Determination of Cr、Fe、Mo、W in Hastelloy C-276 Alloy by ICP-OES with Microwave Digestion Method

A method for the determination of Cr, Fe, Mo and W in Hastelloy C-276 alloy using an inductively coupled plasma-optical emission spectrometer (ICP-OES) with the microwave digestion method was developed. The sample was dissolved completely with 10 mL of hydrochloric acid-hydrofluoric acid-nitric acid (with 10:1:1 volume ratio). Experimental conditions, including comparison of different methods for the dissolution of alloy the selection of elemental line, background correction and optimization of instruments parameters, were discussed and optimized. The analytical spectral lines for elements were selected as follows: Cr 267.716 nm, Fe 238.204 nm, Mo 202.031 nm, W 209.712 nm. The linear correlation coefficients of the calibration curves were all over 0.999 5.The relative standard deviations (RSD, n=6) of the determination results were less than 1.64%, the recovery rates were from 97.8% to 102.7%. Compared with the certified values by the standard sample of nickel base, the results showed that the method is rapid and accurate, and can satisfy with the requirements of daily testing.