Figure 2From: Hazard assessment of a silver nanoparticle in soil applied via sewage sludgeLong-term test 2 - inhibition of the nitrite production in comparison to the sludge control. *0.05 ≥ P ≥ 0.01; **0.01 ≥ P ≥ 0.001; ***P ≤ 0.001.Back to article page