2-Hydroxy-1-naphthaldehyde-P-hydroxybenzoichydrazone: A New Chromogenic Reagent for the Determination of Thorium(IV) and Uranium(VI)

Table 6

Tolerance limits of foreign ions. [Th(IV)-HNAHBH] system.

Foreign ion	Tolerance limit (in folds)
	Zero order	Second derivative
Cu(II)	5	25
Ni(II)	<1	20
Co(II)	<1	18
Zn(II)	<1	22
Bi(III)	<1	12
Fe(II)	<1	45
Al(III)	<1	60
U(VI)	<1	35
In(III)	<1	30
Ga(III)	<1	40