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先将洛阳第一拖拉机制造厂铸钢试验科同志给本刊编辑部的来信摘录如下。“用硝酸溶样、氟化钠-氯化亚锡还原磷钼蓝比色法并没有加入盐酸;但有关的反应式中却有4个HCl: (NH_4)_3H_4[P(Mo_22O_7)_6]+2SnCl_2+4HCl→冯难虎编的《钢的快速分析》,沪东造船厂质量检验组编的《金属的化学分析》和鞍钢的《钢铁厂化验工读本》都是这样写的。百思不得其解,希望贵刊能辟一专栏予以解答,以便指导日常的工作科学地而不是盲目地
The first Luoyang First Tractor Manufacturing Plant Steel Test Division comrades to the editorial department of the following extract from the letter. ”With the sample solution of nitric acid, sodium fluoride - stannous chloride reduction phosphomolybdate blue colorimetric method did not add hydrochloric acid; but the reaction has four HCl: (NH_4) _3H_4 [P (Mo_22O_7) _6] + 2SnCl_2 + 4HCl → Quick Steel Analysis by Feng Tihu, Chemical Analysis of Metals by Hudong Shipyard Quality Inspection Team, and Iron Steel Chemical Laboratory Reader by Anshan Iron and Steel Institute. Solution, I hope your magazine can provide a column to answer, in order to guide the daily work scientifically rather than blindly