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钢铁中硫的测定,国内外普遍采用燃烧—碘量法,此法简便快速,但硫的回收率都小于90%,必须依靠同类标样作基准进行换算.还原—次乙基篮分光光度法比传统的还原次甲基蓝分光光度法灵敏,次乙基蓝法的摩尔吸光系数比次甲基蓝法高2倍,因而它能将微量硫的测定下限1×10~(-3)%(指还原次甲基蓝光度法)扩大到5×10~(-4)%.一、试剂:N,N-二乙基对苯二胺硫酸盐(DEPD)溶液(0.5%),称0.5克试剂溶于100毫升5.4N硫酸中,摇匀.二、分析步骤:称取0.1000～0.5000克样品于100毫升磨口锥形瓶中,缓慢加入5～
Determination of sulfur in steel, the widespread use of domestic and foreign combustion - iodine method, this method is simple and fast, but the sulfur recovery rate of less than 90%, must rely on the same standard sample as a benchmark for conversion.Reversion - ethyl basket spectrophotometry Compared with the traditional method of reduction of methyl blue, the molar absorption coefficient of ethyl-ethyl blue is 2 times higher than that of methylene blue, so it can lower the determination limit of trace sulfur by 1 × 10 -3% (Referring to the reduction of methine blue) to 5 × 10 -4% I. Reagent: 0.5% N, N-diethyl-p-phenylenediamine sulfonate (DEPD) Grams of reagent dissolved in 100 ml 5.4N sulfuric acid, shake two, analysis steps: Weigh 0.1000 ~ 0.5000 grams of samples in 100 ml mill mouth Erlenmeyer flask slowly added 5 ~