Skip to main content

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.