The OECD publish new Guidance Documents
The OECD have recently release new guidance documents covering nanomaterials, they are free to access online.
No. 318 GD for the Testing of Dissolution and Dispersion Stability of Nanomaterials, and the Use of the Data for Further Environmental Testing and Assessment (Excel) can be viewed HERE
No. 317 GD on Aquatic and Sediment Toxicological Testing of Nanomaterials can be viewed HERE