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ISO 2227:1972
M00001084
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ISO 2227:1972 Formaldehyde solutions for industrial use -- Determination of formaldehyde content
standard by International Organization for Standardization, 12/01/1972
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The specified method is applicable to HCHO contents between 25 5 and 45 %. The field of application may be extended by siutably modifying the mass of the test portion. The principle consists in the reaction of the test solution with a neutral sodium sulphite solution, and acidimetric titration of the liberated sodium hydroxide in presence of thymolphthalein as indicator.