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Rotating-Disk-Sample Electrode Method

Volume 17, Number 3 (May 1963) Page 76-77

Wang, M.S.

Sample rotation during excitation in metal emission spectroscopy is quite common. Rotating sample holders are available commercially. The advantages of sample rotation during excitation are: 1) More representative sampling is achieved as more of the sample surface is exposed to electrical discharge; 2) Improved spectral intensity, because a larger area of sample is exposed during emission; and 3) Minimum matrix effect, because the rotating sample can avoid local heating. Results with techniques using rotating samples have been reported by Wang (1) and Wang, et al., (2) who used briquetted soil samples, which had been fused and mixed with graphite, by Mitchell and Scott (3), who used plant-ash briquets, and also by Gillete et al., (4) who analyzed cements and nickel ores.