木耳又名黑木耳,是一种营养较丰富的食品。但是,近几年来,一些唯利是图的商贩为了牟取暴利,在木耳中掺伪现象较为普遍,我站查出一批木耳中掺尿素的样品。目前,尿素的测定方法以纳氏比色法、对二甲胺基苯甲醛比色法及次氯酸钠法等为常见。本文采用二乙酰一肟比色法测定木耳中尿素的含量,本方法依据的原理为,尿素与二乙酰一肟及安替比林反 A fungus, also known as black fungus, is a nutrient-rich food. However, in recent years, some mercenary traders in order to reap huge profits, adulterated in the fungus is more common, I found a group of station to check a group of mushrooms with urea-doped samples. At present, the urea determination method to Nessler colorimetric, dimethylaminobenzaldehyde colorimetry and sodium hypochlorite method is common. In this paper, diacetyl-oxime colorimetric determination of the content of urea in the fungus, the method based on the principle of urea and diacetyloxime and antipyrine anti