Study on Analytical Method of Element Impurity Magnesium in Montmorillonite

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.