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| 1.
論文 |
論文
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Nishimura, Masayuki ; Hayashi, Morimasa ; Hayakawa, Kazuichi ; Miyazaki, Motoichi
概要:
The selective effect of triethylenetetramine (Trien) on the retention behavior of sulfate in ion chromatography was stud
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ied. When Trien was added to an eluant as a counter ion, retention of sulfate was selectively shortened, while retention times of monovalent anions did not change. The cause for this phenomenon was the complexation of sulfate and Trien in an eluant. The stability constants of divalent sulfate-trivalent Trien and -tetravalent Trien complexes were estimated to be 936 and 4213 (40°C), respectively. As a practical application of this phenomenon, weakly retained monovalent species can be very well separated from both water dip and other species without prolonging the interval of injections.
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| 2.
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論文
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Nishimura, Masayuki ; Hayashi, Morimasa ; Yamamoto, Atsushi ; Hayakawa, Kazuichi ; Miyazaki, Motoichi
概要:
The effect of a mobile phase polyvalent counter ion on the retention behavior and peak intensity of sulfate in non- suppressed ion chromatography was quantitatively studied using a chromatogram simulation method. In this study,
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both indirect photometric detection (IPD) method and conductometric detection (CD) method were evaluated. With the IPD method, the retention of sulfate was observed to decrease in the presence of the polyvalent counter ion (Trien) without any change in peak intensity. With the CD method, however, peak intensity of sulfate decreased and, under some conditions, gave a negative peak in simulation as was also observed in actual experiments. The present work demonstrates the possibility of predicting the effect of a polyvalent counter ion on sulfate retention without resorting to physical experiments.
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| 3.
論文 |
論文
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平山, 直樹
概要:
金沢大学理工研究域<br />Relationships between ion-chromatographic retention behaviors of several anions and their dissociation co
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nstants were studied from two standpoints. In Part 1,the influence of the dissociation equilibria on the measured capacity factor of a sample was interpreted. In this study, the ratio of the capacity factor of the sample to that of a standard anion was used for the analysis of the retention behavior. The dissociation constants and the ratio of the capacity factors of various species of the sample to that of the standard were calculated and the retention behavior was estimated. In Part 2,the differences in the retention times of substituted benzoate anions having similar structure were analyzed by dividing the substituent effect into an LFER-applicable effect term, a steric effect term and a positional effect correction term. The first was introduced by putting the theory of linear free energy relationships into the relationship between the anion-exchange equilibria and the dissociation equilibria. The second depends on kind and number of the introduced substituents, and the last on the position of them. Furthermore, the estimation of the retention times of these anions and the determination of the dissociation constants of substituted naphthoic acids were done.
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