Determination of Chromium Content in Ferrosilicon Inoculant with Flame Atomic Absorption Method
The samples were dissolved by nitric acid and hydrofluoric acid, driving the fluoride ions out of the solution with smoking perchloric acid, adding hydrochloric acid hydroxylamine to reduce the ferric ion to ferrous ion in the acetic acid sodium acetate buffer, and combining phenanthroline with divalent iron ions to generate the complex to eliminate the interference of iron ions to the determination of chromium with flame atomic absorption sepectrometry. This method has the advantages of high sensitivity, good stability, reliable results and other characteristics, and can meet the needs in daily production testing because of the simple and convenient operation, the low detection cost.