在原子吸收分析中多数场合用乙炔作燃气。目前国内除一部分单位有条件使用钢瓶乙炔气外,绝大多数单位需用电石水解制造乙炔气。自制乙炔中常含有磷化氢、硫化氢、氨、甲烷、硅化氢、氢、氧化钙微粒以及水蒸气等杂质。这些杂质绝大多数可经水洗除掉,余者主 In the atomic absorption analysis of most occasions with acetylene gas. At present, with the exception of some domestic units that use acetylene gas under the condition of cylinders, the vast majority of units need acetylene gas to be hydrolyzed by calcium carbide. Homemade acetylene often contains phosphine, hydrogen sulfide, ammonia, methane, hydrogen sulfide, hydrogen, calcium oxide particles and water vapor and other impurities. The vast majority of these impurities can be washed away, the rest of the Lord