Sodium dimethyl arsenate.
Cacodylic acid -sodium salt. This solution is prepared from ACS reagent grade sodium hydroxide. It is standardised colourmetrically against potassium biphthalate as primary reference material. M.S.D.S C201 2N Sod. 2H 2 O F.W. 329.86 Stocker, J. C., Sodium Tungstate as a stain in Electron Microscopy .