Spectrophotometric Determination of Iron(II) and Cobalt(II) by Direct, Derivative, and Simultaneous Methods Using 2-Hydroxy-1-Naphthaldehyde-p-Hydroxybenzoichydrazone

Table 3

Determination of iron in alloy steels.

Alloy steel composition (%)	Amount of iron (%)
	Certified value	Present method±SD^∗	Relative error (%)
High tensile steel; BY0110-1; (42.98 Zn, 19.89 Si, 0.351 Pb, 0.06 Sn, 0.04 Cd, 0.024 As, 0.14 Cu, and 4.13 Fe); YSBC19716	4.13	4.06±0.021	0.17
(34.26 Zn, 0.38 Si, 1.2 Cd, 48.57 Sb, 0.95 S, and 0.32 F); GSBD33001-94	34.26	4.18±0.022	0.01
(9.29 Al, 1.04 Ca, 9.53 Fe)	9.53	9.46±0.039	0.08

*Average of five determinations.