Logarithms of the overall stability constants (beta(1), beta(2) beta(3
) and beta(4)) of acetylacetonate complexes of berkelium(IV) in aqueou
s 1 M NH(4)CLO(4) at 25 degrees C are equal to 9.3, 18.3, 27.3 and 33.
4, respectively, as determined by solvent extraction.