本文介绍了我们自制的气体密度天平的结构,并考察了某些参数。推导出以外标组份为基准测定样品中组份的体积百分数计算公式,经实践证明此公式是正确的。介绍了气体密度天平用作火焰法制氢氰酸尾气和安氏法制氢氰酸反应气中 H_2,O_2,N_2,CH_4,CO 及 CO_2等永久性气体的分析使用情况。分析误差在2%以内,与化学吸收—体积色层法对照,相对误差在±5%以内。 This article describes the structure of our home-made gas density balance and examines certain parameters. The formula for calculating the volume percentage of the components in the sample based on the external standard component is derived. The formula is correct. The gas density balance was introduced for the analysis of permanent gases such as H_2, O_2, N_2, CH_4, CO and CO_2 in the tail gas of pyrometallurgy and the hydrogen cyanide gas of the Anschluss method. The analysis error is within 2%, and the relative error is within ± 5% as compared with the chemical absorption - volume chromatography method.