家用微波炉的非均匀加热对所消解样品测定结果影响的研究

Effect of Non uniform Heating of Ordinary Microwave Oven upon the Determination Results of Sample Digested in the Oven

本文从微波加热的非均匀性出发，研究了微波炉（格兰仕ＷＰ７５０Ａ型）中转盘的不同位置上样品的受热差异，从中发现了在统计学上差异不具显著意义的各受热点间的分布规律；并就这些受热差异不具显著意义的各点，通过对标准参考物质ＧＢＷ０７２３３中的铜、ＮＩＥＳＳＲＭＮｏ．１中的铜和砷元素含量的实际测定（ＡＡＳ法）确认，样品不会因这些位置上温度的非显著性差异，而引致其测定结果上的精密度和准确度的降低。

This article studies the heating variation of the sample placed on various relative positions of the turning tray in the microwave oven cavity.We find the distribution regularity of heating points that are of insignificant variation statistically,and determine Cu content in the sample GBW07233 and Cu and As contents in the sample NIES SRM No 1 that are digested on these points.The determinations prove that the precision and accuracy of the determination results will not reduce,even though there are insignificant variations of temperature on these points.