Sequential determination of thorium and rare earths with EDTA and kojic acid.
Kojic acid can be used instead of acetylacetone to form a ternary complex with Th-EDTA that is more stable than the corresponding Xylenol Orange ternary complex, thus making it possible to titrate lanthanides with EDTA at pH 5.5 after titration of thorium at pH 2.
Shetty
S Y
SY
Analytical Chemistry Division, Bhabha Atomic Research Centre, Modular Labs., Trombay, Bombay-400085, India.
Sathe
R M
RM