Table 1.
Information for diatomaceous earth samples, including: particle size distribution, surface area and chemical composition
| Sample information | Particle size distribution (c.v. %) | BET surface area (m2/g) | Chemical composition (wt.%) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sample ID | Source | Process | Grade | <4 μm | <10 μm | Mean | s.d. | SiO2 | TiO2 | Al2O3 | Fe2O3 | MgO | CaO | Na2O | K2O |
| DE_05#a | Spain | U | Filler | 11.3 | 38.8 | 7.5 | 0.7 | 90.47 | 0.05 | 0.91 | 0.38 | 0.34 | 6.96 | 0.65 | 0.14 |
| DE_11b | Spain | U | Filler | 12.4 | 47.3 | 6.3 | 0.4 | 87.26 | 0.05 | 1.40 | 0.42 | 0.49 | 8.96 | 1.04 | 0.17 |
| DE_13c | France | U | Filter aid | 7.8 | 28.0 | 22.9 | 0.2 | 89.02 | 0.64 | 4.42 | 3.22 | 0.36 | 0.66 | 0.38 | 0.35 |
| DE_15d | France | U | Filter aid | 7.9 | 28.5 | 23.8 | 0.3 | 87.40 | 0.70 | 4.73 | 3.99 | 0.49 | 0.74 | 0.19 | 0.34 |
| DE_16d | France | C | Filter aid | 6.7 | 25.0 | 3.8 | 0.1 | 88.03 | 0.66 | 4.50 | 3.86 | 0.39 | 0.66 | 0.17 | 0.33 |
| DE_18 | China | C | Filter aid | 7.3 | 28.1 | 3.1 | 0.1 | 93.49 | 0.15 | 3.71 | 1.67 | 0.35 | 0.08 | −0.04 | 0.50 |
| DE_20# | Mexico | C | Filter aid | 6.8 | 25.3 | 4.0 | 0.1 | 92.00 | 0.24 | 5.07 | 1.95 | 0.34 | 0.30 | −0.13 | 0.20 |
| DE_21 | USA-1e | C | Filter aid | 6.2 | 21.7 | 5.7 | 0.2 | 87.83 | 0.32 | 6.57 | 1.81 | 1.02 | 0.54 | 0.51 | 1.02 |
| DE_22 | USA-1 | C | Filler | 25.4 | 71.5 | 10.6 | 0.2 | 93.24 | 0.17 | 3.82 | 1.15 | 0.65 | 0.17 | 0.03 | 0.59 |
| DE_23 | USA-1 | C | Filter aid | 21.8 | 65.5 | 6.8 | 0.2 | 93.88 | 0.15 | 3.03 | 1.05 | 0.69 | 0.30 | 0.21 | 0.47 |
| DE_24# | Mexico | C | Filter aid | 12.1 | 45.0 | 5.9 | 0.2 | 93.63 | 0.19 | 3.89 | 1.49 | 0.33 | 0.22 | 0.01 | 0.18 |
| DE_06a | Spain | FC | Filler | 8.5 | 34.4 | 1.1 | 0.1 | 91.27 | 0.03 | 0.67 | 0.35 | 0.27 | 6.25 | 1.00 | 0.09 |
| DE_07 | USA-1 | FC | Filler | 10.6 | 31.6 | 1.3 | 0.0 | 91.67 | 0.15 | 3.00 | 1.07 | 0.53 | 0.29 | 2.69 | 0.48 |
| DE_08# | USA-2e | FC | Filler | 9.2 | 28.7 | 1.3 | 0.1 | 93.07 | 0.06 | 1.12 | 1.99 | 0.51 | 0.30 | 2.89 | 0.03 |
| DE_09 | Chile | FC | Filler | 9.8 | 33.4 | 1.5 | 0.1 | 93.04 | 0.10 | 1.82 | 0.95 | 0.23 | 1.29 | 2.15 | 0.34 |
| DE_10# | Mexico | FC | Filler | 8.7 | 35.3 | 1.7 | 0.1 | 93.64 | 0.10 | 2.05 | 0.80 | 0.14 | 0.32 | 2.59 | 0.12 |
| DE_12b | Spain | FC | Filler | 8.5 | 33.4 | 1.0 | 0.1 | 90.67 | 0.03 | 1.12 | 0.35 | 0.31 | 6.64 | 0.69 | 0.10 |
| DE_14c | France | FC | Filter aid | 6.4 | 17.0 | 1.1 | 0.1 | 87.36 | 0.58 | 4.10 | 2.61 | 0.40 | 0.62 | 3.17 | 0.39 |
| DE_17 | China | FC | Filter aid | 4.6 | 11.4 | 1.0 | 0.0 | 91.68 | 0.13 | 3.12 | 1.44 | 0.27 | 0.11 | 2.22 | 0.51 |
Table sorted by process: U unprocessed, C calcined, FC flux-calcined, c.v. cumulative volume, s.d. standard deviation (n = 3). #The fine fractions of these samples were separated for use in toxicology assays. e Samples were sourced from two separate deposits in the USA and so are denoted as USA-1 and USA-2.a–d Unprocessed samples and their corresponding processed samples