The validity of linearity of the calibration line in the determination of anions by ion chromatography with suppressed conductivity detection

SHIKAKUME Kazuhiro, YOKOYAMA Yukio, SATO Hisakuni

doi:10.2116/bunsekikagaku.52.297

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サプレッサー付電気伝導率検出方式陰イオンクロマトグラフィーにおける直線検量線の妥当性
サプレッサーツキデンキデンドウリツケンシュツホウシキインイオンクロマトグラフィーニオケルチョクセンケンリョウセンノダトウセイ

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Abstract

The linearity of the regression line for the calibration in anion determination by ion chromatography with a suppressed conductivity detector was studied both theoretically and experimentally. The relationships between the peak area and the concentration of standard solutions were obtained by equilibrium calculations for fluoride, chloride, nitrate and sulphate ions. Theoretical calculations assuming that the non-linearity of the calibration line can be attributed to a shift of the acid-base equilibrium of the solute and eluent ions are consistent with experimental data. Generally, the calibration line is not linear for the anions of a weak acid, such as fluoride ion. Some eluents, such as carbonate salt, give a curved regression line for any solute ions. For a high-precision calibration, the linear regression should be limited to a narrow concentration range because of the non-homogeneous precision of the conductivity measurement. The high order of the regression formula, if necessary, should be adjusted to the data group of the homogeneous precision. Numerical examples of the linear calibration range are shown for fluoride, chloride, nitrate and sulfate ions.<br>

Journal

BUNSEKI KAGAKU

BUNSEKI KAGAKU 52 (5), 297-304, 2003

The Japan Society for Analytical Chemistry

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