Table 1.
Sample pretreatment before density separation and organic removal for MPs analysis in freshwater sediment.
| No. | Sampling site | Sample processing | Sample amounts | Ref. | ||
|---|---|---|---|---|---|---|
| Sieving | Drying | |||||
| Temperature (°C) |
Time | |||||
| 1 | Beijing river, China | N/A | 50 | 48 h | 30 g (DW) | (Wang et al., 2017) |
| 2 | Qinghai lake, China | 2 mm | N/A | N/A | N/A | (Xiong et al., 2018) |
| 3 | Yangtze river, China | N/A | N/A | N/A | 500 g (WW) | (Di and Wang, 2018) |
| 4 | Dongting lake, China | N/A | Freeze-drying | N/A | 50 g (DW) | (Jiang et al., 2018) |
| 5 | Huangpu river, China | N/A | 70 | N/A | 100 g (DW) | (Peng et al., 2018) |
| 6 | Antuã river, Portugal | N/A | 90 | 48 h | N/A | (Rodrigues et al., 2018) |
| 7 | Atoyac river, Mexico | N/A | <40 | N/A | 30 g (DW) | (Shruti et al., 2019) |
| 8 | Retention ponds, Denmark | 2 mm (wet-sieving), settle for a week, gather particles in the supernatant using a 10 μm STS filter, sonicate STS filter for 15 min, transfer the filtered particles back to the settled sediment | 50 (After pre-oxidation) | N/A | 50 g (WW; pre-oxidation) 200 g (DW; density separation) |
(Liu et al., 2019a) |
| 9 | Wei river, China | N/A | 70 | 24 h | 100 g (DW) | (Ding et al., 2019) |
| 10 | Kelvin river, Scotland | 2.8 mm, 2.0 mm, 1.4 mm, 1.0 mm, 0.71 mm, 0.5 mm, 0.355 mm, 0.25 mm, 0.18 mm, 0.125 mm, 0.09 mm and 0.063 mm, use an automatic shaker for 10 min | 100 | 24 h | 25 g (DW) | (Blair et al., 2019) |
| 11 | Rhine river, German | <2 mm, 2–5 mm, >5 mm | 60 | 4 days | 60 g (DW) | (Mani et al., 2019) |
| 12 | Poyang lake, China | N/A | 50 | 48 h | 500 g (DW) | (Yuan et al., 2019) |
| 13 | Ciwalengke river, Indonesia | N/A | 100 | 48 h | 100 g (DW) | (Alam et al., 2019) |
| 14 | Nakdong river, Korea | N/A | 60 | N/A | Determine by drying 100 g (WW) |
(Eo et al., 2019) |
| 15 | Ganga river, India | 63–850 μm, 850 μm–5 mm, 5–10 mm (mesoplastics) | 65 | 36 h | N/A | (Sarkar et al., 2019) |
| 16 | Auckland streams, New Zealand | N/A | N/A | Determine by drying the residue remaining after elutriation step of 1 L (WW) | (Dikareva and Simon, 2019) | |
| 17 | Ebro river, Spain | N/A | N/A | N/A | 10–20 g (DW) | (Simon-Sánchez et al., 2019) |
| 18 | Elbe river, German | Wet-sieving, 20–125 μm (dry at 45–55 °C for 5–7 days), 125–1000 μm (perform density separation), 1000–5000 μm (store for analysis) | 45 | 5–7 days | Determine by drying 200 g (WW) | (Scherer et al., 2020) |
| 19 | Changjiang estuary, China | N/A | 70 | 24 h | 100 g (DW) | (Peng et al., 2017) |
| 20 | Bohai bay river estuary, China | 0.9 mm | 60 | N/A | 200 g (DW) | (Han et al., 2019b) |
Note: DW (Dried Weight) and WW (Wet Weight).