NanoValid D.5.47 Annex 2: Inter-laboratory comparison on measurand Surface Charge (Zeta Potential) of 15 nm Lys-SNPs-B1 Silica Nanoparticles Particles

An inter-laboratory comparison on the surface charge, expressed as zeta potential ζ, of nanoscaled SiO2 has been performed using #14 BAM ~15 nm Lys-SNPs-B1 Silica nanoparticles (see D.5.41/5.42). The comparability of results delivered by participants has been tested.

The Task 5.4 of NanoValid is designed to test, compare and validate current methods to measure and characterize physicochemical properties of selected engineered nanoparticles. The measurand is Surface charge expressed as zeta-Potential. The measurements are to be accompanied by estimates of the uncertainties at a confidence level of 95%, deduced from the standard uncertainties. Therefore an uncertainty budget comprising statistical (Type A) and systematic (Type B) errors has to be established and delivered for the measurand.