-_. _ UNCLASSIFIED AMALTTICAL PROCEDURE FOR THE SEPARATION OF TOTAL RADTOSTRONTIOM FROM A 300 SRAM SAMPLE OF SOTL le Dry the entire sample in an oven at 120°C. ae Sample, using standard sampling procedure (quartering prodess) until approximately 125 grams cf soil is cbtained as a repre sentative sample. 3. Ignite in # nickel crucible at 900°C. bbe - o0 6. Weigh out 100 grams of the ignited material. Add LOO grams of Na,CO, and mix thoroughly. Fuse in a muffle at-900°C (minizsum temperature) for 45 mihutes, (minimus time) until the melt ia clear and homogeneous. Cool by immersing in a beaker of cold water, withdrawing quickly at first. Continue immersing and withdrswing until the is cool enough to place on a transite board. The NagC03 Ishould not be wet at any tine. - a. + 9. f Wo. automatic grinder and grind to a fine powder. Transfer the ground fused meterial to a j-liter beaker ing 300 wl of hot distilled water, stirring constantly the particles are dispersed. Add slowly with continued stirring, 1000 ml of 60% 1 is sufficient to neutralize the fused material and all excess of acid. , 2. Evaporate with mechanical stirring until dense white are detected. The silica is now dehydrated. rt 13. Dilute to 2.5 liters with distilled water and allow to e ib. oF 5 « . -~ wit a i Filter the silica on No. 5 Whatman paper with suction. With 29-300 ml of hot 5% BC1, then with 250 ml of dis water. Transfer the filtrate and washings to the criggnl beaker. Wash the silica with 1% H33Q,, and discard th mie Sf UNCLASSIFTED 00131986 050 [05131079 TY?