双通道离子色谱法测定一件陶罐表面结晶盐以及脱盐溶液中的阴阳离子

陶器由于受环境的影响,表面容易出现结晶盐。在保护修复陶器的过程中,脱盐是重要的保护程序之一。本工作主要研究了双通道离子色谱法测定一件陶罐表面结晶盐以及脱盐溶液中的7种阴离子和5种阳离子时,淋洗液浓度、流速对测定结果的影响。实验表明:淋洗液浓度和流速会影响各离子的分离和峰形。当碳酸钠~碳酸氢钠浓度为2.5~1.7mmol/L、流速为0.6m L/min,吡啶二羧酸~硝酸浓度为0.8~1.6mmol/L、流速为0.7m L/min时,各离子峰形好,分离时间适中,分离效果很好。精密度和回收率实验表明,该分析方法的准确度满足定量分析的要求。由此可见,用双通道离子色谱法可以快速、简便、准确地测定结晶盐的离子种类和含量,可以实时监测脱盐溶液中的离子含量能较好地反映器物的脱盐程度。

Determination of anions and cations in crystallized salts during desalination of pots using dual channel ion chromatography

Due to environmental influences, salts are prone to crystallize on the surfaces of pots. In the conservation of pots, desalination is one of most important treatments. In this study, the influence of various factors , such as eluent velocity and concentration, on the crystalline salt and the progress of desalination were analyzed by dual ion chromatography. These experiments showed that eluent velocity and concentration affect the separation of ions and shapes of the chromatography peaks. With Na₂CO₃~NaHCO₃ at a concentration of 2.5~1.7mmol/L and a flow rate of 0.6mL/min, or pyridinedicarboxylic acid~HNO₃ at 0.8~1.6 mmol/L and 0.7 mL/min, all ions show well separated peaks with good peak shapes. The standard curves were highly linear, reproducible, and precise with high correlation coefficients. Therefore, it can be concluded that dual channel ion chromatography is capable of detecting ions and giving concentration information. The method is proved to be quick, easy and accurate. The method can be used to monitor the desalination process.