Metadata field: filtration_upper_threshold_um
Studies:
- Bell_2018_groundwater (354 samples)
- Tremblay_2017_marine (202 samples)
- Liang_2020_river (114 samples)
- Gaffney_2019_marine_Doggerland (93 samples)
- 45 other studies (1439 samples)
Scope: ocean, environmental
Type: numeric
Description: For ocean water and freshwater samples: upper size cutoff for the filtration during sample collection, i.e. the pre-filter pore size in µm. The contents of this filter are discarded (or at least not sequenced in this particular size fraction).
Examples: 3, 0.2, but also Infinity (when there is no pre-filtering step)
| Value | Count |
|---|---|
| Infinity | 1057 |
| 5 | 178 |
| 20 | 127 |
| 3 | 99 |
| 1 | 91 |
| 10 | 88 |
| 2.7 | 78 |
| 50 | 77 |
| 300 | 72 |
| 1.6 | 65 |
| 1.2 | 47 |
| infinity | 38 |
| 20.0-25.0 | 30 |
| 126 | 21 |
| 180 | 9 |
| 0.22 | 5 |
| 0.7 | 5 |
| 27 | 2 |
| 64 | 1 |