T value and significance

Hg

As

Pb

Cd

Zn

Cu

Cr

January

5.53***

4.55***

1.69 NS

3.15**

1.56 NS

3.67***

2.23*

April

3.44**

2.16*

3.94***

1.47 NS

1.27 NS

2.31*

3.05**

July

4.95***

2.22*

3.44**

1.19 NS

1.76 NS

3.76***

3.5***