Pre-Concentration of Cs-137 Through Sorption: Low Level Analysis in Seawater
Comparative studies for the sorption of Cs-137 on silica coated potassium copper hexacyanoferrate and
potassium cobalt hexacyanoferrate materials and an efficient method was optimized for its maximum sorption. The
column sorption method was applied by packing synthesized material in specifically designed columns and low
level/fallout level Cs-137 was sorbed on it from 2-4 L seawater sample (0.237 Bq/L). Higher sorption of Cs-137 was
achieved on silica coated potassium copper ferrocyanate by optimizing the physical conditions at pH 8. Sorption potential
of copper ferrocyanate was higher as compared to cobalt ferrocyanate under same optimized conditions. The developed
method was, in field, applied for seawater sample collected from Arabian Sea, near the outfall of Karachi Nuclear Power
Plant (KANUPP, Pakistan) by pumping 2-4L of seawater through synthesized material packed in columns. The results
suggested that developed method was much precise and accurate as compared to conventional method.
Keywords: Gamma spectrometer, hexacyanoferrate coated silica, low level Cs-137, sorption.
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