Measurement of Redox Potential in Nanoecotoxicological Investigations

Table 1

Redox potential of nanomaterial dispersion in various liquid media; the value quoted (in mV) is relative to the standard hydrogen reference electrode. The values in bracket show the difference in value with respect to the corresponding blank liquid media.

Sample name	Redox potential (mV) of nanomaterial dispersions
	DI water	Fish medium	Seawater	Daphnia medium
Liquid media with no nanomaterials	405	418	384	425
Nanograin CeO2 (Umicore Belgium)	416 (11 mV)	439 (21 mV)	384 (0 mV)	415 (−10 mV)
Nanosun ZnO (Micronisers, Australia)	398 (−7 mV)	424 (6 mV)	380 (−4 mV)	415 (−10 mV)
Micron ZnO (Sigma Aldrich, UK)	398 (−7 mV)	430 (12 mV)	374 (−10 mV)	415 (−10 mV)
Z-COTE ZnO (BASF, Germany)	396 (−9 mV)	427 (9 mV)	379 (−5 mV)	422 (−3 mV)
Micron CeO2 (Sigma Aldrich, UK)	422 (17 mV)	430 (12 mV)	382 (−2 mV)	429 (4 mV)
Ceria dry CeO2 (Antaria, Australia)	414 (9 mV)	436 (18 mV)	387 (3 mV)	426 (1 mV)