標準號：ISO 2366-1974
中文標準名稱：天然和人造冰晶石 鈉含量的測定 火焰發射和原子吸收分光光度法
英文標準名稱：Cryolite, natural and artificial; Determination of sodium content; Flame emission and atomic absorption spectrophotometric methods
標準類型：D59
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：D59
國際標準分類號：73.060.40
適用范圍：The methods are applicable as alternatives to products for which the molar ratio NaF/AlF3 is equal to about 3. The principle of the flame emission method consists in atomization of the test solution in a flame of oxygen/hydrogen and determination by measurement of the intensity of the radiation at 589 nm. The principle of the flame atomic absorption method is based on atomization in an air/acetylene flame and measuremnt of the absorption of the 589 nm line emitted by a sodium hollow-cathode lamp. The preparation of the test solution is carried out by dissolution of a test portion in hydrochloric acid and water after attack by concentreted sulphuric acid.