原子吸收光谱法测定石膏表面硬化剂中钙镁的含量

Determination of calcium and magnesium contents in gypsum surface hardening agent by atomic absorption spectrometry

利用火焰原子吸收光谱法测定了医用石膏表面硬化剂中钙镁的含量。测定前样品先经过湿消解法处理。钙在0.04～1.09μg/25mL范围内线性关系良好,r>0.997,RSD<0.25%,回收率为95.2%;镁在0.04～0.05μg/25mL范围内线性关系良好,r=0.9996,RSD=0.05%,回收率为103.38%。实验证明,此法简便、快速,结果准确,可用于其它医用材料微量元素的测定。

The contents of calcium and magnesium in gypsum surface hardening agent was determined by flame atomic absorptio spectrometry. Before determination samples were treated by wet digestion method. For calcium, the linear range is 0. 04-1.09 ug/25mL, r =0. 997, RSD=0.25%, and the recovery is 95.2%. For magnesium, the linear range is 0. 004-0.05ug/25mL, r =-0. 996, RSD=0.05%, and the recovery is 103.38%. The method is smple, fast and acurate, and can be used for the determination of trace elements in other medical materials.