The effect of particle size on biodegradation rate was determined
by comparing the biodegradability of 1 cm squares to
ground samples. Samples were ground in liquid nitrogen using a
IKA A11 basic Analytical mill (IKA Works Inc., NC, U.S.) for 10 s.
Test specimens included PP þ 2% additive, co-polyester þ cornbased
plastic, wheat starch-derived plastic, paper pulp, paper
pulp þ asphalt, coconut coir and rice hull (Tables 2 and 3). Samples
were incubated in triplicate for 660 days.
Table
was not exceeded. The KOH traps were refilled at a rate dependent
on the rate of CO2 generation in each flask. At the time of removal of
the traps, the vessel was flushed and allowed to sit open to allow
fresh air to fill the headspace. In addition, distilled water was added
to the soil to the original weight to maintain adequate moisture.
sealed and incubated at room temperature (20 2 C).
specimen.
in triplicate for a period of 660 days.