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. Author manuscript; available in PMC: 2021 Oct 7.
Published in final edited form as: J Am Soc Mass Spectrom. 2020 Sep 17;31(10):2180–2190. doi: 10.1021/jasms.0c00278

Table 3.

Dissolved Metal Ion Concentration in MQ Water and SGF at Different Contact Timesa

dissolved metal ion concentration (μg/L)
in MQ Water at 23 °C
 in SGF at 23 °C
 in SGF at 37 °C
nanoparticle species contact time (min) 1 μg/Lb 10 μg/L 100 μg/L 1 μg/L 10 μg/L 100 μg/L 1 μg/L 10 μg/L 100 μg/L
40 nm Ag-NP    2 <LODc <LOD <LOD 0.60 5.77 28.78 0.66 6.14 39.89
   15 <LOD <LOD <LOD 0.75 8.07 28.96 0.99 8.42 42.76
   30 <LOD <LOD <LOD 1.00 8.46 29.37 1.02 11.07 45.75
   60 <LOD <LOD <LOD 0.92 9.77 36.98 1.04 10.61 74.79
   120 <LOD <LOD <LOD 0.94 10.04 37.81 0.97 11.24 75.96
   360 <LOD <LOD <LOD 0.99 10.64 54.96 0.94 11.38 78.61
70 nm Ag-NP    2 <LOD <LOD <LOD 0.45 3.1 19.33 0.51 4.32 25.76
   15 <LOD <LOD <LOD 0.75 6.47 23.77 0.99 9.95 43.22
   30 <LOD <LOD <LOD 1.07 8.87 27.64 1.03 10.16 46.40
   60 <LOD <LOD <LOD 1.11 9.44 29.31 1.11 11.40 46.95
   120 <LOD <LOD <LOD 1.05 11.18 29.51 1.10 11.16 50.26
   360 <LOD <LOD <LOD 1.04 11.21 43.93 1.14 11.75 70.54
40 nm Au-NP    2 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
   360 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
80 nm Au-NP    2 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
   360 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
30–50 nm CeO2-NP    2 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
   360 <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD <LOD
<100 nm ZnO-NP    2 0.79 7.78 54.00 1.17 9.08 84.21 1.13 11.50 113.64
   120 0.88 8.36 80.70 1.15 9.33 97.35 1.07 11.40 103.61
   360 1.09 10.64 98.26 1.15 9.53 99.22 1.14 11.67 110.39
80–200 nm ZnO-NP    2 0.82 3.71 45.15 1.10 11.03 114.04 NAd NA NA
   120 1.13 5.19 60.85 1.13 11.21 112.27 NA NA NA
   360 1.18 7.85 73.49 1.09 11.27 115.62 NA NA NA
a

Note: For Au- and CeO2-NPs, all the measured dissolved concentrations at different contact times (2, 15, 30, 60, 120, and 360 min) are lower than the detection limits. ZnO-NPs dissolve rapidly in SGF in a couple of minutes. Partial data are presented in the table.

b

Dosing concentration of ENPs into MQ water and SGF.

c

LOD means limit of detection of dissolved ions, which is shown in Table 2.

d

NA means not analyze.