采用汞盐和３种无汞盐重铬酸钾法进行实验比较研究，所得数据用单因素方差分析和多重比较法进行统计处理，表明在准确度方面各方法无显著差异，研究表明，采用铝粉还原法更简单． Mercury salt and three kinds of mercury-free potassium dichromate method were used for experimental comparison. The data were statistically analyzed by one-way ANOVA and multiple comparison method. The results showed that there was no significant difference in accuracy between the two methods. Powder reduction method is more simple.