Abstract
Most of blank and surface gases from a boat and a specimen in the vacuum gas extrcttion method is attributed to adsorption of gases in air. The value of blank or surface gas occupies 50% of the total extraction gas content when the specimen contains a small amount of gas. When the specimen is heated on the boat in the vacuum hot extracting apparatus (VHE), diffusive hydrogen starts to be extracted from about 15min. and completes after 45min. When the specimen is directly heated without the boat, extraction of hydrogen is so accelerated that the extraction time is shortened by 15 to 20min. Although the vacuum fusion extraction method (VFE) appreciably shortens the extraction time as compared with the VHE method, the advantage of time saving is counterbalanced when extracting only the diffusive hydrogen, because the blank gas of the vessel shall be considered.
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