Determination of hydrogen in stainless steels by spark-source mass spectrometry |
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Authors: | Morimasa Saito |
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Affiliation: | Materials Characterization Division, National Research Institute for Metals, 3-12, 2-Chome, Nakameguro, Meguroku, Tokyo Japan |
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Abstract: | A spark-source mass spectrometric (SSMS) method capable of determining traces of hydrogen in micro-volumes of metals was developed by using a pointed metal probe technique. The hydrogen background was decreased to μg g?1 levels by the combination of a method in which the sample in the ion source is baked under vacuum at 323–343 K for more than 25 ks and a liquid nitrogen or liquid helium cryogenic pump method. This method was applied to the analysis of austenitic stainless steels at μg g?1 hydrogen levels, and the relative standard deviation was within 20% for samples with hydrogen concentrations ranging from 2 to 4 μg g?1. The relative sensitivity coefficent was 2.3 (Fe=1). |
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Keywords: | Hydrogen Stainless steel |
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