The Willis method and conventional Kjeldahl method are compared by analyzing total Kjeldahl nitrogen in egg yolk pow der, milk powder and soybean. There are no difference between the two results.

• 还应用 Willis比色法与凯氏定氮法同时测定了蛋黄粉、奶粉和大豆中的氮含量，试验表明两方法测定结果差异不显著。