过氧化苯甲酰（BPO）作为面粉增白剂,过量添加会对人体造成危害。本实验随机抽查了新乡市5个面粉厂的50个样品,利用气相色谱法对过氧化苯甲酰的含量进行了检测，并证明了实验结果的准确可靠性；实验检测样品的不合格率为20%，依此，以95%的置信度推测到整个新乡市市售面粉中过氧化苯甲酰超标率在0~45.48%范围内。通过本实验，了解到了新乡市市售面粉中过氧化苯甲酰的使用情况，有利于今后在面粉生产过程中采取针对性的监督管理措施。

The benzoyl peroxide (BPO) is the whitening additive for wheat flour, but the excessive addition of BPO is harmful to human body.10 samples from 5 kings of wheat flour in Xinxiang city were stochastically selected for detection their BPO contents by the gas chromatography. It was found that 20% of the samples were unqualified with respect to the returns-ratio and the reproduction quality. The unqualified rate of wheat flour ranged from 0 to 45.48% estimated with 95% confidence. The achieved results favor the control and monitor of the BPO content of wheat flour in the Xinxiang city.