ISO 622-1981 固体矿物燃料 磷含量的测定 还原磷钼酸盐光度法

标准号：ISO 622-1981
中文标准名称：固体矿物燃料 磷含量的测定 还原磷钼酸盐光度法
英文标准名称：Solid mineral fuels; Determination of phorphorus content; Reduced molybdophosphate photometric method
标准类型：D20
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：D20
国际标准分类号：75.160.10
适用范围：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.