Decomposition of bio-degradable plastic spoons
The hypothesis that biodegradable spoons lose some of their weight after as little 4 weeks in the soil, is proven to be correct. At 30 days, it was evident that the corn starch-based spoons and the wheat-based spoons had begun to decompose, but this was not the case for the plastic spoons.
More than 20 million tons of plastic materials are produced around the globe every year. Out of these, only a small percentage are recycled. The difficulty faced in the recycling of plastic material is that most plastic waste matter comes mixed together with other types organic wastes. The process of separating the plastic from organic waste is time consuming and costly. However, in the case of bio-degradable plastics, the presence of organic waste actually aids the process of decomposition! Bio-degradable plastics may be a good alternative to regular plastic, in order to prevent the pollution of our environment.
Try to repeat this science fair project, this time, evaluating different environments for decomposition, such as by immersing the plastic in lake water or vegetable oil.
You could also try repeating the science project with other types or brands of biodegradable spoons, or by introducing specific species of bacteria into the soil.
Biodegradable plastic - http://en.wikipedia.org/wiki/Biodegradable_plastic
Biodegradable, compostable spoons - http://www.ecowise.com/product_info.php?products_id=536
Basic safety requirements