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抗坏血酸溶液的易氧化,主要是由于溶液中微量铜的存在。本刊一九七九年第五期第四十八页报导,在抗坏血酸溶液中加入少量EDTA(每升中加0.0372g,相当于1×10~(-4)M)可延长溶液的有效使用时间,我们把它用于抗坏血酸-铋盐钼蓝光度法测磷,取得了效果。抗坏血酸-铋盐钼蓝光度法测钢铁中的磷,各单位方法不尽相同。我们分析铸铁(含P<0.3%)一般每次吸取含试样25mg的溶液,加入抗坏血酸(0.4%)20ml。在这种溶液中加入EDTA(1×10~(-4)M)经过一个
Ascorbic acid solution easy oxidation, mainly due to the presence of trace amounts of copper in solution. This issue, Volume 5, 1979, p. 48, reports that the addition of a small amount of EDTA to ascorbic acid (0.0372 g per liter, equivalent to 1 × 10 -4 M) can prolong the effective use of the solution Time, we use it for phosphorus ascorbate - bismuth molybdenum blue photometry phosphorus, and achieved results. Ascorbic acid - bismuth salt molybdenum blue photometric method of measuring phosphorus in steel, the method of each unit is not the same. Our analysis of cast iron (containing P <0.3%) generally each containing 25mg sample solution, adding ascorbic acid (0.4%) 20ml. Add EDTA (1 × 10 -4 M) to this solution over one