Material

pH

σ

Peanut shell

5.27

1.426 ms/cm

Palm kernel shell

6.15

1.297 ms/cm

Coconut shell

6.32

2.110 ms/cm

Corn raid

5.97

1.110 ms/cm

Corn straw

6.21

2.03 ms/cm

Corn stalk

7.44

1.768 ms/cm

Cassava stem

7.71

1.115 ms/cm

Papaya stem

7.27

0.993 ms/cm

Sawdust

6.27

1.049 ms/cm