Pour remaining sample from sottle into the 2 liter beaker, add 50
ml concentration HNO to boctle 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 ng
40 mg
1 ml (X10,000 dpm)
O.1 M: 50 mi
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 oH = 4.
Digest (with stirring) for 30 minutes.
10.
Remove from heat, remove stirring bar,
ll.
Filter entire sample through a 2 inch Whatman 42 filter paper
mounted in filter assembly.
let settle overnight.
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 HCl.
Adjust pH = 1.
23