The hydrogen peroxide treatment of fibre during defibration
produced an additional reduction in the pH. The analysis
showed a pH level very close to pH 3 and consequently a
minor amount of titration solution was required to reach the
required value. The lowest pH value (pH 3.2) and the least
amount of titration solution (1.8 ml) were observed after acid
pre-treatment of the straw in combination with the addition
of 4.0% hydrogen peroxide to the processed fibres (trials RB
and RC).