Table 3 Chemical constituents of extracted silica.

From: Application of response surface methodology (RSM) for experimental optimization in biogenic silica extraction from rice husk and straw ash

No

Compositions, wt.%

Extracted silica at the optimized conditions

1

SiO2

98.74

2

Al2O3

0.26

3

CaO

0.23

4

Fe2O3

0.18

5

P2O5

0.16

6

SO3

0.13

7

Cl

0.11

8

ZnO

0.08

9

Na2O

0.05

10

MgO

0.03

11

K2O

0.02

12

MnO

0.01

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