高纯氨中金属颗粒杂质检测方法

通过蒸发捕集法与溶液吸收法两种前处理方法,利用高分辨电感耦合等离子体质谱对高纯氨中痕量金属杂质进行上机检测。实验表明,双聚焦磁质谱对稀氨水中金属杂质方法检出限低达10-12级,对高纯氨中金属杂质方法检测限低于1×10-9 m/m。方法便捷、准确,容易避免前处理污染,可以作为高纯氨中金属杂质检测的有效手段。

Determination of metal impurity in high purityammonia

By means of evaporation capture method and solutionabsorption method, the project take advantage of high resolution ICPMSto detect metal impurities in high purity ammonia. Experimentalresults show that LOD of most metallic element in diluted ammoniawater will achieve 10-12 level by means of sector field spectrometer,accordingly it can be as low as 1×10-9 m/m in high purity ammonia. Themethod is convenient, accurate and easy to avoid the pollution caused bypretreatment, therefore it can be used for detecting metal impurities inhigh purity ammonia.