ISO 3360-1976 工业(包括食品)用磷酸和磷酸钠 氟含量的测定 茜素配位酮和硝酸镧光度法

标准号：ISO 3360-1976
中文标准名称：工业(包括食品)用磷酸和磷酸钠 氟含量的测定 茜素配位酮和硝酸镧光度法
英文标准名称：Phosphoric acid and sodium phosphates for industrial use (including foodstuffs); Determination of fluorine content; Alizarin complexone and lanthanum nitrate photometric method
标准类型：G10
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G10
国际标准分类号：71.060.30
适用范围：Applicable to products the F content of which is equal to or more than 0.5 mg/kg. Specifies the separation of the element from a test portion by steam distillation in a phosphoric acid medium. Formation of a blue-coloured complex with a combined reagent alizarin complexone/lanthanum nitrate in a buffered medium at the pH of 4.6. Addition of acetone to increase the stability of the complex and the sensitivity. Photometric measurement of the complex at a wavelength of about 600 nm.