“燃烧热测定”实验的改进

改进燃烧热测定实验的点火丝的安装方式为粗纺棉线压入式。与传统的点火丝埋入式方式相比,实验成功率提高了23%。以苯甲酸为标准物,考察了四种不同面粉为待测物的燃烧热的测定实验的可行性。结果表明,面粉价廉易得,无污染,易于压片成型,燃烧后无任何残留,热值平均相对标准偏差(RSD)为3.2%,是适宜的"燃烧热的测定"实验的待测物质。

The method of measuring heat of combustion has been improved by changing means of pressing the cotton in sample. The re-sults showed that the experimental success rate increased by 23% compared with the traditional method. Four kinds of flour was taken as the determinand in the test of combustion heat. The results showed that the relative standard deviation （RSD） of 3.2% and flour is suitable for the determination due to its cheap, environment protection and easy to forming.