This standard stipulates that the following methods are used to determine the content of potassium oxide and sodium oxide in alunite ore: method Ⅰ: Potassium tetraphenylborate gravimetric method to determine the content of 1.00-7.00% potassium oxide in alunite ore; method Ⅱ: flame emission spectrophotometry Determination of 1.00-7.00% potassium oxide content and 0.10-2.00% sodium oxide content in alunite ore.
GB 4581.7-1984 history
1984GB 4581.7-1984 Alunite ores--Determination of potassium and sodium contents--Potassium tetraphenylborate gravimetric method and flame emission spectrophotometric methods