書誌事項
- タイトル別名
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- Measurement of Acidity of Magnesium Salts-Silica Gel Composites by Microscopic Absorption Spectrometry Using Porphyrin as pH-indicator
- ポルフィリン オ pH シジヤク ニ モチイル ケンビキュウコウ コウド ブンセキ ニ ヨル マグネシウムエン-シリカゲル フクゴウ コタイ ノ サンセイド ソクテイ
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The acidity of magnesium salts-silica gel composites was measured by absorption spectrophotometry in the micro-region using a confocal laser scanning microscope (CLSM). It has been reported that MgCl2-SiO2 releases protons under dry conditions, and goes back to neutral under wet conditions. At first, using five kinds of tetraarylporphyrins, the absorbance (AP) at 515 nm due to a free base type and that (AG) at 650 nm due to the protonated porphyrins were measured in a CHCl3-MeOH-water solution, whose apparent pH was adjusted by HClO4. Fraction (F-value) of AP [F = AP/(AG + AP)] was calculated at every apparent pH to produce apparent pH-profiles of the F-values for all porphyrins. The profiles were fitted by sigmoid curves. Second, the porphyrin was adsorbed on MgCl2-SiO2. The porphyrin-adsorbed composite was kept under the given relative humidity conditions for 3 days and subjected to CLSM analysis. The F-values of the porphyrins adsorbed on the composites were obtained from the absorption spectra to determine the apparent pH using fitting curves. As a result, the MgCl2-SiO2 had an apparent pH of 1.73 under dry conditions, and 4.39 under wet conditions. Moreover, the pH values of the Mg(NO3)2-SiO2 composite and the MgSO4-SiO2 composite were measured.
収録刊行物
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- 分析化学
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分析化学 61 (10), 851-856, 2012
公益社団法人 日本分析化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679636890112
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- NII論文ID
- 130001886961
- 10030877512
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- NII書誌ID
- AN00222633
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- COI
- 1:CAS:528:DC%2BC38Xhs1ektrfF
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- NDL書誌ID
- 024036042
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- ISSN
- 05251931
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
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- 抄録ライセンスフラグ
- 使用不可