有機微量元素分析の誤差の研究 (第3報)

炭水素分析における誤差要因の研究 その2

抄録

In order to elucidate the cause of error in carbon and hydrogen determinations revealed by the previous work, studies were made based on the statistical design of experiment. The three factors, balance, analytical apparatus, and operator, were placed in a combination of 3-way layout of two levels each, the order of analysis in each combination was stratified into four portions, two operations were alloted to each, and a total of 64 experiments were designed. During the experiments, precaution was taken to collect the data at random and the experiments were carried out during continuous analyses of general assignment. Statistical analysis of the results revealed that, of the three factors, variation by the balance alone showed significant difference, and that the precision of analytical values was C 0.1844% and H 0.2034% at σ, much smaller than that of C=H 0.25% in the preceding report. These results indicate that the cause of error in elemental analyses is due almost entirely to the decreased precision of the balance.