Key points of the method:
The national standard for the mother liquor method and the rapid method in front of the furnace is roughly the same. The dissolved sample is obtained by low-temperature dissolution and oxidation of sulfur nitrate mixed acid, and graphite carbon needs to be filtered. The precautions for the mother liquor method are that the sample should not be coarse, otherwise the ammonium persulfate will have already decomposed before the sample is dissolved, resulting in a lower measurement result of phosphorus element. This method has a slow color development when measuring manganese and phosphorus elements, and can be compensated for by appropriate heating in an electric furnace at low room temperature.
The manganese mother liquor exists in a certain acidity state, and silver nitrate is used as a catalyst. Ammonium persulfate oxidizes manganese to permanganate.
Phosphorus is in a orthophosphate state and reacts with ammonium molybdate to form yellow phosphomolybdic acid, which is reduced to blue phosphomolybdic acid by ascorbic acid.
Silicon in an acidic solution forms a yellow silicomolybdic acid complex with ammonium molybdate, which is reduced to silicomolybdic blue by ammonium ferrous sulfate.
The metal element analyzers applicable to this method are:
XY-FB microcomputer high-speed analyzer XY-FC microcomputer high-speed analyzer XY-FD computer multi-element analyzer
XY-3A Intelligent Element Analyzer XY-3B Intelligent Element Analyzer XY-1A Intelligent Element Analyzer