| Estahbanadi and Fahrenfeld 2016 [118] | n.a | 0.028 to 0.44 MP/L | 250-500 | Primary and secondary | n.a. | Visual sorting, Microscope | USA |
| Kalčiková et al., 2017 [107] | n.a | 0.021 MP/L | 37 to 95 | Primary (Mechanical and Biological) | 87% | FT-IR | Slovenia |
| Simon et al., 2018 [113] | 7216 MP/L | 54 MP/L | 10 to 500 | - | 98.3% | FPA-FTIR | Denmark |
| Sutton et al., 2016 [92] | n.a | 0.086 MP/L | 125 | Primary and secondary | n.a. | Dissection microscope and Raman spectroscopy | USA |
| Michielssen et al., 2016 [100] | 133.0 MP/L | 5.9 MP/L | 20 | Primary and secondary | 93.8% | Visual sorting, Microscope | USA (Detroit) |
| Michielssen et al., 2016 [100] | 367 MP/L | 2.6 MP/L | 20 | Primary, secondary and tertiary | 97.2% | Visual sorting, Microscope | USA (Northfield) |
| Gies et al., 2018 [119] | 31.1 MP/L | 0.5 MP/L | 64 | Primary and secondary | 98.3% | Microscopy and FT-IR | Canada |
| Wisniowska et al., 2018 [120] | 19.4·103 to 552.2·103 MP/1 m3 | 0.028 to 0.96 MP/L | n.a. | n.a. | 95% - 99% | n.a | Poland |
| Yang et al., 2019 [121] | 12.03 MP/L | 0.59 MP/L | 50 | Primary and secondary | 95% | Microscopy and FT-IR | China (Beijing) |
| Bayo et al., 2019 [122] | 15.70 MP·L−1 | 0.25 MP/L | n.a | Primary | 90.3% | Microscopy and FT-IR | Spain (Cartagena) |
| Long et al., 2019 [123] | 1.57 - 13.69 MP/L | 0.20 - 1.73 MP/L | 28.3 | Primary and secondary | 97.8% | Visual sorting and micro-Raman spectroscopy | China |
| Blair et al., 2019 [111] | 3 and 10 MP·L−1 | <1 and 3 MP/L | 300 | Tertiary | 96% | FT-IR | UK |
| Xu et al., 2019 [124] | 196.00 MP/L | 9.04 MP/L | 1000 | Primary and secondary | 97.2% | ATR-FTIR | China (Changzhu) |
| Lv et al., 2019 [125] | 0.28 mp/L | 0.13 and 0.05 MP/L | 25 | n.a. | MBR 99.5%, | FTIR | China |
| Liu et al., 2019 [126] | 80 MP/L | 28.4 MP/L | 100 | Primary and secondary | 64.4% | Visual inspection and FTIR | China |
| Wolff et al., 2019 [127] | n.a | 59 and 30 MP/L | 10 | Primary and secondary | n.a | Raman spectroscopy | Germany |
| Conley et al., 2019 [112] | 147, 126, 146 MP/L | 3.7, 17.6 and 17.2 MP/L | 23 | Primary and secondary | 97.6%, 85.2%, 85.5% | Visual Observation and stereomicro- scope | USA |
| Magni et al., 2019 [115] | 2.5 MP/L | 0.4 MP/L | 8 | Primary, secondary and tertiary | 84% | FTIR | Italy |
| Ren et al., 2020 [108] | 16.0 MP/L | 2.9 MP/L | 0.08 - 0.55 mm | Primary, secondary and tertiary | 81.9% | Visual inspection and Microscope | China (Zhengzhou) |