用离子色谱法定量测定电镀抛光液中的柠檬酸

Determination of Citric Acid in Electropolishing Solution by Ion Chromatography

研究用离子色谱法对电镀抛光液中柠檬酸的测定方法，选择合适的分离条件，使电镀抛光液中磷酸、硫酸和柠檬酸得到很好的分离。研究其它酸对柠檬酸的影响，进行实际电镀抛光液中柠檬酸含量的测定。

In this paper the quantitative method for citric acid in electropolishing solution by ion chromatography is described. The electropolishing solution contains phosphoric acid, sulphuric acis, citric acid and other organic compounds. Shim pack IC A1 anion exchange column (100 mm×4 mm) was used for separation of the acids. The mobile phase was a mixture of phthaiic acid (2 mmol/L) and tri(hydroxy methyl) aminomethane (2 mmole/L). Column temperature was at 40℃. Organic acids and inorganic acids were separated completely by this system. The effect of other acids on the determination of citric acid has been studied. Phosphoric acid and sulphuric acid did not affect the determination of citric acid. Several samples were analyzed by this method. Good results have been obtained.