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a eS 4866,
Radiochemical Analysis of ®Sr and 137¢s in Seawater
Procedure
Fe, Sr and Cs carriers were added to the water
samples which were acidified with hydrochloric acid
immediately after the samples were taken.
-
After the Ca and Sr carbonates were dis-
+--gsolved in diluted HCl, the pH of the solution was adjusted
to 8 with an ammonia solution in order to separate iron
hydroxide by filtration.
After EDTA was added to the
filtrate as a masking agent for the majority of the Ca,
4g0dium carbonate was added to separate Sr with the remain| .ing free Ca. Precipitate was dissolved in diluted
HNO3 then the fuming HNO method was used to separate
;8r.from Ca. 90Sr was counted with a low background,
| yWindowless, gas flow counter.
Nitric acid was added
to -the filtrate from the carbonate and 137Cs was separated
,eby; the addition of microcrystalline ammonium molybdophos-
£phate.
137Cs was counted with a r-ray spectrometer.
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Sodium carbonate was added to separate the Ca and Sr
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*Katsuko SARUHASHT: Yukio KATSURAGI
and Teruko sANAZAdA