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ISO 8661:1988 Caprolactam for industrial use -- Determination of volatile bases content -- Titrimetric method after distillation
standard by International Organization for Standardization, 05/01/1988
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The volatile bases are distilled in alkaline medium under specified conditions and collected in a known volume of a standard volumetric hydrochloric acid solution in the presence of an indicator. The excess of the acid is titrated with a standard volumetric sodium hydroxide solution.