Zn→

As↓

0 mg/L

1 mg/L

2 mg/L

3 mg/L

0 mg/L

6.8

7.2

11.1

10.7

0.5 mg/L

12.3

9.5

8.1

12.7

1 mg/L

10.2

9.5

9.3

8.3

2 mg/L

9.1

6.0

6.3

8.2

P value→

0.034

0.515

0.072

0.030

Comment

significant

not significant

not significant

Significant