Abstract: The traditional potassium permanganate titration method was usually adopted for the determination of Mn2+ in the lixvium from manganese ore. However, this method was greatly affected by Fe2+ in the lixvium. In this study, the interference of Fe2+ was eliminated by oxidization of hydrogen peroxide and complex of phosphoric acid in high-temperature. Then, the content of Mn2+ was determined by potassium periodate oxidization photometry. The results showed that, the linear range of modified determination method was 4-20 mg/L with correlation coefficient of R2=0.999 6. The coloring was stable within 90 min. The tolerant amount of Fe2+ was 10 g/L. This method could meet the actual determination requirements and was applied to the determination of two manganese ore lixvium, with relative standard deviation (RSD) of 0.6 % and 1.0 %, respectively. In addition, the relative error between determination results of this method and atomic absorption spectrometry was smaller than 3 %.
[3] 陈莹. 高碘酸钾氧化光度法快速测定锰电解液中含锰量[J]. 广西轻工业(Guangxi Journal of Light Industry),2007,(6):30.
[4] 周南. 锰的光度试剂综述(上)[J]. 上海化工(Shanghai Chemical Industry),2001,(13):21-23.
[5] 周南. 锰的光度试剂综述(下)[J]. 上海化工(Shanghai Chemical Industry),2001,(14):17-21.
[6] Hassouna M E M, Elsuccary S A A. Determination of oxalate based on its enhancing effect on the oxidation of MnⅡ by periodate[J]. Talanta,2002,(56):193-202.
[7] 孙瑞霞,董壮龙,孙剑辉. 溴甲酚绿为内标-甲醛肟光度法测定水体中锰的研究[J]. 分析试验室(Chinese Journal of Analysis Laboratory),2004,23(2):24-26.
[8] 王兰芝,佘远斌. 取代金属(铁、锰、钴、铜、锌)卟啉的光谱分析[J]. 光谱学与光谱分析(Spectroscopy and Spectral Analysis),2008,28(10):2312-2317.
[9] 李孟迪,薛秀玲. 高碘酸钾分光光度法测定水中锰Ⅱ的改进 [J]. 华侨大学学报:自然科学版(Journal of Huaqiao University: Natural Science),2012,33(2):176-178.
[11] 邢殿楼,王丽,杨凤,等. 用改进的高碘酸钾氧化分光光度法测定海水中的 MnⅡ[J].大连水产学院学报(Journal of Dalian Fisher IES University),2008,23(6):442-445.
[12] Mutaftchiev K. Determination of manganese in some medicinal plants and their infusions by a catalytic spectrophotometric method[J].Annali di Chimica,2004,94(11):829-836.
[13] Li Hua,Zhang Xinshen,Zou Yuquan,et al. Study on a new method for determining trace amounts of manganese Ⅱ in water by flow-injection catalytic kinetic spectrophotometry[J]. Spectroscopy and Spectral Analysis,2007,27(4):758-788.
[14] 尹海宁,翟盛宇. 高碘酸钾氧化比色法测定水中锰[J]. 预防医学文献信息(Liferatue and Information on Preventine Medicine),2002,8(2):199-200.