煤中氢的测定过去一般采用重量法,即试样在氧气流中加热使氢生成水蒸汽,用无水氯化钙或浓硫酸吸收。此法不仅费时,而且硫有干扰,影响分析结果。而氧的测定采用差减法和重量法。差减法不能得到准确结果。重量法手续烦琐、分析速度慢,且在氧化铜将一氧化碳氧化为二氧化碳和二氧化碳 Determination of hydrogen in the past, the gravimetric method used in the past, that is, the sample heated in the oxygen stream to generate hydrogen steam, with anhydrous calcium chloride or concentrated sulfuric acid absorption. This method is not only time-consuming, but sulfur interference, the impact of the analysis results. The determination of oxygen using differential subtraction and gravimetric method. Subtraction method can not get accurate results. Gravimetric procedures cumbersome, slow analysis, and oxidation of carbon monoxide in copper oxide to carbon dioxide and carbon dioxide