A series of samples of spectrographically standardized aluminum alloys containing Mg, Mn, Fe, Si, Cr, Ti, Cu, Ni and Zn has been analyzed to examine the three methods described in Part B of this paper. Calibration curves prepared with the method(2)(Curve(2))and the method(3)(Curve(3))are examined by comparing them with the curves of method(1)(Curve(1)). Results are as follows: a)Curve(1)is in agreement with Curve(2)for Ti of concentration range from 39 to 1500 ppm, and for Si from 1200 to 6900 ppm. b)Curves(1)show somewhat convex shape for Zn, Ni and Cr, and somewhat irregular form for Fe and Cu, and are in agreement with Curves(2)roughly for latter two elements. c)Curve(3)has been prepared for Ti only, and proved useful for Ti in aluminium samples.