|
Elements
|
Mean ± 3σ (ppm)
|
Limit of detection LOD (ppm)
|
|---|
|
Mg
|
11,433 ± 0.43
|
1100
|
|
Al
|
7733 ± 0.01
|
95
|
|
Si
|
38,403 ± 0.036
|
160
|
|
P
|
2959 ± 97
|
10
|
|
S
|
3225 ± 68
|
13
|
|
K
|
21,500 ± 0.021
|
16
|
|
Ca
|
13,800 ± 0.009
|
17
|
|
Mn
|
414 ± 28
|
5
|
|
Fe
|
5859 ± 87
|
12
|
|
Cu
|
6 ± 3
|
2
|
|
Zn
|
33 ± 3
|
1
|
|
Rb
|
28 ± 1
|
1
|
|
Sr
|
19 ± 1
|
1
|
|
Y
|
2 ± 1
|
1
|
|
Zr
|
9 ± 2
|
1
|
|
Nb
|
3 ± 2
|
1
|
|
Ag
|
40 ± 8
|
2
|
|
Cd
|
16 ± 9
|
2
|
|
Pb
|
–
|
2
|
|
Th
|
15 ± 5
|
2
|
- Macro and micro-elements content were measured on pellets of N. lotus leave samples (32 mm diameter × 3 mm thickness) using energy dispersive x-ray fluorescence (ED-XRF) spectroscopy (SPECTRO X-Lab 2000 spectrometer). Measurements were done in triplicate and data presented are expressed in ppm and are mean value ±3σ. The limit of detection for light elements (Si, Al, Mg, and Na) was in the range of 25–50 ppm and 1–5 ppm for heavy metals
