persulphate for NR latex digestion. It was studied in the range of
10 – 80 gL-1
with thermoreactor at 100 °C for 60 min. From this
figure, the maximum absorbance ratio showed at 20 gL-1
.
However, the resultant solution was not clear enough. Therefore,
filtration procedure before color developing was used. It was
found that when the concentration of oxidizing agent was more
than 20 gL-1
, the NR particles and other organic substances in
the latex were decomposed so the clear solution was obtained.
Thus, in this work, the concentration of oxidizing agent at 30 gL-1
was selected because it showed high absorbance ratio with clear
solution which suitable for color developing by molybdenum blue
method.