在用硅钼蓝光度法测定高碳钢中硅时,特别是测定经退火处理的高碳钢中硅,试样溶解后,经稍长时间的煮沸,加入高锰酸钾进行慢氧化、再氧化的方法,可使溶液中的碳化物和游离碳完全被破坏,从而获得透明的溶液,而用过滤法有时得偏低结果。处理方法:试样于40ml硫酸溶液(3%)中,低温加热溶解后,煮沸5～15min,滴加高锰酸钾溶液(4%)至出现稳定的紫红 Silicon molybdenum blue spectrophotometric determination of high-carbon steel, especially the determination of the annealed high-carbon steel in silicon, the sample is dissolved, after a little boil for a long time, adding potassium permanganate slow oxidation, and then Oxidation of the solution, the solution of the carbide and free carbon completely destroyed, so as to obtain a transparent solution, and sometimes filtered by the results have been low. Treatment: sample in 40ml sulfuric acid solution (3%), low temperature heating dissolved, boiled 5 ~ 15min, dripping potassium permanganate solution (4%) to a stable purple