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[目的]建立检测纸制品中滑石粉的原子吸收分光光度法。[方法]样品干法消解后,用硝酸-氢氟酸溶解残渣,采用原子吸收光谱法测定其中镁的含量,扣除本底镁后换算成滑石粉的含量。[结果]方法的线性范围为0.01~1.0mg/L(r=0.998),检出限为0.001mg/L。样品测定的相对标准偏差(Relativestandard derivation,RSD)在0.8%～1.0%之间,加标回收率为95.7%～104.5%。[结论]该方法简便、快速,适用于纸制品中滑石粉的测定。
[Objective] To establish an atomic absorption spectrophotometric method for the determination of talc in paper products. [Method] After the sample was dry digested, the residue was dissolved with nitric acid - hydrofluoric acid, the content of magnesium was determined by atomic absorption spectrometry, and the content of magnesium was calculated as the content of talc after deducting the background magnesium. [Result] The linear range of the method was 0.01-1.0 mg / L (r = 0.998) with the detection limit of 0.001 mg / L. The relative standard deviation (RSD) of the samples was between 0.8% and 1.0%, and the recoveries were 95.7% ~ 104.5%. [Conclusion] The method is simple and rapid and suitable for the determination of talc in paper products.