Can anyone suggest a technique to enumerate bacteria in a colloidal
silica solution. The solution is composed of colloidal silica (15 nm
particle size) in water containing an amine. The pH is 10 and the
solution has a susdsy appearance when shaken. The concentration of
silica is 0.5%. We are interested in techniques to enumerate any
bacteria present in the slurry using epifluorescence or culturing methods.
The solution will rapidly clog a 0.2 u membrane filter.
Pacific Analytical Laboratory
e-mail: PAL at proaxis.com