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Chemical Identification
Common Name
Naptalam
中文通用名
萘草胺
IUPAC
N-1-naphthylphthalamic acid
CAS
2-[(1-naphthalenylamino)carbonyl]benzoic acid
CAS No.
132-66-1
Molecular Formula
C18H13NO3
Molecular Structure
Category
Activity
Herbicide
Liquid and granular naptalam are used as selective preemergence herbicides for the control of a wide range of annual broadleaf weeds and grasses in soybeans, peanuts, cucumbers, melons, and established woody ornamental stock.  Naptalam may also be applied after emergence on soybeans.
CropUse
soybeans, peanuts, cucumbers, melons, and established woody ornamental stock
Weed Spectrum
control of a wide range of annual broadleaf weeds and grasses
Formulation
GR = Granule
SL = Soluble concentrate
Physical Properties
Molecular weight:291.3g/mol; Physical form:Crystalline solid. Density:1.36 (20℃); Melting point:185 ℃; Vapour pressure:<133 Pa (20℃); Henry constant:<1.94 × 102 Pa m3 mol-1 ; Partition coefficient(n-octanol and water):logP = 0.104 ( 5), 0.004 ( 7), -0.036 ( 9); pKa:4.6; Solubility:In water 200 /l (20℃). In acetone 5, dimethylformamide 39, dimethyl sulfoxide 43, methyl ethyl ketone 4, isopropanol 2, carbon tetrachloride 0.1 (all in g/). Practically insoluble in benzene, hexane, and xylene.; Stability:Hydrolysed in solutions of >9.5; unstable at elevated temperatures, forming N-(1-naphthyl)phthalimide.;
Toxicology
Oral:Acute oral LD50 for rats 1770 /. Percutaneous:Acute percutaneous LD50 for rabbits >5000 /kg. Severe eye irritant; mild skin irritant (rabbits). Inhalation:LC50 (4 h) for rats >2.07 /l air. Phytotoxicity:Phytotoxic to beet, tomatoes, spinach, and lettuce.
Environmental Profile
Ecotoxicology:
Bees:Not toxic to bees.Birds:LD50 for mallard ducks >4640 /kg. Dietary LD50(8 d) for mallard ducks and bobwhite quail >10 000 .Daphnia:EC50 (48 h) 118.5 /l.Fish:LC50 (96 h) for rainbow trout 76.1, bluegill sunfish 354.

Environmental fate:
Soil:Duration of residual activity is c. 3-8 w, depending on soil type and moisture content (E. Smith , J. Agric. Food Chem., 1957, 5, 748). For sandy loam, adsorption d 14.Plant:In plants, naptalam rapidly breaks down into phthalic acid and 1-naphthylamine.
Transport Information
Signal Word:WARNING; Hazard Class:II(Moderately hazardous)

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