T value and significance

Hg

As

Pb

Cd

Zn

Cu

Cr

January

18.01***

1.48 NS

1.97 NS

3.48***

7.55***

8.06***

4.08***

April

5.14***

9.82***

2.5*

3.15**

2.95**

6.98***

5.73***

July

6.23***

4.89***

2.21*

2.37*

4.37***

6.64***

8.59***