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PARAQUAT

Posting date : May 30, 2011

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paraquat Common name paraquat (BSI, E-ISO, (m) F-ISO, ANSI, WSSA, JMAF); no name (Germany) IUPAC name 1,1'-dimethyl-4,4'-bipyridinediium; 1,1'-dimethyl-4,4'-bipyridinium; 1,1'-dimethyl-4,4'-bipyridylium Chemical Abstracts name 1,1'-dimethyl-4,4'-bipyridinium CAS RN [4685-14-7] EEC no. 225-141-7 PHYSICAL CHEMISTRY paraquat dichloride Composition Not normally isolated from the tech. products, which are >95% pure. Mol. wt. 257.2 M.f. C12H14Cl2N2 Form Colourless, hygroscopic crystals. M.p. Decomposes at c. 340 ºC V.p. <1 × 10-2 mPa (25 °C) KOW logP = -4.5 (20 °C) Henry <4 × 10-9 Pa m3 mol-1 (calc.) S.g./density 1.24-1.26 (20 ºC) Solubility In water c. 620 g/l (20 ºC). Practically insoluble in most organic solvents. Stability Stable in neutral and acidic media, but readily hydrolysed in alkaline media. Photochemically decomposed by u.v. irradiation in aqueous solution.