Analytical Sciences

Abstract − Analytical Sciences, 19(2), 325 (2003).

Direct Determination of Arsenic in Steel by Glow Discharge Optical Emission Spectrometry with Argon-Helium Mixed Gas
Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai 980-8577, Japan
In glow discharge optical emission spectrometry, an argon–helium mixed gas plasma was investigated to improve the detection sensitivity of arsenic in steel samples. The emission line of arsenic was enhanced and the background intensity was simultaneously reduced when an Ar-He plasma was employed instead of an Ar plasma, which is effective for the sensitive determination of arsenic. The detection limits were calculated to be 0.009 mass% for a 700-V Ar plasma, 0.004 mass% for a 700-V Ar-He plasma, and 0.001 mass% for a 900-V Ar-He plasma.