吸光度定位光度法测定锰铁中的锰

Determination of Manganese in Ferromanganese by Absorbance Positioning Spectrophotometry

摘要: 在“保持‘人、机、料、法、环’各个影响因素在同批样品测定中同一性”的条件下：1) 制备一个标准样品的“母液”；2) 以“微滴”方式滴取“母液”制备“显色系列”，展现其吸光度值域区间；3) 将被测样品的最高含量匹配吸光度最大值，组建“显色系列”相应的“含量系列”；4) 根据被测样品含量范围，选取“含量系列”中的两个样品，作为“两标准光度法”的两个标准。以其含量最高样品的“母液”用量为准，滴取被测样品的“母液”，作为被测样品并实施测定。此方法简便、高速、高效、环保。“小样本”测定结果的极差R为0.92%，不确定度U₉₅为0.22% (k = 3)，相对标准偏差RSD为0.28% (n = 8)。

Abstract: Under the condition of “maintaining the consistency of various influencing factors of ‘human, machine, material, method, and environment’” in the determination of the same batch of samples: 1) Prepare a “mother liquor” for a standard sample; 2) Drip the “mother liquor” in a “droplet” manner to prepare a “color series” and display its absorbance range; 3) Match the highest content of the tested sample with the maximum absorbance value, and form a “content series” corresponding to the “color series”; 4) Based on the content range of the tested sample, select two samples from the “content series” as the two standards for the “two standard photometry method”. Based on the amount of “mother liquor” used in the sample with the highest content, drop the “mother liquor” of the tested sample as the tested sample and carry out the measurement. The method is simple, fast, efficient, and environmentally friendly. The range R of the “small sample” measurement results is 0.92%, the uncertainty U₉₅ is 0.22% (k = 3), and the relative standard deviation RSD is 0.28% (n = 8).