ISO 5316-1977 - 中外标准 - - 1977/8 - 现行
The method consists in dissolving in water of the phosphorus(V) oxide in a test portion by shaking, using a rotary shaker under specified conditions.
萃取磷含量测定肥料农业化学分析氧化磷化学分析和试验AgricultureChemical analysis and testingDetermination of contentExtractionFertilizersPhosphorus
ISO 3963-1977 - 中外标准 - - 1977/7 - 现行
The method should be used only where other methods, such as automatic sampling of scoop sampling from a free fall, are impossible, or as a reference method.It consists in inserting of two parallel boards or metal sheets vertically down into and at right angles to the streams of the material and to the axis of the stopped belt, and removing of the material between the boards or sheets.
CNS 4130-1981 - 中外标准 - - 1977/6 - 废止