Determination of the composition of alloying elements in stainless steel by solution spark technique

A method has been developed for the simultaneous determination of chromium, nickel, manganese and molybdenum in stainless steel using the rotating disc graphite electrode. The alloy is dissolved in sulphuric acid and a 4 mg/ml solution is taken in a porcelain boat. The rotating disc electrode with its rim kept dipped in the solution, fed the sample continuously to the spark plasma. The resulting spectra are photographed using the 3.4M Ebert grating spectrograph. The precision of the method is found to be around 5 per cent. (author). 5 refs., 4 tabs