fo . Pour remaiaing sample from Sottle into the 2 liter beaker, add 50 ml concentration HNO to bortle to rinse walls, add to beaker. Rinse with water and add to sample. Adjust pH to approximately 1 and heat sample to 80°C. Stir. Add to sample Strontium carrier: Yttrium carrier: 905, tracer: CaCl 40 mg 40 mg 1 ml (X10,000 dpm) 0.1 M: 50 al Digest sample at 80°C for 30 minutes while stirring. Adjust pH = 4. Add 40 ml saturated oxalic acid solution and mix well. Drop add 6 M NaOH to adjust pH = 4. Digest (with stirring) for 30 minutes. 10. Remove from heat, remove stirring bar, let settle overnight. ll. Filter entire sample through a 2 inch Whatman 42 filter paper mounted in filter assembly. Wash the precipitate once with ammo- nia wash solution. 12. Transfer filter paper and precipitate to a 150 ml beaker. 125°C in a muffle furnace. Dry at Slowly raise the temperature (over an eight hour period) to a maximum of 500°C. Continue heating at 500°C overnight. 13. Cool the sample and add small volumes of concentrated HNO. rate slowly to dryness. Evapo- Dissolve residue in 60 ml of 0.08 N HCI. Adjust pH = lL. 23