21. Gases in the cabin can be tested using gas chromatography , mass spectrometry and infra-red spectrophotometry. 22. Analysis by gas chromatography ( GC ) is the method of choice for FAME analysis. 23. The farm samples were tested by gas chromatography , the tests being run for several hours. 24. In gas chromatography , the sample has to be volatilized at high temperatures, a tricky venture. 25. Methods for detection in urine specimens usually involve gas chromatography -mass spectrometry or liquid chromatography-mass spectrometry. 26. This is why they are used in gas chromatography , thin layer chromatography and affinity chromatography. 27. Diallyl disulfide can be easily detected in the air or in the blood with gas chromatography . 28. These included mass spectrometry and gas chromatography instruments. 29. This step removes contaminant gases like hydrocarbons and halocarbons which can be removed by gas chromatography . 30. The compound was isolated by preparative gas chromatography .
