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采用王水湿式消化处理样品,建立了ICP-AES法同时测定霍加拉特剂中Mn、Cu、Na、Al、Ca、Mg和Fe等7种金属元素的方法。通过谱线选择、条件优化和基体匹配等方法消除元素间干扰和基体效应,探讨了酸类型及酸度值对谱线强度的影响,研究了溶液浓度对精密度及线性相关系数的影响。方法的线性相关系数均大于0.999,Mn、Cu、Na、Al、Ca、Mg和Fe的最佳谱线分别为Mn257.610nm、Cu327.393nm、Na589.592nm、Al396.153nm、Ca317.933nm、Mg285.213nm、Fe238.204nm,相应的检出限分别为0.0008、0.0009、0.012、0.028、0.010、0.001、0.004μg/mL,对应测定值的相对标准偏差分别为0.34%、0.87%、0.87%、0.54%、0.48%、0.84%、0.55%,加标回收率为94.2%～104.4%。该方法简便、快捷、准确,可在测定其他催化剂中金属含量时推广应用。
The method of simultaneous determination of seven metal elements Mn, Cu, Na, Al, Ca, Mg and Fe in the geopolymer by inductively coupled plasma-atomic emission spectrometry (ICP-AES) The influence of acid type and acidity on the line intensity was discussed by the methods of spectrum selection, condition optimization and substrate matching, and the effects of solution concentration on the precision and linear correlation coefficient were studied. The linear correlation coefficients were all above 0.999. The optimal spectral lines of Mn, Cu, Na, Al, Ca, Mg and Fe were Mn257.610nm, Cu327.393nm, Na589.592nm, Al396.153nm, Ca317.933nm, Mg285 .213nm, Fe238.204nm, the corresponding detection limits were 0.0008,0.0009,0.012,0.028,0.010,0.001,0.004μg / mL, the corresponding standard deviation of the measured values were 0.34%, 0.87%, 0.87%, 0.54 %, 0.48%, 0.84%, 0.55% respectively. The recoveries of standard addition ranged from 94.2% to 104.4%. The method is simple, rapid and accurate and can be applied in the determination of metal content in other catalysts.