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

Table 8

Determination of thorium in gas mantle.

	Amount of thorium (μg mL^−1) ± SD
Sample	(𝑛=4)
	Added	Found	Recovery %
Sample 1	—	1.54±0.83	—
	0.5	2.15±1.84	98.62
	1.5	3.14±2.24	98.70
	2.5	3.94±1.10	94.20
Sample 2	—	2.42±1.15	—
	0.5	3.14±1.68	118.49
	1.5	3.78±2.64	103.56
	2.5	4.82±1.48	103.65