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(一)高镍合金钢中硼的测定在一般合金钢中测定酸溶性硼,采用硫酸溶样后直接用次甲基篮比色。但高镍(20～70%)高铬合金钢不溶于硫酸,故须用王水溶样。文献述及用硫磷酸冒烟赶去硝酸,然后用次甲基篮比色测定微量硼。本文对冒烟时的酸度,加热形成硼氟络离子,残渣处理,温度对吸光度的影响等方面进行了试验。证明温度高时硼氟络离子的形成时间可缩短为2分钟,镍基合金钢中总硼的测定,残渣无需另外处理,可直接冒烟后测定,成批试样可以同时进行,分析时间可缩短一半。且
(A) Determination of boron in high-nickel alloy steel Determination of acid-soluble boron in the general alloy steel, sulfuric acid samples were directly methylated basket colorimetric. However, high-nickel (20 ~ 70%) high-chromium alloy steel is not soluble in sulfuric acid, it is necessary to use aqua regia sample. The literature describes the use of thiophosphate smoke rushed to nitric acid, and then the use of methylamine basket colorimetric determination of trace boron. In this paper, the acidity during smoking, the formation of boron fluoride by heating, residue treatment, the influence of temperature on the absorbance were tested. It is proved that the formation time of borofluoride ion can be shortened to 2 minutes when the temperature is high, the determination of total boron in the nickel-based alloy steel, the residue can be measured directly after smoking, the batch sample can be carried out simultaneously, the analysis time can be Shortened by half. And