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Table 3 Proposed microplastics toxicity thresholds for tissue translocation, relevant for particle sizes between 1 and 83 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”
60a 10a
Threshold 2-
“Discharge monitoring”
312 (57 to 4680) 51 (10 to 770)
Threshold 3-
“Management planning”
890 (118 to 19,000) 146 (19 to 3120)
Threshold 4-
“Source control measures”
4110 (493 to 69,100) 676 (81 to 11,400)
  1. aThreshold 1 is the lower 95% CI of the HC5 calculated for Threshold 2, therefore confidence intervals cannot be reported for this threshold