直接分光光度法测定高铁酸盐的含量

Determination of ferrate content by direct spectrophotometry

采用直接分光光度法对高铁酸盐含量进行了研究,改进了高铁酸盐溶液的预处理方法,考察了影响高铁酸盐溶液稳定性和测定结果的主要因素,如高铁酸盐溶液的pH、溶剂和溶液温度等。结果表明,采用G4型玻璃砂芯漏斗过滤法对高铁酸盐溶液预处理后,用质量分数为2%的次氯酸钾溶液为稀释溶剂,当温度低于20℃时,在其最大吸收波长505 nm处测定,可以获得准确的测定结果。

Determination of ferrate content by direct spectrophotometry was studied. Pretreatment method for ferrate solution was improved. Major factors, such as pH of ferrate solution, solvent, and solution temperature, influencing the stablity of ferrate solution and determination accuracy were investigated. Results showed that accurate result could be determined when adopting filtration method with G4 sintered glass funnel to pretreat ferrate solution,using 2% （ mass fraction） potas - sium hypoehlorite as thinner, at the temperature below 20 ℃ , and at the maximum absorptive wavelength of 505 nm.