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

Table 14

Determination of uranium and thorium in spiked water samples.

Water sample	Amount (μg mL^−1)				Recovery (%)
	Spiked		Found (𝑛=4) ± SD
	U(VI)	Th(IV)	U(VI)	Th(IV)	U(VI)	Th(IV)
Tap water	0.50	1.45	0.48±0.02	1.48±0.03	96.0	102
	1.40	2.60	1.45±0.01	2.52±0.01	103.6	96.9
	2.00	3.50	2.04±0.22	3.38±0.04	102.0	96.6
Bore well water	0.80	3.80	0.83±0.004	3.90±0.03	103.7	102.6
	2.40	2.50	2.48±0.05	2.44±0.06	103.3	97.6
River water	0.45	0.60	0.44±0.01	0.63±0.03	97.7	105.0
	0.80	1.40	0.84±0.03	1.45±0.02	105.0	103.6
	1.50	2.90	1.48±0.02	2.83±0.06	98.6	97.6
	2.20	3.80	2.14±0.03	3.85±0.04	97.3	101.3