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在非水滴定的基础上,用百里酚蓝的丙酮-甲醇溶液,试验了非水比色测定微量碳的方法。可以测定纯砷中2—14微克碳,变异系数6.12％。与气相色谱定碳法相比,结果相符,操作简单、成本低廉。试验部分测定装置及试剂: 吸收溶液:于贮液瓶中加入800毫升丙酮、200毫升甲醇、40毫克百里酚蓝、0.28毫升氢氧化钾溶液(7％),摇匀。返复滴加盐酸(5+95)或氢氧化钾溶液(3％),至吸收二氧化碳后
On the basis of non-aqueous titration, the method of non-aqueous colorimetric determination of trace carbon with acetone-methanol solution of thymol blue was tested. 2-14 μg of carbon in pure arsenic can be measured with a coefficient of variation of 6.12%. Compared with the GC method, the results are consistent with simple operation and low cost. Test section Assay apparatus and reagents: Absorption solution: 800 ml of acetone, 200 ml of methanol, 40 mg of thymol blue and 0.28 ml of potassium hydroxide solution (7%) were added to the stock solution and shaken well. After the return of hydrochloric acid (5 95) or potassium hydroxide solution (3%), to absorb carbon dioxide