Literature problem. Vanadium alloys containing 3-5% 3-5% chromium and titanium are promising structural materials for fusion reactors. Mechanical and physical properties of the alloy depend on the concentrations of alloy elements. L. F. Tian, D. S. Zou, Y. C. Dai, L. L. Wang, and W. Gao in Anal. Methods 2017, 9, 4471-4475 propose oxidation of chromium to chromate, followed by spectrophotometric measurement of chromate for the determination of chromium in such alloys.

a. Abstracts provide quantitative information about the performance of the method. What is the range and precision of the method?

b. Introductions explain the need for the new procedure. What alternate methods could be used for quantitation of chromium in vanadium-based alloys?

c. Experimental describes the apparatus and methods. How was the solid alloy converted into a form suitable for spectrophotometric analysis?

d. Results and discussion detail optimization of the steps in the procedure. What was the purpose of adding tartrate?

e. Which wavelengths could have been used? Which was used? 

f. How was the accuracy of the method validated?