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作为容量分析的常用强氧化剂——高锰酸钾溶液的标定,长期以来都用草酸钠作基准物质。但迄今为止,这一标定方法始终难以避免符号为正的误差。麦克白拉德(R.S.McBride)曾建议在加热到80～90℃酸化的草酸盐溶液中进行滴定,柯尔蜀夫(I.M.Kolthoff)则建议为75～85℃。其后,福勒(R.M.Fowler)等采用低温一次加入90%高锰酸钾待标溶液并在加热情况下完成滴定的方法。柯尔蜀夫等曾对上述三种方法进行比较和评价。他俩认为;对于标定0.1N高锰酸钾溶液来说,如以碘化钾电位滴定法测出的高锰酸钾当量浓度为准确值,那么上述三种
As a common strong oxidant for capacity analysis, the calibration of potassium permanganate solution has long used sodium oxalate as a reference material. However, so far, this calibration method has always been difficult to avoid the sign of positive error. R.S. McBride has recommended titration in acidified oxalate solutions heated to 80-90 ° C, recommended by I. M. Kolthoff at 75-85 ° C. Thereafter, R.M. Fowler et al. Adopted a method of adding 90% potassium permanganate in a single low temperature and completing the titration under heating. Kohl Shufu et al. Have compared and evaluated the above three methods. They think; for the calibration of 0.1N potassium permanganate solution, such as potassium iodide potentiometric titration to determine the equivalent concentration of potassium permanganate, then the three