Table 2 Copper content of grains and nuts (μg/g) dry weight*

Sample

1

2

3

4

5

6

7

8

9

Mean ± SD

White Maize

1.43

2.35

4.04

2.69

2.04

1.53

1.74

1.38

2.73

2.22 ± 0.86

yellow Maize

4.43

1.24

1.39

2.73

1.62

2.36

1.23

2.11

2.96

2.35 ± 1.04

White Sorghum

3.44

2.79

3.70

4.58

3.40

3.26

4.10

3.39

3.38

3.62 ± 0.65

Red Sorghum

2.66

2.98

3.21

3.39

3.41

2.96

3.89

2.22

3.71

3.16 ± 0.52

Millet

5.10

3.95

4.12

2.48

4.31

4.07

3.62

3.73

3.56

3.83 ± 0.60

Groundnuts

9.50

8.29

10.03

6.26

9.74

11.81

8.32

8.47

6.16

8.73 ± 1.80

Cowpea

9.47

8.41

7.41

16.95

9.42

10.11

7.43

10.40

9.82

9.93 ± 2.85