By Richard Busch
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TO the dry sample HNO ~. Heat to destroy the acid. cone. Step 2. add 500 ml cone. Destroy organic nitrates HC1 and 250 ml cone. matter by repeated and to drive off evaporation HC1. Boil the semi-dry residue for i5-2CI min. with cone. dilute with 300 ml water and heat the mixture Allow the solids Step 3. of iron. Combine Boil the solid residue the solutions (Solution M). of water. l until (Solution L). n and filter and dissolve silica solid with five times the melt in 100-i50 off and discard HC1, to boiling.
Step 7. Combine the effluents to dryness. 45 Dissolve from the column and evaporate the residue M HCI and proceed them in 25 ml of O. 7 in the Procedure. (Note 5). NOTES i. Violent effervescence is prevented by the use of the water bath for cooling and the slow addition of the hydrofluorie acid. - PROCEDURE Residusl 2. other 3. Fe ‘3, CO+2, elements Ca+2, Th+4, freely through +6 Cr , U l “(CONTINUED) +4 , Pa +5 are held in the column Pb+2,’ +4 ,Po, +3 Bi (log D> 1); while and AC+3 of the elements Ra+2, Al+3, of interest pass and the other alkaline earth elements are slag not absorbed.
Dissolve Preparation of Standard Beryllium iO. 62 gm of c. p. BeW4 which has been dried overnight solution containing Pipet exactly conical addition 5 rein, Transfer during the transfer. O. 5 ml of Fe carrier clean stirring. Heat centrifuge tube, on a steam Stir bath for to a clean centrifuge for Step 4. to the supernate transfer and retain 20~0 NaOH concentration. q precipitate Centrifuge, to another sufficient the supernate the Fe(OH) and by the dropwise the solution a 5~0 NaOH transfer and retain of the sample to neutral contains solution centrifuge, vigorous into a 40-ml snd add O.