原子吸收法和原子发射法测定奶粉中钠的比较

Comparison between Atomic Absorption Spectrometry and Atomic Emission Spectrometry on the Determination of Sodium in Milk Powder

根据GB5009中测定食品中钠的方法,在波长为330.2nm下分别用原子吸收法和原子发射法测定奶粉中钠的含量,并进行了2种方法的对比试验。结果表明,2种方法的灵敏度和检出限接近,吸收法灵敏度稍高。2种方法的精密度和准确度接近,均可满足日常食品检验的要求。2种方法的回收率在92%～102%之间,从整体看,原子吸收法略优于原子发射法。

According to the method determining sodium in food in GB 5009, the content of sodium in milk powder was determined by using atomic absorption spectrometry and atomic emission spectrometry at the wavelength of 330.2 nm, and two kinds of methods were compared. The result showed that the sensitivity and detection limit of 2 methods were close, with higher sensitivity of atomic absorption. The precision and accuracy of 2 methods were similar, which all could meet the daily requirements of food inspection. The recovery rate of 2 methods was in 92 %-102 %. On the whole, the method of atomic absorption spectrometry was slightly superior to that of the atomic emission spectrometry.