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

Table 6

Determination of iron in food and biological samples.

Samples	Amount of iron(μg mL^−1) ± SD (𝑛=4)
	Found			Recovered
	present	AAS	Added	present	AAS	% recovery
Wheat	6.68±0.18	6.40±0.09	5	11.40±1.15	11.28±0.10	97.6
Rice	14.10±40.25	16.46±0.18	5	19.7±40.27	21.04±0.48	102
Tomato	11.96±1.20	12.68±0.14	5	17.68±0.25	17.44±0.95	104
Orange	18.12±0.73	16.94±0.66	5	22.20±0.75	22.26±0.68	96
Banana	10.12±1.46	11.4±0.12	5	14.86±1.45	15.86±1.46	98.3
Prostate gland	3.26±0.28	2.98±0.08	6.5	10.04±1.68	9.54±0.94	103
Benign (enlarged prostate gland	12.38±3.18	13.15±1.18	6.5	17.96±1.56	20.18±1.66	95.12