Quarter

Sample code

Cadmium

Lead

Manganese

Nickel

mg/kg

Obi-Iloh

1

14.9

153.8

483.0

24.5

2

4.3

88.0

333.9

17.0

3

2.8

44.0

283.0

26.6

4

2.8

109.8

447.5

24.5

Mean

6.2

98.9

386.9

23.0

Obi-Ogene

5

3.3

109.6

544.0

22.3

6

2.3

107.6

501.3

27.6

7

6.2

150.8

622.4

29.8

8

7.2

161.6

752.0

b.d

Mean

4.8

132.4

604.9

19.9

Adonishaka

9

5.6

140.0

617.2

1.1

10

6.2

53.8

361.3

23.4

11

4.0

55.5

271.5

24.6

12

5.0

66.6

376.9

19.1

Mean

5.2

79.0

406.7

17.0

Ukwuole

13

2.8

77.7

221.3

19.2

14

5.0

76.6

224.7

19.1

15

2.8

66.6

356.1

22.3

16

1.2

96.9

328.7

25.6

Mean

3.0

79.5

282.7

21.6

Reference (DPR, 2002)

0.8

85.0

850.0

35.0