蒙脱石中元素杂质镁的分析方法研究

Study on Analytical Method of Element Impurity Magnesium in Montmorillonite

关键词:  蒙脱石  镁  原子吸收分光光度法(AAS)  电感耦合等离子体质谱法(ICP-MS)

Key words:  montmorillonite  magnesium  atomic absorption spectrophotometry(AAS)  inductively coupled plasma mass spectrometry(ICP-MS)

摘要:

目的 建立一种能准确测定蒙脱石中金属元素杂质镁的检测方法。方法 分别用消解法、仿生胃液法前处理蒙脱石，再分别用原子吸收分光光度法（AAS）、电感耦合等离子体质谱法（ICP-MS）检测2种前处理方法得到的样品。结果 仿生胃液法前处理蒙脱石，镁元素的释放度低于消解法。消解法前处理蒙脱石，AAS测定结果与ICP-MS测定结果基本一致，比值为103.71%。仿生胃液法前处理蒙脱石，AAS测定结果略低于ICP-MS测定结果，比值为73.26%。结论 从经济、环保角度考虑，可采用仿生胃液法联合AAS测定蒙脱石中镁含量。

Abstract:

OBJECTIVE To establish a method for the accurate determination of metal element impurity magnesium in montmorillonite. METHODS The montmorillonite was pretreated by digestion method and biomimetic gastric juice method respectively. The samples obtained by two pretreatment methods were detected by atomic absorption spectrophotometry(AAS) and inductively coupled plasma mass spectrometry(ICP-MS). RESULTS The pretreatment of the montmorillonite by the biomimetic gastric juice method showed that the release of magnesium was lower than that of the digestion method. The montmorillonite was pretreated by digestion method, and the results of AAS determination were basically consistent with those of ICP-MS, and the ratio was 103.71%. The pretreatment of montmorillonite by bionic gastric juice method showed that the AAS measurement result was slightly lower than that of ICP-MS, and the ratio was 73.26%. CONCLUSION From the perspective of economy and environmental protection, the magnesium content of montmorillonite can be determined by biomimetic gastric juice method combined with AAS.