VOLUME 2 5, NO. 5, MAY 1953 743 therefore not due in a significant degree to the wave-length difference but is largely, if not solely, due to microabsorption effects as dealt with by Brindley {2) ,Wilehinsky (5) and others.However, the-effect on the practical usefulness of the technique is small by currently accepted standards of accuracy for x-ray diffraction analysis.
checks with the gravimetric results for steels analyzed on a routine basis. A sample which dissolves quickly may be analyzed in about 15 minutes and a series of samples in 30 to 45 minutes.Determinations carried out on some high alloy National Bureau of Standards steel samples of high carbon content indicated that it was necessary to use extra persulfate for partial oxidation of the sample. By using 15 ml. of persulfate, absorbance values were obtained for National Bureau of Standards samples 50a, 50b, 134, 153, and 132a which corresponded to their certified silicon concentrations. The plain carbon and low alloy steel curve was used for reference. This same excess of persulfate with the plain carbon and low alloy steels had the tendency to lower the absorbance.
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