本文试验了用燃烧高锰酸钾退色光度法测定钢铁中硫,准确度和再现性均好,方法简单,如果将吸收杯设计为比色皿,并与光度计配合,便可直接测出吸光度。试样在高温下通入氧气燃烧,生成的二氧化硫通入酸性KMnO_4吸收液中,使紫色的MnO_4~-被还原为无色的Mn~(2+),借此进行硫的测定。适用含量范围为0.002～0.04%。一试剂 This paper tested the combustion of potassium permanganate fading spectrophotometric determination of sulfur in steel, accuracy and reproducibility are good, the method is simple, if the absorption cup is designed as a cuvette, and with the photometer, you can directly measure the absorbance . The sample is passed at high temperature and oxygen is burned. The generated sulfur dioxide passes into the acid KMnO_4 absorption liquid to reduce the purple MnO_4 ~ - to colorless Mn_ (2+), thereby measuring sulfur. Applicable range of content is 0.002 ~ 0.04%. A reagent