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微量氢是稀有气体氦、氖、氩、氪、氙中的主要有害杂质。以往用变温浓缩-热导法进行测定,氩、氪、氙中氢以纯氩为载气可测至ppm级,但氦、氖中氢的测定需用浓缩法才能测至几个ppm,而且必须用纯氖或氦为载气。装置复杂,操作麻烦,样品消耗量大,分析速度慢。气敏色谱仪是用气敏半导体作为检测器的一种色谱仪。气敏半导体又称气敏电阻,是对气体特别敏感的一种半导体,当它遇到不同气体成分时,其电阻发生不同的显著变化(10~3-10~6欧)。一般认为,气
Trace amount of hydrogen is a rare gas helium, neon, argon, krypton, xenon in the main harmful impurities. In the past by variable temperature condensation - thermal conductivity method for determination, argon, krypton, xenon hydrogen to pure argon carrier gas can be measured to ppm level, but the helium, neon hydrogen concentration required to measure the concentration of a few ppm, and must Use pure neon or helium as carrier gas. The device is complicated, the operation is troublesome, the sample consumption is big, the analysis speed is slow. Gas chromatographs are gas chromatographs that use a gas-sensitive semiconductor as a detector. Gas-sensitive semiconductors, also known as gas-sensitive resistors, are gases that are particularly sensitive to semiconductors. When they encounter different gas compositions, their electrical resistance varies significantly (10 to 3-10 to 6 ohms). Generally believed that gas