Journal of Nanomaterials / 2015 / Article / Tab 1

Research Article

Acute Toxicity of Double-Walled Carbon Nanotubes to Three Aquatic Organisms

Table 1

Growth inhibition (EC50s and 95% confidence intervals) for Pseudokirchneriella subcapitata following 72 h exposure to pristine and oxidised DWCNTs at different ionic strengths and humic acid (HA) concentrations. EC50s with common alphabetical superscript do not differ significantly ().

ExposurePhysicochemical characteristicsEC50 (mg/L)Confidence limits (mg/L)

Pristine0.00335 (control reconstituted water) M Na17.95a9.8–26.72
0.00585 M Na29.47a22.95–37.65
0.00835 M Na30.89a18.06–40.4
0.0139 M Na52.31b33.96–76.1

Oxidised0.00335 (control reconstituted water) M Na10.93a6.71–15.59
0.00585 M Na27.22a19.56–38.9
0.00835 M Na16.11a11.59–22.42
0.0139 M Na49.31b27.24–58.89

Pristine0.00449 M Ca23.26a17.04–28.00
0.0226 M Ca25.57a16.07–34.93
0.0339 M Ca31.52a21.56–50.92

Oxidised0.00449 M Ca22.86a15.59–42.42
0.0226 M Ca22.91a12.95–40.89
0.03395 M Ca24.61a13.37–34.44

Pristine0 (control reconstituted water) M Na17.95b9.80–26.72
0.9 mg/L HA22.75a14.39–31.70
1.81 mg/L HA26.56a10.95–34.61
3.64 mg/L HA31.65a10.87–42.19

Oxidised0 (control reconstituted water) M Na10.93a6.71–15.59
0.9 mg/L HA13.59a8.71–21.19
1.81 mg/L HA18.01a16.71–24.93
3.64 mg/L HA20.56a6.58–34.15

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