润滑剂在黄铜管热处理过程中的分解可能在管内壁形成碳膜,其结果是使铜管抗腐蚀性能变差并易断裂。因此铜管表面含碳的问题已普遍引起生产和使用部门的重视。H.S.Campball用硝酸把铜管表面部分溶解,滤出残渣后用燃烧法测定铜管内壁残碳量。此法操作麻烦,灵敏度差。运用非水定碳法虽能提高分析速度,但灵敏度不能令人满意。我们用高频加热氧化-气相色谱法测定了黄铜管表面碳含量。本法特点是通过特殊设计的发热体使样 The decomposition of the lubricant during the heat treatment of the brass tube may form a carbon film on the inner wall of the tube. As a result, the corrosion resistance of the copper tube is deteriorated and it is easily broken. Therefore, the problem of carbon content on the copper surface has generally caused the production and use of the department’s attention. H.S.Campball use nitric acid to partially dissolve the surface of the copper tube, and then determine the amount of residual carbon in the inner wall of the copper tube by filtration after filtering off the residue. This method is cumbersome to operate and has poor sensitivity. The use of non-aqueous carbon method can improve the analysis speed, but the sensitivity is not satisfactory. We measured the carbon content of the brass tube by high frequency heating oxidation-gas chromatography. The law is characterized by a special design of the heating element to make samples