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

Table 3

Determination of thorium in monazite sand samples.

Sample	Amount of thorium (μg mL^−1) ± SD*
	Present method	AAS method	Relative error (%)
S1	2.29±2.20	2.20±0.56	4.10
S2	5.08±1.68	4.90±2.14	3.67
S3	3.22±1.68	3.26±0.56	−1.25

*Average of three determinations.