巻号一覧
53 巻 (2005)
- 6 号 p. 305-
- 5 号 p. 241-
- 4 号 p. 183-
- 3 号 p. 89-
- 2 号 p. 53-
- 1 号 p. 1-
53 巻, 5 号
選択された号の論文の4件中1～4を表示しています
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一般論文
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福尾 剛志, 宮本 裕美子, 尾崎 俊行, 荒川 隆一2005 年 53 巻 5 号 p. 241-245
発行日: 2005年
公開日: 2006/04/05
ジャーナル フリーThe volatile compounds from sweet potatoes were collected by solid phase micro extraction (SPME) and were analyzed by gas-chromatography mass spectrometry (GC/MS). The difference in a peak pattern of chromatograms was observed for various kinds of sweet potatoes. Possibility to identify a breed and a production district of sweet potatoes by the chromatograms obtained by SPME-GC/MS was examined.抄録全体を表示PDF形式でダウンロード (595K) -
佐藤 浩昭, 清野 晃之, 鳥村 政基, 島田 和江, 山本 淳, 田尾 博明2005 年 53 巻 5 号 p. 247-256
発行日: 2005年
公開日: 2006/04/05
ジャーナル フリーDesorption ionization on porous silicon-mass spectrometry (DIOS-MS) was applied to the analysis of various polymer additives, including ultraviolet absorbers (UVA), hindered amine light stabilizers (HALS), hindered phenol type primary antioxidants, and thioether type and phosphite type secondary antioxidants. First, molecular weight distribution and detailed chemical structure of an oligomer type UVA with poly(ethylene glycol) (PEG) main chain could be characterized based on the clearly observed DIOS mass spectrum without interference peaks. Then, to enhance ionization efficiency of the additive samples, the use of cationization salts such as sodium iodide (NaI) and silver trifluoroacetate (AgTFA) was investigated. In spite of the use of cationization salts, nitrogen-containing additives such as UVA and HALS tended to form [M+H]+ peaks. However, for the other additives, the use of cationization salts served to enhance the formation of molecular-related ions: hindered phenol type and thioether type antioxidants preferred the formation of [M+Na]+ in the presence of NaI, whereas phosphite type antioxidants could be observed as [M+Ag]+ ions in the presence of AgTFA.抄録全体を表示PDF形式でダウンロード (1001K) -
松浦 宏行, 胡 暁軍, 月橋 文孝2005 年 53 巻 5 号 p. 257-264
発行日: 2005年
公開日: 2006/04/05
ジャーナル フリーReaction between molten oxide containing iron oxide and CO-CO2 gas is the essential reaction in numerous metallurgical smelting processes and the refining speed depends on this reaction rate. Therefore, the mechanism and kinetics for this reaction give us important information for the analysis, simulation and control of processes, and development of new refining systems. Many investigations have been done for clarification of reaction mechanisms between molten oxide containing iron oxide and CO-CO2 gas, however the direct measurement of oxygen exchange rate controlled by chemical reaction has not been conducted because of experimental difficulties. In the present work, oxygen exchange reaction rate between molten iron oxide and CO-CO2 gas has been measured by means of isotope exchange technique using C18O2-enriched CO2 gas. Isotope exchange technique is a useful method because the chemical reaction rate between gas and liquid phases could be measured directly without any influence of mass transfer in gas or liquid phases. The effects of temperature and CO2/CO ratio on the exchange rate have been investigated. It was clarified that the exchange rate was determined by interfacial reactions at first, and then by diffusion of 18O in liquid iron oxide.抄録全体を表示PDF形式でダウンロード (923K) -
奥野 昌二, 福尾 剛志, 荒川 隆一2005 年 53 巻 5 号 p. 265-269
発行日: 2005年
公開日: 2006/04/05
ジャーナル フリーDesorption/ionization on silicon (DIOS)-mass spectrometry of poly(ethylene glycol)s (PEG) were investigated using binary mixtures of NaI and other alkali metal iodides (LiI, KI, RbI, and CsI). A linear correlation was found between the relative ion intensities and the concentration ratios of the alkali metal ions. The smaller size metal ion adducts of PEG molecules were observed more intensively in the spectra. These results suggest that the interaction between PEG molecules and cationizing agents is important for the cationization of PEG molecules in DIOS.抄録全体を表示PDF形式でダウンロード (499K)
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