离子色谱法测定肥料级硫酸铵中3种阴离子

Ion chromatography method for the determination of three anions in fertilizer-grade ammonium sulfate

摘要:

本研究成功开发了一种离子色谱法,用于检测肥料级硫酸铵中的氟离子、氯离子和硫氰根离子。由于样品中高浓度的硫酸根离子会对检测结果产生干扰,我们采用SPEIC-Ba离子小柱对样品进行了纯化处理。随后,利用SH-AP-1(5.5 μm, 4.0×250mm)色谱柱进行分离,并通过电导检测器进行检测,采用外标法进行定量分析。在方法开发过程中,我们重点优化了Ba柱的选择、色谱柱的选择以及样品的前处理,通过对方法的线性范围、检出限、定量限、准确度和精密度等关键指标进行系统评估,所有指标均达到预期标准。本研究所建立的方法为肥料级硫酸铵中氟离子、氯离子和硫氰根离子的监测提供了可靠的技术支持,对于保证肥料产品质量和安全具有重要意义。

Abstract:

This study successfully developed an ion chromatography method for the detection of fluoride ions, chloride ions, and thiocyanate ions in fertilizer-grade ammonium sulfate. Due to the interference caused by the high concentration of sulfate ions in the sample on the detection results, we used SPEIC-Ba ion columns to purify the sample. Subsequently, the SH-AP-1 (5.5 μm, 4.0×250mm) chromatographic column was used for separation, and the conductivity detector was used for detection, with external standard method for quantitative analysis. During the method development process, we focused on optimizing the selection of Ba columns, the selection of chromatographic columns, and sample pretreatment. By systematically evaluating key indicators such as the linear range, detection limit, quantitation limit, accuracy, and precision of the method, all indicators met the expected standards. The method established in this study provides reliable technical support for the monitoring of fluoride ions, chloride ions, and thiocyanate ions in fertilizer-grade ammonium sulfate, which is of great significance for ensuring the quality and safety of fertilizer products.