• Appearance: Clean, white to yellow powder
• Identification IR: Passes test (USP, BP)
• Identification UV: - Absorptivities at 246 nm (calculated on dried basis) do not differ by more than 3.0 (USP) - At 246 nm absorbance about 0.84 and at 262 nm absorbance about 0.80 (BP)
• Identification Chlorides: Passes test (BP)
• Identification Naphtalene diol: Deep violet colour / passes test (BP)
• Thin layer chromatography: Passes test
• Assay – HPLC (dry basis): 97.5 – 101.0 % (USP)
• Assay – Titration (dry basis): 97.5 – 101.0 % (BP)
• Impurities: a-Picoline: Absorbance at 262 nm ≤ 0.52 (BP)
• Total volatile alkalies: Max. 1.0 %
• Loss on drying: Max. 1.0 % (USP, BP)
• Surface active agent: Max. 0.025 %
• Residue on ignition/Sulphated ash: Max. 0.1 % (BP)
• Microscopic examination: Passes test
• Absence of extraneous matter: Passes test
• Solubitity: Freely soluble in water
• Organic volatile impurity-GC: - o-Xylene: Max. 50 ppm - m-Xylene: Max. 50 ppm - p-Xylene: Max 50 ppm - Isopropanol: Max. 200 ppm

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• Appearance: A white powder
• Identification: Conformation
• Loss on drying: Not more than 0.5 %
• Residue on ignition: Not more than 0.3 %
• Heavy metals: Not more than 20 ppm
• Arsenic: Not more than 2 ppm
• Related material: Not more than 1.0 %
• Assay (3,5-dichlor-2,6-dimethyl1-4-hydroxypyridine): Not less than 98.0 % and not more than 1-2.0 % (98.0-102.0)

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• Characters: Almost white or light yellow powder; practically odorless
• Identification: UV: absorption max. at 220 nm – 277 nm - IR: conforms to the reference spectrum
• Related substances (HPLC): total impurities ≤ 2.5 %
• Loss on drying: ≤ 0.5 % (105°C)
• Residue on ignition: ≤ 0.1 %
• Heavy metals: ≤ 20 ppm
• Assay (HPLC): ≥ 96.0 % (dried substance)

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