Ferron比色法中不同Ferron体系、溶解度和实验温度等因素对测定单核铝浓度的影响

Ferron比色法被广泛应用于铝形态分析检测中，但迄今为止可能影响其测量准确性的某些重要因素尚未进行过系统研究。以Al-Ferron显色体系摩尔吸光系数ε值为关键，系列考察了不同Ferron体系、Ferron溶解度、实验温度、离子强度和参比体系这五个因素对Ferron比色法测定单核铝浓度准确度的影响。研究结果表明：不同Ferron体系、Ferron的溶解度、实验温度是Ferron比色法中的重要因素，测定时应当予以高度重视，否则会影响测量结果的准确性;溶液的离子强度以及参比体系等则对测定基本无影响。通过实验结果以及相关文献的总结分析，优化了Ferron比色法的测定条件，从而为获得准确的单核铝浓度测量结果所需要采取的操作程序提供了标准规范。

Study on the Effects of Different Ferron System,Ferron Solubility,Experimental Temperature and Other Factors for the Accurate Determination of Mononuclear Aluminum Concentration in Aqueous Solution

Ferron colorimetric method has been widely used in aluminum speciation analysis. However, some important factors that may affect the accurate determination of mononuclear Al concentration have not been studied yet. Using molar absorption coefficient ε as a key indicator, the critical issues in Al-Ferron coloring reaction system have been investigated experimentally in this paper, including different Ferron system, Ferron solubility, experimental temperature, ionic strength and the reference system. The results show that three vital factors (different Ferron colorimetric system, Ferron solubility and experimental temperature) would significantly affect the accurate measurement of mononuclear Al concentration; whereas, other two factors like ionic strength and the reference have litter influence. Base on our experimental results and statistic analysis of relevant important literatures, we suggest that optimizing colorimetric conditions and standardizing operational procedures should be paid much more attention in Ferron colorimetric assay in order to obtain the accurate measurement results.