trans-deltamethrin is part of the residue definition.
Soil/ Environment: In soil, undergoes microbial degradation within 1-2 weeks. Kd 3790-30 000, Koc 4.6x105-1.63x107 cm3/ g, confirms strong adsorption by soil colloids and no risk of leaching. DT50 ( lab., aerobic) 21-25 d, ( anaerobic) 31-36 d. In field, DT50