. Chemical News and Journal of Industrial Science . any value. In addition to these methods several others were tried,but none could be compared with the bromate method. Since yttrium bromate comes between the bromates ofpraseodymium and neodymium, with regard to their solu-bility in water, and because the bromate of praseodymiumis more soluble than the corresponding compound of yttrium(jfourn. Am. Chem. Soc, xxxi., 913), it was consideredthat by crystallising a mixture of erbium, thulium, andpraseodymium bromates that praseodymium would comebetween erbium and thulium. An experiment along this
. Chemical News and Journal of Industrial Science . any value. In addition to these methods several others were tried,but none could be compared with the bromate method. Since yttrium bromate comes between the bromates ofpraseodymium and neodymium, with regard to their solu-bility in water, and because the bromate of praseodymiumis more soluble than the corresponding compound of yttrium(jfourn. Am. Chem. Soc, xxxi., 913), it was consideredthat by crystallising a mixture of erbium, thulium, andpraseodymium bromates that praseodymium would comebetween erbium and thulium. An experiment along thisline showed that praseodymium rapidly accumulated inthe least soluble fraction. However, by gradually feedingthis substance through the most soluble fractions, theywere kept larger and the erbium was swept out. Owingto the rapidity with which praseodymium separated fromerbium, it was thought advisable to try a mixture of thebromates of yttrium and praseodymium carrying small 7b Thulium. , Chemical News,I Aug. i8, 1911 Crude Yttrium Earth Nd, SmGd Tr, DyYt, Ho Tr ?, Dy Dy, Ho Dy ?, HO ? Ho, Yt Yt Yt, Er 156 series of about 20 fractions. Tm, YbLu, Er
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