標準號：IS 2362-1973
發布日期：1974/9/1 12:00:00
實施日期：1999/12/31 12:00:00
適用范圍：1.1 This standard describes the Karl Fischer method for determination of free water or water of crystallization or moisture in solid or liquid chemical products, both organic or inorganic.1.1.1 The method is not applicable to all the organic and inorganic chemical products. The limitations are:a) oxidizing agents, such as chromates, dichromates, cupric and ferric salts, and higher oxides and peroxides;b) reducing agents, such as sulphides, thiosulphates and stannous salts;c) compounds which may form water with components of Karl Fischer reagent, namely, basic zinc oxide, salts of weak oxyacids, alkali carbonates and bicarbonates, and borates; andd) organic compounds, such as quinones, ascorbic acid, peroxy compounds, active carbonyl compounds, nitrogen compounds containing amino or hydrozo nitrogen, and sulphur compounds where sulphur is not bonded with oxygen. In some cases the method can be employed with minor modification before operating the final titration.1.1.2 This standard prescribes two methods, namely, visual and electro-metric depending on whether the end point is detected visually or electrometrically.