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Table 5 Effect of TiO 2 and silver nanoparticles on microbial ammonium oxidation activity

From: Influence of application techniques on the ecotoxicological effects of nanomaterials in soil

Test concentration [mg/kg]1

Ag nanoparticles Microbial ammonium oxidation activity ± SD2[ng/(g * h)]1

TiO2nanoparticles Microbial ammonium oxidation activity ± SD2[ng/(g * h)]1

0 (control)

50.9 ± 8.3

25.7 ± 5.6

10 mg/kg via soil

47.0 ± 3.6

23.6 ± 1.0

10 mg/kg via silica sand

50.4 ± 6.3

24.5 ± 1.8

100 mg/kg via soil

3.0 ± 0.9 *

18.8 ± 2.7 *

100 mg/kg via silica sand

15.9 ± 3.7 *

26.1 ± 7.3

  1. 1 All concentrations refer to soil dry mass. 2 SD: standard deviation. Asterisks indicate a statistically-significant difference (significance α = 0.05; one-sided, Williams multiple sequential t-test).