a2. Dissolve the salt in distilled water and perform successive fuming . nitric acid separations (the first two separations at concentrations slightiy greater than 75%) until the strontium hes been separated changed as required by the mass of calcium present keeping in mind | cm that minimm volumes are always best. Final Nitric Acid Separation Allow the calcium and strontium nitrates to settle, then filter if i. through a 2.8 cm fiber filter using a Pisher Filtrator and a fluorethene funnel. Discard the filtrate. With the suction off, transfer the remaining precipitate in the beaker to the fluorethene funnel with distilled water and collect the resulting sowition of nitrates in a 250 ml beaker. Apply suction and thoroughly drain the filter. Evaporate slowly to dryness, then dissolve the residue in 23 ml of distilled water. Add 77 ml of fuming HNOz (90%) with stirring. Stir for 30 minutes using @ magnetic stirrer and Teflon covered bar. Allow the styvontium nitrate precipitate to settle and filter through a 2.8 cm glass fiber filter with a Fisher Filtrator and a fluorethene funnel. Remove as much nitric acid as possible. Discard the filtrate. Dissolve the venaining precipitate in the beaker with distilled water. mransfer to <u: Pluorethene funnel and collect-the solution in a 40 ml centrifuges ‘ice. * 1.) mi o Keep the volume at a minimum, preferably not over 2 eee 0 nCCY IO SRETIScmeARPASPN? T Scented heii The volumes of 15% HNOz solutions may be fi or 6 or more separations. 7 ; Samples with high calcium content will require 5 _ _ from the caicium.