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Table 2 Experiment 1; EC 50 for nitrate accumulation and potential ammonium oxidation activity over the incubation period

From: The potential benefits and limitations of different test procedures to determine the effects of Ag nanomaterials and AgNO3 on microbial nitrogen transformation in soil

Test substance Sampling time N-transformation with lucerneaEC50[mg/kg] N-transformation with (NH4)2SO4aEC50[mg/kg] Potential ammonium oxidationaEC50[mg/kg] C-transformation EC50[mg/kg]
NM-300Kb Day 7 10.1 [4.1 to 1,048] 22.4 [11.1 to 402.3] 2.3 [n.d.] 2.0 [n.d.]
Day 21 >15 7.1 [4.9 to 11.4] Not determined Not determined
Day 28 >15 7.3 [5.1 to 11.5] 1.6 [0.5 to 4.8] 5.0 [n.d.]
NM-302c Day 7 >100 190 [165 to 226] >100 >100
Day 21 >100 60.7 [51.6 to 71.6] 19.4 [17.4 to 21.8] 24.7 [n.d.]
Day 28 >100 44.6 [41.2 to 48.5] 6.0 [n.d.] 67.5 [n.b.]
AgNO3b Day 7 2.5 [1.1 to 5.8] 2.7 [n.d.] 3.8 [n.d.] Approximately 15d
Day 21 33.9 [n.d.] 2.5 [1.5 to 2.6] Not determined Not determined
Day 28 >15 2.8 [2.6 to 3.1] 2.9 [2.7 to 3.2] >15
  1. aConfidence interval shown in square brackets; bfive test concentrations; spacing factor of 3; cscreening approach: three test concentrations; spacing factor of 10; d50% inhibition at highest test concentration (15 mg/kg). n.d., not determinable.