Spectrophotometric Determination of Gold(III) Using 2-Hydroxy-3-Methoxy Benzaldehyde Thiosemicarbazone as a Chromophoric Reagent

Table 3

Determination of Au(III) in environmental water samples.

Certified reference materials (Composition)	Gold (μg mL^−1)		Relative error (%)
	Certified value	Found (𝑛=5)*
OXG 60	1.025	1.012	1.3
(SiO2, Al2O3, Na2O, K2O, CaO, MgO, TiO2, MnO, P2O5, Fe2O3^x)
SH 24	1.326	1.312	1.4
(SiO2, Al2O3, Na2O, K2O, CaO, MgO, TiO2, MnO, P2O5, Fe^x, S)

*Average of Five determinations.
^x1410 μg mL⁻¹of tartrate to mask “Fe.”