標準號：ISO 622-1981
中文標準名稱：固體礦物燃料 磷含量的測定 還原磷鉬酸鹽光度法
英文標準名稱：Solid mineral fuels; Determination of phorphorus content; Reduced molybdophosphate photometric method
標準類型：D20
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：D20
國際標準分類號：75.160.10
適用范圍：For taking the phosphorus into solution the following two methods are specified: The carbonaceous material is removed by ashing in amuffle furnace under specified conditions and the phosphorus is extracted by treatment with hydrofluoric and sulphuric acids. The carbonaceous material is removed by repeated oxidation with nitric acid in the presence of sulphuric acid. The determination is carried out by adding ammonium molybdate and ascorbic acid solution and measuring the absorbance of the resulting blue solution by a siutable optical instrument.