邻菲罗啉示差分光光度法测定铁矿石中全铁含量  

Measurement of Total Iron Content in Iron Ore by Phenanthroline Spectrophotometry

作　　者：吴永明 陶武[1] 黄飞雪 陈学娟 钟广蓉[1] 

机构地区：[1]北京科技大学化学分析中心

出　　处：《化学试剂》2018年第1期45-48,共4页Chemical Reagents

基　　金：国家自然科学基金资助项目(21576023)

摘　　要：选择了4个铁矿石标样,分别用三氯化钛还原重铬酸钾滴定和邻菲罗啉示差分光光度法测定其中的全铁含量。加入5 mL（15 g/L）抗坏血酸和5 mL（6 g/L）邻菲罗啉溶液,以0.6 mg Fe作为参比,测定铁溶液的吸光度,绘制工作曲线。结果显示,Fe的含量在0.8-1.6 mg时,其Fe的质量与吸光度之间具有很好的线性关系。在此条件下,对4个铁矿石标样作了6次平行测定,测定结果与标准值误差较小,RSD〈0.92%（n=6）,加标回收率为91.0%-107%。通过F检验和t检验得知,测得结果与标准值间不存在显著性差异,该方法与三氯化钛还原重铬酸钾滴定法之间不存在显著性差异（置信度为95%）。Total iron content in four iron ore samples were measured by titanium trichloride reduction potassium dichromate titration and phenanthroline spectrophotometric method.The results show that,there was a good linear relationship between the mass and the absorbance of iron when the content of iron was between 0.8 ～ 1.6 mg,after adding 5 mL（15 g/L） ascorbic acid and 5 mL（6 g/L） phenanthroline acid,and the absorbance of iron solution was measured with 0.6 mg iron as reference.The total iron content in four iron ore samples were determined for 6 times.The relative error of tested result and theoretical value was small,and the relative standard deviation（RSD,n = 6） was no more than 0.92%.The standard addition recovery was 91.0% -107%.Through the F-test and t-test,the result showed that there was no significant differences between the results and the standard values,and there was no significant difference between titanium trichloride reduction potassium dichromate titration and phenanthroline spectrophotometric method（95% confidence level）.

关 键 词：铁矿石 全铁 邻菲罗啉 分光光度法 滴定法 

分 类 号：O655[理学—分析化学]