
TY  - JOUR
A1  - Goyal, SS 
A1  - Tandon, JP 
T1  - Spectrophotometric studies of chelate formation of lanthanum and thorium with picramine azo dyes
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1968
VL  - 21
IS  - 10
SP  - 2433
EP  - 2436
KW  - 
UR  - https://doi.org/10.1071/CH9682433 
N2  - 0,O'-Dihydroxypicramine azo dyes form water-soluble yellowish pink complexes with thorium and lanthanum in the pH ranges 1.5-4 and 6-9 respectively. The compositions of the complexes determined by continuous variations and molar ratio methods were found to be 1 : 2 in thorium-Picramine CA and 1 : 1 in lanthanum-Picramine R systems. The order of the formation constant of thorium-Picramine CA complex is 1011 and that of lanthanum-Picramine R is 105. The free energy changes of formation are also calculated. 
ER  -

