STUDIES ON COLOUR REACTIONS OF COMPLEXES OF RARE EARTHS WITH ERIOCHROME AZUROL B, 5-NITRO-1, 10-PHENANTHROLINE AND CETYLTRIMETHYL AMMONIUM BROMIDE

In our previous work, the colour reactions of quaternary complexes of rare earths with chromazurol S, 5-nitro-1, 10-phenanthroline (5-N-phen) and cetyltrimethyl ammonium bromide (CTAB) were reported. In this paper, the colour reactions of rare earths with eriochrome azurol B(ECB), 5-N-phen and CTAB will be systematically investigated. The results show that the sensitivity of the ECB system is higher than that of the CAS system. It is of interest to note that in the past ECB was only