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sample requires 50 ml of the reagent to dissolve the matrix. A 50-gram nickel sample was analyzed by separately dissolving five 10-gram portions of the sample and then concentrating the residue on a single filter. Tartaric acid is added to the reagent to prevent hydrolysis of titanium, etc. when high purity superalloys are analyzed by this method. The method has been evaluated for a few alloys only to illustrate its future applicability to alloys which may have very low sulfur levels. There are no standard materials available to check the validity of the method at the 1-ppm level; however, the precision (a value) is given for several materials, each was analyzed 20 times.The time required for the dissolution of a sample in the Meineke Reagent depends upon the type of material and its surface area. Finely divided nickel or iron powders dissolve in a few hours, whereas nickel pellets 0.6 cm in di-

This research was partially supported by a grant from the Brown Hazen Fund of the Research Corporation. Names of companies or commercial products are given solely for the purpose of providing specific information; their mention does not imply recommendation or endorsement by the U.S. Department of Agriculture over others not mentioned.

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