Chemical analysis gas chromatography

Chemical Analysis. Gas chromatography-mass spectrometry (GC-MS) and high-performance liquid chromatography (HPLC) techniques were used to analyze 4-chlorophenol and its oxidation intermediates. For GC-MS analysis, the samples were acetylated in pyridine. The samples were first evaporated to dryness. Then 200 xL of pyridine and 200 (xL of acetic anhydride were added to the dry residue. The samples were heated at 65 °C for 2-3 h to ensure the complete acetylation reaction, and then gently evaporated to dryness in a nitrogen stream. Finally, the residue was redissolved in 0.1 mL of hexane for GC analysis. A GC (HP model 5890) equipped with mass selective detector (HP model 5971) and SPB-5 capillary column (Supelco Co., PA., 25- X 0.2-mm i.d. X 0.33-p.m film thickness) was used. To separate different intermediate products, various oven-temperature programs were performed. The GC-MS interface line was maintained at 300 °C. The mass-... 

These data were measured by chemical analysis, gas chromatography, beta-ray scintillation and gamma-ray spectrometry. The sodium impurity concentrations were also determined by the sodium temperature in the plugging indicator. As an example, the trend of oxygen and hydrogen in the primary sodium are shown in Fig. 11. 

Fuj] Chemical analysis, gas chromatography 1550°C, solubility and activity of Ca and 0 in CaO-Ca-0 alloy-molten Fe under variable calcium potential. 

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