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显色剂Ferron用量对纯单核铝溶液中Al3+浓度准确测定的影响
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作者单位
金晶, 常方, 张振江,毕树平 南京大学化学化工学院 
基金项目:国家自然科学基金项目(21177054)
中文摘要:显色剂用量[Ferron]对铝浓度和铝形态的准确测量有显著影响,然而该问题未被人们充分认识,不同课题组的研究人员在Al-Ferron体系测定时使用的Ferron浓度各不相同,造成所得的摩尔吸光系数ε存在明显差异,进而影响对聚合氯化铝溶液中铝形态的准确测量。本文对该问题进行了全面系统地研究,结果表明:纯单核铝溶液中ε随Ferron浓度的增加而呈指数型增加,直至[Ferron]达到2.0×10-3 mol/L时ε达到最大平台值并可视为常数。 [Ferron]的适宜范围为2.0×10-3~3.0×10-3 mol/L,该文选择[Ferron]的最佳用量为2.0×10-3 mol/L,此时可获得最准确、灵敏的分析结果。
中文关键词:Al-Ferron比色法  [Ferron]显色剂用量  ε-[Ferron]曲线  纯单核Al浓度
 
Effect of Ferron Dosage on Accurate Determination of Al3+ Concentration in Mononuclear Aluminum Solution
Abstract:Ferron dosage([Ferron]) has a significant effect on the accurate determination of Al3+ concentration and its speciation by Ferron colorimetric method.However,the importance of this most critical factor has not been clearly realized.Different Ferron concentrations have been used in Al-Ferron system by researchers from different laboratories.Various molar absorption coefficient ε values for different Ferron concentrations have been obtained,which have affected the accuracy for determination of Al speciation in polyaluminum chloride(PAC) solution unavoidably.Systematic and comprehensive studies were conducted in this work.It is found that the molar absorption coefficient ε increases in exponential form with the increase of [Ferron] in mononuclear Al solution.ε-could be regarded as the maximum value at a plateau from “ε-[Ferron]” curves when [Ferron] reaches to 2.0×10-3 mol/L.The suitable [Ferron] range is from 2.0×10-3 mol/L to 3.0×10-3 mol/L,and 2.0×10-3 mol/L is the recommended optimal dosage achieving the most sensitive and accurate results.
Key Words:Al-Ferron colorimetric method  Ferron dosage  ε-[Ferron] curve  mononuclear Al concentration
引用本文:金晶, 常方, 张振江,毕树平.显色剂Ferron用量对纯单核铝溶液中Al3+浓度准确测定的影响[J].分析测试学报,2019,(5):558-562.
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