论文部分内容阅读
本文报导用 Tenax-GG 前置柱(60～80目,18cm×4mm 内径的玻璃柱)或 Tenax-GG 加碱性前置柱(充填涂布了2%氢氧化钾的30～60目的玻璃珠,3cm×8mm内径的玻璃柱)的气相色谱测定空气中 ppb 水平的11种酚。即:(苯)酚,邻-、间-、和对-甲酚,2,3-、2,5-、2,6-、3,4-、和3,5-二甲苯酚,邻-和对-乙基苯酚。基于用 Tenax-GG 或Tenax-GG 加碱性前置柱所得色谱图的差异来鉴别和测定11种酚。色谱条件如下:主分析柱:充填涂布了0.1%SP-1000的 GarbopackG(80～100目)1.75m×3mm内径的玻璃柱。柱温220℃,氮为载气,流速37ml/分。除2,3-和3,5-二甲苯酚的峰重叠外,11种酚在18分钟内完全分离。Tenax-GG 和碱性前置柱的条件:在室温(无拖尾现象。25℃左右)采样后,加热到250℃ 35秒钟后,导入配有氢焰离子化鉴定器的气相色谱仪内。本法对
This article reports the use of Tenax-GG front column (60-80 mesh, 18 cm x 4 mm ID glass column) or Tenax-GG plus alkaline front column (30-60 mesh glass beads coated with 2% potassium hydroxide , 3 cm x 8 mm id glass column) was used to determine eleven phenols at ppb level in the air. (Phenols), o-, m- and p-cresol, 2,3-, 2,5-, 2,6-, 3,4-, and 3,5-xylenol, And p-ethylphenol. Eleven phenols were identified and determined based on differences in chromatograms obtained with Tenax-GG or Tenax-GG plus alkaline pre-columns. The chromatographic conditions were as follows: Main analytical column: A glass column packed with Garbopack G (80 to 100 mesh) having an inner diameter of 1.75 m × 3 mm coated with 0.1% SP-1000. Column temperature 220 ℃, nitrogen as carrier gas, flow rate 37ml / min. Except for the peak overlap of 2,3- and 3,5-xylenol, eleven phenols were completely separated in 18 minutes. Tenax-GG and alkaline pre-column conditions: After sampling at room temperature (no tailing phenomenon .25 ℃), the sample was heated to 250 ℃ for 35 seconds and then introduced into a gas chromatograph equipped with a hydrogen flame ionization detector . This law is correct