Variables

April

May

June

Overall mean

Range

Zn (ppm)

2.17 ± 0.65^a

1.72 ± 0.36^b

1.43 ± 0.0.55^b

1.77 ± 0.53

1.43 - 2.17

Cr (ppm)

0.78 ± 0.27^a

0.61 ± 0.24^a

0.56 ± 0.12^a

0.65 ± 0.21

0.56 - 0.78

Pb (ppm)

0.29 ± 0.16^a

1.17 ± 0.07^b

0.12 ± 0.02^b

0.19 ± 0.11

0.12 - 0.29

Fe (ppm)

1.82 ± 0.28

1.40 ± 0.27^b

1.18 ± 0.22^b

1.52 ± 0.34

1.18 - 1.82