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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Kovats retention index ： ウィキペディア英語版 Kovats retention index In gas chromatography, Kovats retention index (shorter Kovats index, retention index; plural retention indices) is used to convert retention times into system-independent constants. The index is named after the Hungarian-born Swiss chemist Ervin Kováts, who outlined this concept during the 1950s while performing research into the composition of the essential oils.〔(Institute of Chemical Sciences and Engineering, KOVATS Ervin, Prof. Hon. )〕 The retention index of a certain chemical compound is its retention time normalised to the retention times of adjacently eluting n-alkanes. While retention times vary with the individual chromatographic system (e.g. with regards to column length, film thickness, diameter, carrier gas velocity and pressure, and void time), the derived retention indices are quite independent of these parameters and allow comparing values measured by different analytical laboratories under varying conditions. Tables of retention indices can help identify components by comparing experimentally found retention indices with known values. 〔(Retention index guide )〕 ==Expression== The method takes advantage of the linear relationship between the values of $\backslash log\; (t\_r\text{'})$ and the number of carbon atoms in a molecule. The value of Kovats index is usually represented by ''I'' in mathematical expressions. Its applicability is restricted to organic compounds. For isothermal chromatography, the Kovats index is given by the equation $I\; =\; 100\; \backslash times\; \backslash left\; (n\; +\; \backslash frac\; \text{'})\; -\; \backslash log\; (t\_\; \text{'})\}\; \text{'})\}\; \backslash right)$ Where: $I\; =$ Kovats retention index, $n\; =$ the number of carbon atoms in the smaller n-alkane, $N\; =$ the number of carbon atoms in the larger n-alkane, $t\_r\text{'}\; =$ the adjusted retention time. For temperature programmed chromatography, the Kovats index is given by the equation $I\; =\; 100\; \backslash times\; \backslash left\; (n\; +\; \backslash frac\; -\; t\_\; \}\; \}\; \backslash right)$ Where: $I\; =$ Kovats retention index, $n\; =$ the number of carbon atoms in the smaller n-alkane, $N\; =$ the number of carbon atoms in the larger n-alkane, $t\_r\; =$ the retention time. 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「Kovats retention index」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.