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Table 4 Summary of WET-test results. Details on the method and results of the WET-tests conducted with runoff samples from highway E18, Sweden and highway A61, Germany and a surface water sample near highway A2, the Netherlands can be found in the technical reports [97,98,99]. Some endpoints are not available (n.a.), when effect parameters are too low to enable calculation. The concentration is expressed in % sample in test solution

From: Environmental risks of car tire microplastic particles and other road runoff pollutants

Test Endpoint Sample
Runoff, Germany Runoff, Sweden Surface water, the Netherlands
Bacteria Effect 8.68% effecta at highest conc. (45%) 7.06% effecta at highest conc. (45%) no effects
EC50 > 45% > 45% > 45%
NOEC n.a. n.a. n.a.
Algae Effect 84% effect at lowest conc. (31.6%) 35% effect at highest conc. (100%) 6% effecta at highest conc. (100%)
EC50 < 31.6% > 96% > 96%
NOEC < 31.6% 42.2% n.a.
Crustacea Effect 0% effecta in highest conc. (100%) 10% effect in highest conc. (100%) 10% effecta in highest conc. (100%)
EC50 > 100% > 100% > 100%
NOEC n.a. n.a. n.a.
  1. aWithin the normal range of variation for this test