Tham khảo tài liệu 'chemical pollutants in air, water, soil, and solid wastes phần 9', khoa học tự nhiên, công nghệ môi trường phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 47C Volatility of Some Additional Organic Substances Not Listed in the Text for Purge and Trap Analysis Continued CAS no. Compound Boiling point C Vapor pressure at 20 C torr 2567-14-8 1 1 2-Trichloropropylene 118 20 c 354-58-5 1 1 1-Trichloro-2 2 2-trifluoroethane 46 275 c 76-13-1 1 1 2-Trichloro-1 2 2-trifluoroethane 48 270 110-62-3 Valeraldehyde 103 50 at 25 C 108-05-4 Vinyl acetate a 72 83 593-60-2 Vinyl bromide 700 109-93-3 Vinyl ether 28 600 c a Poor purging efficiency because of moderate solubility in water. b Compounds show high retention times on GC chromatogram. c Vapor pressure estimated. 1997 by CRC Press LLC 47C Volatility of Some Additional Organic Substances Not Listed in the Text for Purge and Trap Analysis Continued CAS no. Compound Boiling point C Vapor pressure at 20 C torr 2567-14-8 1 1 2-Trichloropropylene 118 20 c 354-58-5 1 1 1-Trichloro-2 2 2-trifluoroethane 46 275 c 76-13-1 1 1 2-Trichloro-1 2 2-trifluoroethane 48 270 110-62-3 Valeraldehyde 103 50 at 25 C 108-05-4 Vinyl acetate a 72 83 593-60-2 Vinyl bromide 700 109-93-3 Vinyl ether 28 600 c a Poor purging efficiency because of moderate solubility in water. b Compounds show high retention times on GC chromatogram. c Vapor pressure estimated. 1997 by CRC Press LLC APPENDIX G ANALYSIS OF ELEMENTS BY ATOMIC SPECTROSCOPY AN OVERVIEW Technique Principle Comparison comments Flame-AA Atomic absorption sample is vaporized Single element and atomized in high temperature flame determination detection Atoms of the analyte element absorb limits relatively higher light of a specific wavelength from a than other techniques hollow cathode lamp passing through the flame. Amount of energy absorbed by these atoms is measured which is proportional to the number of atoms in the light path. Components lamp flame monochromator and detector. Graphite furnace-AA Atomic absorption flame is replaced by Single element an electrically heated graphite tube into determination capability which sample is .
