Element

Before conservation

After conservation

Wt%

At%

Wt%

At%

C

45.5

57.2

29.68

55.2

N

1.37

1.48

-

-

O

33.91

32

9.95

13.89

Na

2.36

1.55

14.75

14.33

Mg

0.68

0.42

-

-

Al

2.7

1.51

-

-

Si

6.93

3.73

-

-

K

0.71

0.27

-

-

Ca

2.39

0.9

-

-

Fe

3.44

0.93

11.2

4.48

Cu

-

-

34.43

12.1