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Table 2 Proposed microplastics toxicity thresholds for food dilution, relevant for particle sizes between 1 and 5000 μm

From: Risk-based management framework for microplastics in aquatic ecosystems

Threshold Particles/L (95% CI) Mass (mg)/L (95% CI)
Threshold 1-
“Investigative monitoring”
0.3a 0.05a
Threshold 2-
“Discharge monitoring”
3 (0.3 to 66) 0.4 (0.05 to 11)
Threshold 3-
“Management planning”
5 (0.4 to 219) 0.9 (0.07 to 36)
Threshold 4-
“Source control measures”
34 (3 to 859) 6 (0.4 to 141)
  1. aThreshold 1 is the lower 95% CI of the HC5 calculated for Threshold 2, therefore confidence intervals cannot be reported for this threshold