Table 3 Mean elemental compositions (wt%, 72 Oxygen) and coefficients of variation (CV, %) and standard deviation (sd) for individual erionite fibers analyzed by SEM-EDS under four different sample treatments: dry & air-dispersed, DI water-dispersed, digested (bulk), and digested (bulk + dust). Data are presented for two instruments (SEM-EDS.1 and SEM-EDS.2).
SEM-EDS.1 | SEM-EDS.2 | ||||||||
|---|---|---|---|---|---|---|---|---|---|
Dry & Air dispersed | DI water dispersed | Digested (bulk) | Digested (bulk + dust) | Dry & Air dispersed | DI water dispersed | Digested (bulk) | Digested (bulk + dust) | ||
Si | Mean | 30.26 | 31.28 | 31.39 | 30.99 | 28.81 | 29.27 | 30.22 | 28.23 |
sd | 1.34 | 3.00 | 1.40 | 1.69 | 0.60 | 1.01 | 1.53 | 3.67 | |
Median | 29.84 | 30.67 | 30.63 | 30.28 | 28.81 | 28.95 | 29.69 | 28.95 | |
CV | 4.43 | 9.58 | 4.47 | 5.45 | 2.07 | 3.45 | 5.06 | 13.01 | |
Al | Mean | 6.04 | 5.43 | 5.44 | 5.78 | 7.59 | 7.16 | 6.52 | 9.28 |
sd | 1.31 | 3.71 | 1.49 | 1.79 | 1.07 | 0.86 | 1.56 | 5.18 | |
Median | 6.44 | 5.97 | 6.05 | 6.53 | 7.52 | 7.38 | 6.92 | 7.66 | |
CV | 21.62 | 68.28 | 27.32 | 30.93 | 14.15 | 12.05 | 23.87 | 55.87 | |
K | Mean | 1.11 | 0.78 | 0.48 | 0.61 | 1.22 | 0.82 | 0.55 | 0.52 |
sd | 0.44 | 0.65 | 0.38 | 0.41 | 0.30 | 0.40 | 0.40 | 0.50 | |
Median | 1.26 | 0.99 | 0.64 | 0.78 | 1.21 | 0.86 | 0.71 | 0.67 | |
CV | 39.97 | 83.84 | 78.60 | 67.82 | 24.23 | 48.89 | 73.04 | 97.25 | |
Ca | Mean | 0.62 | 0.46 | 0.23 | 0.43 | 0.21 | 1.16 | 0.50 | 0.55 |
sd | 0.39 | 0.48 | 0.28 | 0.33 | 0.20 | 0.42 | 0.31 | 0.49 | |
Median | 0.72 | 0.49 | 0.26 | 0.56 | 0.19 | 1.28 | 0.65 | 0.83 | |
CV | 63.30 | 104.77 | 120.08 | 78.08 | 94.88 | 36.09 | 61.65 | 88.79 | |
Mg | Mean | 1.18 | 0.44 | 0.58 | 0.62 | 1.35 | 1.14 | 1.01 | 0.81 |
sd | 0.52 | 0.57 | 0.49 | 0.44 | 0.39 | 0.54 | 0.63 | 0.71 | |
Median | 1.26 | 1.20 | 0.76 | 0.74 | 1.42 | 1.31 | 1.2 | 1.09 | |
CV | 43.98 | 130.18 | 85.04 | 70.88 | 28.62 | 47.34 | 62.08 | 87.64 | |
Na | Mean | 0.13 | 0.01 | 0.00 | 0.00 | 1.62 | 0.02 | 0.00 | 0.05 |
sd | 0.28 | 0.04 | 0.00 | 0.00 | 0.58 | 0.06 | 0.00 | 0.05 | |
Median | 0.00 | 0.00 | 0.00 | 0.00 | 7.73 | 0.00 | 0.00 | 0.00 | |
CV | 213.79 | 787.40 | NA | NA | 35.85 | 348.42 | NA | 469.04 | |
