【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%。更多还原

【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 4-20mg/L with correlation coefficient of R2=0.999 6.The coloring was stable within 90 min.The tolerant amount of Fe2+ was 10g/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%.更多还原