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method for serienmässigen determination of nitrogen - and oxygen content of metallproben
method for serienmässigen determination of nitrogen - and oxygen content of metallproben
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机译：原子吸收光谱法测定金属脯氨酸的氮和氧含量的方法
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1,068,214. Gas content of metal samples. BALZERS PATENT-UND LIZENZ-ASTALT. Oct. 15, 1964, No. 42065/64. Heading B1X. The combined nitrogen and carbon monoxide content of the gases given off by a series of metal samples is determined by a method comprising fusing the sample 3 in carbon or graphite crucible 2 in vacuum extraction furnace 1, supplying the gases evolved to thermal conductivity measuring apparatus 5 by means of pump 4, adding hydrogen from reservoir 9 to the gases until a predetermined total pressure is reached, the supply of hydrogen being automatically controlled in response to the pressure measured by manometer 6, and measuring the thermal conductivity of the gas mixture. The apparatus may include carbon monoxide analyser 10, for example an infra red absorption instrument, whereby the amount of oxygen and hence the amount of nitrogen evolved by the sample may be calculated.
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