翻訳と辞書 Words near each other ・ Nitrogen oxide sensor ・ Nitrogen pentafluoride ・ Nitrogen rejection unit ・ Nitrogen rule ・ Nitrogen tribromide ・ Nitrogen trichloride ・ Nitrogen trifluoride ・ Nitrogen triiodide ・ Nitrogen washout ・ Nitrogen-13 ・ Nitrogen-15 nuclear magnetic resonance spectroscopy ・ Nitrogen-vacancy center ・ Nitrogenase ・ Nitrogenase (flavodoxin) ・ Nitrogenous base ・ Nitrogen–phosphorus detector ・ Nitroglycerin ・ Nitroguanidine ・ Nitroimidazole ・ Nitrome ・ Nitromemantine ・ Nitromersol ・ Nitromethane ・ Nitromethane (data page) ・ Nitromethaqualone ・ Nitromors ・ Nitron ・ Nitronate ・ Nitronate monooxygenase ・ Nitrone Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Nitrogen–phosphorus detector ： ウィキペディア英語版 Nitrogen–phosphorus detector The nitrogen–phosphorus detector (NPD) or thermionic specific detector (TSD) is a type of detector commonly used with gas chromatography, in which thermal energy is used to ionize an analyte. It is a type of flame thermionic detector (FTD), the other being the alkali flame-ionization detector (AFID also known as AFD). With this method, nitrogen and phosphorus can be selectively detected with a sensitivity that is 104 times greater than that for carbon. NP-Mode: A concentration of hydrogen gas is used such that it is just below the minimum required for ignition. A rubidium or cesium bead, which is mounted over the nozzle, ignites the hydrogen (by acting catalytically), and forms a cold plasma. Excitation of the alkali metal results in ejection of electrons, which in turn are detected as a current flow between an anode and cathode in the chamber. As nitrogen or phosphorus analytes exit the column, they cause a reduction in the work function of the metal bead, resulting in an increase in current. Since the alkali metal bead is consumed over time, it must be replaced regularly . == See also== * Gas chromatography 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Nitrogen–phosphorus detector」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.