火焰原子吸收法测定蒙古奶茶中的钙、镁、锌

Determination of Calcium,Magnesium,Zinc in Mongolian milk by flame atomic absorption spectrometry

用火焰原子吸收光谱法(FAAS)测定蒙古奶茶中的微量元素钙、镁、锌。对测定条件、干扰因素、准确度和精密度进行了考察。用灰化法处理蒙古奶茶。对3种元素进行测定,结果表明,吸光度与浓度之间呈良好线性关系,钙、镁、锌回归方程分别为:A=0.1334C+0.0025(R2=0.9993),A=0.4838C+0.0311(R2=0.9998),A=0.2149C+0.0224(R2=0.9997)。3种不同的蒙古奶茶中的钙、镁、锌测定结果的RSD值均小于1.25%,回收率在95.0%～105.0%。

The determination of trace elements in the Mongolian milk tea, such as Calcium, Magnesium and Zinc, was performed by flame atomic absorption spectrometry. The operation conditions were optimized. The Mongolian milk tea was treated by ashing method before determination. The results show that, there is a good linear relationship between the absorbance and concentration of trace elements. The regression equations of Calcium, Magnesium and Zinc are A = 0. 1334C ＋ 0. 0025 （ R2 = 0. 9993 ）, A = 0. 4838C ＋ 0. 0311 （ R^2 = 0. 9998 ）, A - 0. 2149C ＋ 0. 0224 （ R^2 = 0. 9997 ）, respectively. The determination of Calcium, Magnesium and Zinc in three different Mongolian milk teas is carried out. Their RSD values are all lower than 1.25% and the recovery is around 95.0% - 105.0%.