Validation of spectrophotometric method for the determination of manganese in steel
Alenka Kocjan · PeFprints (University of Ljubljana) · 2012
The main issue of my thesis is the element manganese, which I have determined in the steel by an analytical method called spectrophotometry. I verified the appropriate validation parameters of the spectrophotometry method by setting wavelength measurement recorded absorption validation parameters and compared them with the absorption spectra of the samples. The results are shown plotted with the calibration curves, indicating the dependence of absorbance on the manganese concentration. I determined the proportion of manganese in steel from the calibration curves. With the help of analytical grade standard MnCl2 × 4H2O with potassium iodate(VII) I examined the stoichiometry oxidation of manganese to manganate. Several analytical methods, such as: gravimetric, atomic absorption spectrometry and complex titration were used to verify the purity of Standard MnCl2 × 4H2O and then determine manganese. The water content in salt crystalohydrate MnCl2 × 4H2O was determined by titration, according to Karl – Fischer. For the methodological part of the thesis I prepared a two-day workshop, which takes place during the project week at school. Through this workshop pupils become familiar with the basics of spectrophotometry and experimental work. It is intended for 7 th- graders of the Primary school at the subject of Natural Science.