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

Table 11

Linear regression analysis of the determination of U(VI) and Th(IV) in mixture by second derivative spectrophotometry.

Metal ion determined	Wave length (nm)	Other metals present (μg mL^−1)		Slope	Intercept	Correlation coefficient
		U(VI)	Th(IV)
Uranium(VI)	477			1.0×10^−4	5×10^−5	0.9998
			1.856	0.9×10^−4	4×10^−5	0.9996
Thorium(IV)	448			6.9×10^−4	−1.0×10^−6	0.9999
		1.908		5.8×10^−4	−0.8×10^−6	0.9998