Table 3.
Elemental analysis from energy dispersive X-ray spectroscopy for untreated specimens, EDTA (ethylene-diamine tetraacetic acid), formic acid (CH2O2), hydrochloric acid (HCl), and HCl/EDTA mixture treated samples. Both atomic and weight percentages are provided.
| Treatment | Untreated | EDTA | HCI | CH 2 0z | HCI/ EDTA | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Element | At.% | Wt.% | 2σ | At.% | Wt.% | 2σ | At.% | Wt.% | 2σ | At.% | Wt.% | 2σ | At.% | Wt.% | 2σ |
|
C N O Na P Ca |
20.69 13.3 41.6 0.56 9.766 14.07 |
12.55 9.4 33.6 0.65 15.28 28.48 |
0. 11 0.2 0.2 0.02 0.05 0.07 |
60.06 14.8 24. 17 0.238 0.706 0.000 |
53.71 1 5.4 28.80 0.408 1.628 0.000 |
0.12 0. 3 0. 1 6 0.017 0.01 6 0.000 |
60.6 15.85 21 .501 0.414 1.63 0.000 |
53.8 1 6.39 25.4 0.702 3.74 0.000 |
0.1 0. 16 0. 11 0.018 0.03 0.000 |
55.46 1 8.4 25.45 0. 188 0.502 0.004 |
49.31 19.1 30.15 0.321 1.150 0.013 |
0.11 0.2 0.16 0.016 0.013 0.007 |
61.78 13.7 23.62 0. 168 0.736 0.000 |
55.44 14.3 28.24 0.288 1.703 0.000 |
0.12 0.3 0.1 6 0.017 0.016 0.000 |
The relative standard deviations are given as 2.