氯磺酚S曾用于铌、锆、钼、钨、铝等元素的光度法测定。据文献报导,氯磺酚S在0.25N盐酸(或硫酸)介质中,与钼形成1:1的络合物,且在EDTA存在下,可用于锆、钨、铀等合金中钼的测定。本文研究了氯磺酚S和钼的显色反应。在抗坏血酸存在下,可直接用于钢铁中钼的光度法测定.一般钢铁中常见元素基本上不干扰. Chlorosulfonol S has been used for niobium, zirconium, molybdenum, tungsten, aluminum and other elements of the spectrophotometric determination. It has been reported in the literature that chlorosulfonamide S forms a 1: 1 complex with molybdenum in 0.25 N hydrochloric acid (or sulfuric acid) medium and can be used for the determination of molybdenum in alloys such as zirconium, tungsten and uranium in the presence of EDTA. In this paper, the color reaction of chlorosulfonates S and molybdenum was studied. In the presence of ascorbic acid, it can be directly used for the determination of molybdenum in steel.Generally, common elements in steel generally do not disturb.