Question

In ductile cast iron free carbon is distributed in form of

Answer 1

The determination of combined carbon in cast iron may be completed absorptiometrically since Beer's Law is obeyed. As the intensity of colour produced by a given sample varies with conditions, e.g., acid concentration and time of heating the solution, a standard must be included in each batch of determinations. The optimum conditions for colour development are noted. Colour stability is good.