2. Materials and Method
2.1 Instrumentation
Hotplate stirrer (HAMONY LMS-1003, Japan) was used for
evaporation of ammonia in NR latex sample. For the sample
digestion, a thermoreactor (VELP-ECO 16 COD Thermoreactor,
Italy) was employed and the phosphate residue was determined
by using double beam UV-Visible spectrophotometer (V-650
Series Spectrophotometers, Jap