Development of a future potential primary direct method for quantifying paramagnetic substances

点击翻译按钮获取中文摘要

Such as coulometry, gravimetry and freezing point depression method, 'primary direct methods of measurement for the amount of substance' plays an important role in both analytical chemistry and chemical metrology. These primary direct methods can measure purities of various chemicals. We have developed a quantitative magnetic analytical method using Curie-Weiss law for future potential primary direct method to quantify atoms with unpaired electrons in diamagnetic matrix. For the experimental validation of principle of this analytical method, powder mixture samples of gadolinium oxide and silicon oxide and three high-purity organic compounds with free radicals were quantified. As the results, this magnetic analytical method successfully quantified the gadolinium ion or stable nitroxyl radicals, although the relative uncertainty of analytical values were approximately 5%.