a
add “42 py tracer,
-
IT& subsequent
.
1 ml of 85% HPC, 0.2 ml of saturated Ca (NO3)>.
90.
.
-
.
Strontium analysis ts to be performed on sample add 1
.
.
.
ml strontium carrier, 1 ml yttrium carrier and 1 al of
385
.
Strontium
tracer to the sample as well,
when sample has reached 80°C, add :0 ml of 30% #0, and stir sampie 30
minutes.
If the sample is allowed to stand overnight, all reagents ex-
cept 4,0, should be added immediately after aliquoting,
2
add 190 ml of 58% NH,OH and allow sample to dizest for one hour.
If ex-
cessive foaming occurs add 1-2 drops octyl alcohol,
remove sample from hot plate, remove stirring bar and after 1-2 hours
check for complete precipitation by adding a few drops of NH,OH,
4
allow precipitate to settle overniznt,
aspirate supernate taking care not to disturd precipitate,
wash down the sides of the beaker with 25-30 ml of cone. HNO, and bring
to complete dryness on a hot plate at 150°C,
10.
repeat step 9,
ll.
place sample in a 500°C preheated muffle furnace for 2 hours,
12.
remove sample and cool to room temperature,
13.
add enough conc. HNO, to cover the salts and bring to dryness at 150°C,
repeat step 13 five times,
dissolve salts in 70 ml of 7.2N HNO,
add 25 mg of NaNO., cover and heat at 80°C for 10-15 minutes,
2
ro
allow solution to stand 24-438 hours,
13