標準號：ISO 1061-1990
中文標準名稱：塑料 未增塑的乙酸纖維素 游離酸度的測定
英文標準名稱：Plastics; unplasticized cellulose acetate; determination of free acidity
標準類型：G31
發布日期：1999/12/31 12:00:00
實施日期：1990/11/15 12:00:00
中國標準分類號：G31
國際標準分類號：83.080.20
適用范圍：The free acidity determined by this method includes acidity extractable by water and acidity due to acidic groups directly attached to the cellulose acetate, e.g. carboxyl groups. This method is not suitable for cellulose acetate containing any additives which may affect the test. The principle consists in treating a test portion of cellulose acetate with water and titrating the resultant solution with sodium hydroxide solution. The free acidity is calculated as the percentage, by mass, of free acetic acid in the cellulose acetate. This second edition cancels and replaces the first edition ISO 1061:1975, of which it constitutes a minor technical revision.