苯基荧光酮分光光度法测定铌钽矿中钽  被引量:7

Determination of tantalum in niobium-tantalum ores by spectrophotometry with phenylfluorone

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作  者:沈亮亮[1] 董红敏[1] 吴雅欣[1] 覃事栋[1] 

机构地区:[1]吉首大学化学化工学院,吉首416000

出  处:《分析试验室》2013年第12期122-124,共3页Chinese Journal of Analysis Laboratory

摘  要:以分光光度法为检测手段,采用苯基荧光酮测定铌钽矿中Ta,对反应条件进行了实验及优化:铌钽矿石经碱熔融预处理后,甲基异丁基酮分离Ta,以酒石酸作为辅助络合剂,在表面活性剂氯化十六烷基吡啶存在下,控制温度在20℃,苯基荧光酮与Ta发生灵敏的显色反应。络合物的摩尔吸光系数为2.42×10^5L·mol^-1·cm^-1,其最大吸收波长为526nm,与试剂空白溶液相比,发生了65nm红移,且Ta质量浓度在0.16~0.80μg/mL范围内符合比尔定律,线性回归方程为A=1.3938ρ-0.030,相关系数为0.9992。常量的Mg^2+,Sr^2+,Ba^2+,Fe^3+,Pb^2+等对Ta的测定几乎不干扰,方法已应用于铌钽矿Ta的测定。A method for the determination of tantalum in niobium - tantalum ores with phenylfluorone by speetrophotometry was developed.. The reaction conditions were tested and optimized, the optimal conditions of determination were as follows: the niobium -tantalum ores were pretreated with alkali melting, and tantalum was separated by methylisobutylketone. Tantalum could be determined by phenylfluorone color reaction at 20℃ under an existing surfaetant cetylpyridinium chloride with tartaric acid as an auxiliary complex agent. Apparent molar absorption coefficient was 2.42×10^5L·mol^-1·cm^-1, and the maximum absorption wavelength was 526 nm, which showed a red shift of 65 nm compared with that of the reagent blank solution. Beer's law was obeyed in the range of 0.16 -0.80 μg/mL for tantalum, and the linear regression equation was A=1.3938ρ-0.030 (μg/mL) with the correlation coefficient of 0.9992. The constant ions such as Mg^2+ , Sr^2+ , Ba^2+ , Fe^+ , Pb^2+ did not influence the accuracy of the determination of tantalum. This method has been used for the determination of tantalum in niobium - tantalum ores with satisfactory results.

关 键 词: 苯基荧光酮 氯化十六烷基吡啶 光度法 

分 类 号:O657.3[理学—分析化学]

 

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