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Table 6 Results for metal ions determination in food samples obtained using the optimum conditions.

From: Salicylic acid functionalized silica-coated magnetite nanoparticles for solid phase extraction and preconcentration of some heavy metal ions from various real samples

Sample

Added (μg g-1)

Found (μg g-1) a

  

Cu(II)

Ni(II)

Cd(II)

Cr(III)

Tomato

0.00

10.00

2.56 ± 0.55 12.72 ± 0.37

8.95 ± 0.24 19.24 ± 0.35

1.12 ± 0.05 11.26 ± 0.04

3.72 ± 0.40 13.49 ± 0.09

Spinach

0.00

10.00

0.56 ± 0.04 10.69 ± 0.15

1.53 ± 0.12 11.29 ± 0.18

0.08 ± 0.02 10.05 ± 0.02

5.85 ± 0.38 16.17 ± 0.29

  1. (N = 5)
  2. a Mean of five determinations ± standard deviation