Gerald L. Wendt, Robert S. Landauer
1920 Journal of the American Chemical Society  
The fact that the latter 3 analyses show a progressive increase in the value of the atomic weight suggests the possibility that the degree of purity of the 3 preparations might have progressively changed. Nevertheless, since from the method of crystallization they should have been essentially alike, the appearance of a march in the figures is probably fortuitous. In any case no claim can be made for great accuracy in the result, because the amount of crude material was not sufficient for work
more » ... fficient for work of the highest precision. In spite of this lack, the outcome serves its purpose, for it shows that the atomic weight OC this lead from a Japanese radioactive spring is not far from that of ordinary lead. Probably it is chiefly ordinary lead, with perhaps not over 5 yo of isotope of lower atomic weight. The result coincides well with the .fact, reported by Hayakawa and Nakano,l that the lead chloride shows but little if any radioactivity. The quantity of the metallic lead obtained was too small to determine a trustworthy value for its density.
doi:10.1021/ja01450a009 fatcat:3nxmweyyw5annhfuggkwao5nky