Coprecipitation of 137Cs and 85,90Sr radionuclides from aqueous solutions with the solid phases of CsBPh4 and [M(18-crown-6)]BPh4 (M = Na+, Cs+)

The possibility of joint recovery of cesium and strontium radionuclides from their aqueous solutions with the solid phase of CsBPh₄ or M(18-crown-6)]BPh₄ (M = Na⁺, Cs⁺) was examined. Depending on the solid phase composition, the degree of coprecipitation of ^85,90Sr and ¹³⁷Cs varies from 40 to 95%. The degree of coprecipitation of ^85,90Sr and ¹³⁷Cs from solutions with the solid phase of the complex compounds is 1.5–3 times higher than with the CsBPh₄ phase. The kind of the anion (NO₃⁻ or Cl⁻) affects the coprecipitation of^85,90Sr and ¹³⁷Cs with the solid phase of the complex compounds M(18-crown-6)]BPh₄.