Simultaneous spectrophotometric determination of chromium (VI) and iron (III) in alloys

International Scientific Conference on "Radiation-Thermal Effects and Processes in Inorganic Materials"

材料科学;物理学

Larionova, E.V.^1 ; Bulygina, K.A.^1

Tomsk Polytechnic University, 34, Lenin av., Tomsk

634050, Russia^1

关键词: 1 ,10-phenanthroline;    Curve fitting methods;    Diphenylcarbazide;    Empirical model;    Organic reagents;    Peak shape analysis;    Preliminary information;    Spectrophotometric determination;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/81/1/012093/pdf
DOI  :  10.1088/1757-899X/81/1/012093

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this work the possibility of simultaneous spectrophotometric determination of chromium (VI) and iron (III) in alloys with help of the mixed organic reagents (diphenylcarbazide and 1,10-phenanthroline, diphenylcarbazide and sulphosalicylic acid) is studied. We have applied curve fitting method to separate individual signals of chromium (VI) and iron (III) from overlapped absorption spectrum. Peak shape analysis of pure signals of complexes of chromium (VI) with diphenylcarbazide and iron (III) with the 1,10- phenanthroline and sulphosalicylic acid is previously carried out. For adequate application of curve fitting method we chose the optimal empirical models of signals taking into account preliminary information on their shape. Correctness of determination of concentration by means of the offered technique is proved by "added-found" method for a series of mixtures with different ratios of concentration of chromium (VI) and iron (III). It is founded that the error of determination of concentration doesn't exceed 11%.