高碘酸钾氧化光度法测定含大量铁(Ⅱ)的锰矿浸出液中锰  

Determination of manganese in manganese ore lixivium with larger amounts of iron(Ⅱ) by potassium periodate oxidation photometry

作　　者：周伟[1] 张楠[1] 赵祝鹏[1] 张永奎[1] 陈华强 罗洪涛 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川会理铅锌股份有限公司,四川会理615105

出　　处：《冶金分析》2013年第2期47-50,共4页Metallurgical Analysis

摘　　要：锰矿浸出液中Mn2+的测定常采用传统高锰酸钾滴定法,但此方法受浸出液中Fe2+的影响较大。本文提出先用过氧化氢氧化及磷酸的高温络合方法排除Fe2+干扰,再用高碘酸钾氧化分光光度法测定Mn2+浓度的方法。结果表明:改进后测定方法的线性范围是4～20mg/L,相关系数为R2=0.999 6,在90min内显色稳定,允许Fe2+离子的最大含量为10g/L,能满足实际测定的需要。采用本方法测定两个锰矿浸出液,相对标准偏差(RSD)分别为0.6%和1.0%,且本法测定结果与原子吸收光谱法测定结果的相对误差小于3%。The traditional potassium permanganate titration method was usually adopted for the deter mination of Mn2＋ in the lixvium from manganese ore. However, this method was greatly affected by Fe2＋ n 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 deter- mined 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 R^2 =0. 999 6. The col- oring 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 er- ror between determination results of this method and atomic absorption spectrometry was smaller than 3%.

关 键 词：锰矿浸出液 锰(Ⅱ) 光度法 高碘酸钾 

分 类 号：O657.32[理学—分析化学]