一、绪言我广合金钢材的化验量甚大,特别是钼,如果不采用光电比色法而用重量法测定钼,势难满足生产需要。我们一直采用硫氰酸钠——光电比色法。先用“卡皮托”(注1)有机溶剂作稳定剂,但因价较贵,不易买到质量好的“卡皮托”,而且色泽的稳定性又不够理想。改用过氯酸后,发现所测得的结果有偏高现象。特别是在含钼量低时比较严重,最高达0.05%之多;但在高含量时(超过 I. INTRODUCTION I widely test a large amount of alloy steel, especially molybdenum, if you do not use photoelectric colorimetric gravimetric determination of molybdenum, the situation is difficult to meet the production needs. We have been using sodium thiocyanate - photoelectric colorimetry. The first use of “Capito” (Note 1) organic solvents as a stabilizer, but due to the price is more expensive, not easy to buy good quality “Capito”, and the color stability is not ideal. Switch to perchloric acid and found that the measured results are high. Especially in the low molybdenum content is more serious, up to 0.05% as much; but at high levels (more than