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Selective Peak Enhancement and Suppression in Conductometric Ion Chromatography and Its Application to the Determination of Trace Levels of Orthophosphate in Environmental Samples
- フォーマット:
- 論文
- 責任表示:
- Hayakawa, Kazuichi ; Kato, Akio ; Yamamoto, Atsushi ; Miyazaki, Motoichi
- 言語:
- 英語
- 出版情報:
- 日本分析化学会 = The Japan Society for Analytical Chemistry, 1992-01-01
- 著者名:
- 掲載情報:
- Analytical Sciences
- ISSN:
- 0910-6340
- 巻:
- 8
- 通号:
- 1
- 開始ページ:
- 25
- 終了ページ:
- 29
- バージョン:
- publisher
- 概要:
- In non-suppressed conductometric ion chromatography, when a carboxylic acid eluent of low pH is used, the signal intensity (ΔHc) is proportional to the sum of the conductivity change caused by changes in the sample concentration (ΔCs) as well as conductivity changes caused by changes in the eluent concentration (ΔCe). This can be expressed as ΔHC=B(ΔCs)+B(ΔCe), where B is a constant. In this equation, … ΔCs is constant for any sample species. However, ΔCe varies with changes in the sample capacity factors. This value is positive when the sample elutes before the system peak (k′s<k′e), and is negative when it elutes after the system peak (k′s>k′e). Therefore, the sample peak intensity (ΔHC) is enhanced prior to the system peak and is suppressed after it. These effects increase the closer the sample and the system peaks. The effect of this theory was proved by a determination of orthophosphate using a TSK gel IC-Anion-PW column and a 0.75mM phthalic acid eluent. The detection limit of this method for orthophosphate (1×10-11mol, with an S/N of three) was smaller (by a factor of 10-30) than those by previous conventional ion chromatographic methods. Also, the interference of chloride or nitrate, often observed in the previous methods, was removed by suppressing their peak intensities. When this method was applied for the determination of orthophosphate in environmental samples, other interfering compounds were effectively removed by a column-switching system attached to the ion chromatograph, and a trace level of the orthophosphate was determined. 続きを見る
- URL:
- http://hdl.handle.net/2297/44558
類似資料:
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
Japan Society for Analytical Chemistry = 日本分析化学会 |
3
論文
Simultaneous Determination of Organic Acids in Commercial Vinegar by Photometric Ion Chromatography
日本薬学会 = The Pharmaceutical Society of Japan |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本分析化学会 = The Japan Society for Analytical Chemistry |
日本薬学会 = The Pharmaceutical Society of Japan |