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

Table 7

Tolerance limits of foreign ions. [U(VI)-HNAHBH] system.

Foreign ion	Tolerance limit (in folds)
	Zero order	Second derivative
Ni(II)	3	10
Cu(II)	2	15
Co(II)	2	15
Zn(II)	2	8
Bi(III)	<1	20
Fe(II)	<1	30
Al(III)	<1	25
Th(IV)	<1	35
In(III)	<1	30
Ga(III)	<1	50