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Chemical Identification
Common Name
Nitrapyrin
中文通用名
三氯甲基吡啶
IUPAC
2-chloro-6-trichloromethylpyridine
CAS
2-chloro-6-(trichloromethyl)pyridine
CAS No.
1929-82-4
Molecular Formula
C6H3Cl4N
Molecular Structure
Category
Activity
Bactericide, nitrification inhibitor
Physical Properties
Molecular weight:230.9g/mol; Physical form:Colourless crystals. Density:1.579 (25℃); Melting point:62.5-62.9℃; Flash point:>93℃ (Tag closed cup); Vapour pressure:6.4 × 102 mPa (25℃); 3.7 × 102 mPa (23℃); Henry constant:1.4 Pa m3 mol-1 (25 ℃, calc.); Partition coefficient(n-octanol and water):logP = 3.32; Solubility:In water 72 ppm (25℃). In anhydrous ammonia 540 g/ kg (22 ℃); in ethanol 300 g/ kg (20℃). In acetone 1.98, dichloromethane 1.85, xylene 1.04 (all in kg/ kg, 26 ℃).; Stability:Stable under normal conditions. Aqueous DT50 7.4 d (sterile, pH 5, 7, 9). Photolysis DT50 9.4 d (pH 7).
Toxicology
Oral:Acute oral LD50 for rats 1072-1231, mice 713 mg/ kg. Percutaneous:Acute percutaneous LD50 for rabbits 2830 mg/ kg (solid), 848 mg/ kg (solution). Inhalation: LC50 >2.75 ppm vapour (time-weighted average).
Environmental Profile
Ecotoxicology:
Algae: ErC50 for green algae (Selenastrum capricornutum) 0.92-1.7 mg/l.Birds:Acute oral LD50 for chickens 235, mallard ducks 2708 mg/kg. Dietary LC50 (8 d) for mallard ducks 1466, Japanese quail 820 mg/ kg.Daphnia: LC50 2.2-5.8 mg/l.Fish: LC50 for rainbow trout 6.5-9.1, goldfish 7.6, fathead minnow 9.6-10.2, channel catfish 8.0, bluegill sunfish 3.4-7.9 mg/l.Other aquatic spp.:Acute EC50 (shell deposition) for eastern oyster (Crassostrea virginica) 1.8 mg/l, grass shrimp (Palaemonetes pugio) 3.1 mg/l.Other beneficial spp.:Causes no mortality of ramshorn snails at 10 mg/l.?

Environmental fate:
?Animals:Metabolism is the same as in soil.Soil:Hydrolysed in soil to 6-chloropyridine-2-carboxylic acid (6-chloropicolinic acid), which is absorbed by plants and is the principal metabolite (C. T. Redeman et al., J. Agric. Food Chem., 1964, 12, 207; 1965,
Transport Information
Hazard Class:III(Slightly hazardous)

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