Dunham, "Permselective membrane
fouling during azo dye wastewater treatment," Clean-Soil, Air, Water, vol.
They include the use of dual electrodes for background correction, low applied potential, and permselective membrane films that provide attenuated molecular diffusion of the suspect compounds (1-5).
(c) Another approach is to use a hydrogel formulated with phenolic additives (such as parabens), glucose oxidase, and buffer salts to form a permselective membrane film in situ, just before glucose detection.
The polymers that have been used for ethanol permselective membranes
include polydimethylsiloxane (PDMS) [9,10], poly[1-(trimethylsilyl)1-propyne] (PTMSP) [11, 12], in which PTMSP suffers from unstable PV performance with time.
Permselective membranes of Pd or Pd-based alloys can remove [H.sub.2], thus serving dual objectives: enhancing the hydrocarbon conversion by favourably shifting the equilibrium conversion, and producing a stream of pure [H.sub.2] as permeate (Adris et al., 1991, 1997; Grace et al., 2005).
In situ permselective membranes should be able to produce ultra-pure hydrogen as required by some sectors like the fuel cell industry.