Material

pH

σ

Peanut shell

9.15

1.446 ms/cm

Palm kernel shell

10.23

2.140 ms/cm

Coconut shell

10.27

10.040 ms/cm

Corn raid

9.68

4.200 ms/cm

Corn Straw

8.64

0.962 ms/cm

Corn stalk

10.06

9.020 ms/cm

Cassava stem

9.52

7.880 ms/cm

Papaya stem

9.27

6.260 ms/cm

Sawdust

7.46

1.257 ms/cm