ISO 4829-1:1986

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ISO 4829-1:1986, Steel and cast iron – Determination of total silicon content – Reduced. molybdosilicate spectrophotometric method – Part 1 : Silicon contents between 0.05. and 1.0 % shall be classified under the title of the sub-group. 77.080.01 Ferrous metals in general.

ISO 4829-1:1986, titled "Steel and cast iron — Determination of total silicon content — Reduced molybdosilicate spectrophotometric method — Part 1: Silicon contents between 0.05% and 1.0%," specifies a spectrophotometric method for determining the total silicon content in steel and cast iron. This method is applicable to silicon concentrations ranging from 0.05% to 1.0%. The procedure involves dissolving a test portion in an appropriate acid mixture, fusing the acid-insoluble residue with sodium peroxide, and forming an oxidized molybdosilicate complex in a weak acid solution. The complex is then selectively reduced to a blue complex using ascorbic acid, and the absorbance is measured spectrophotometrically at approximately 810 nm