孩子們以中國的食品為題材,在2000多個參賽項目中脫穎而出,將要去華盛頓參加國際的science fair。
在與上海食品安全實驗室的合作中,對有被最敏感的農藥污染可疑的蔬菜水果測試了138種已知農藥,重金屬,細菌污染,和比較其營養(yǎng)成分。
有趣的結果是,當?shù)夭耸袌龊统械臉悠范加写竽c菌群污染。然而,超市的樣品比菜市場的樣品含有更多的重金屬污染。整體來說只有6種農藥被分別在超市和本地市場的樣本檢測。
一個令人吃驚的結果是,雖然超市的草莓比菜市場的草莓多含草莓異菌脲(殺菌劑)高達330倍以上,但是超市蔬菜和菜市場蔬菜的營養(yǎng)成分幾乎一樣。這幫助我們了解菜市場的產(chǎn)品比超市產(chǎn)品更少污染。
地產(chǎn)地消(本地生產(chǎn)本地消費)是減少全球運輸中的二氧化碳增加,促進當?shù)亟?jīng)濟,更省錢而更健康的消費方式。
What does the US Army and a group of middle/high schoolers across the world have in common? I’ll tell you. It’s “Ecybermission” — an online science fair that is sponsored by the US Army for students in grades 6–9 in order to promote STEM: science, technology, engineering, and math-based learning.
We were the first international school to ever participate in this competition, which began 10 years ago. There were over 2,000 project submissions across the world. Our team, Team RADIANS, was selected as the one of the top 16 teams and will now travel to Washington, DC, to compete for the national title.
To compete in Ecybermission, teams must first think of a problem in their community. They must then use the principles of STEM to solve this problem. The challenge that Team RADIANS chose to tackle was the issue of general mistrust of Chinese-branded food products. A prevalent question in the Shanghai community is whether to buy fruits and vegetables at the local Chinese “wet market,” where the produce is cheaper and presumably fresher, or from the international supermarkets.
The team chose fruits and vegetables from the “dirty dozen list” — which means they are most susceptible for pesticides. In collaboration with a food safety lab in Shanghai, we tested the selected fruits and vegetables for exposure to 138 known pesticides, heavy metals, and bacterial contamination, and also compared their nutritional content.
The results from these tests were very interesting. The results indicate that the samples from the local markets and the supermarkets were both contaminated by Coliform bacteria. The samples from the supermarket, however, contained more heavy metals than those from the wet market. And overall, of the 138 different pesticides tested for, only six were detected on samples from both the supermarket and the local market. One surprising result, though, was that strawberries from the supermarket contained about 330 times more Iprodione (a fungicide) than the strawberries from the local market. The test results also showed that there was no nutritional difference between the produce fom the two types of markets.
These results helped the team conclude that the nutritional value of the produce was the same and that the produce from the local market is less contaminated than that from the supermarkets.
The team hopes that these results will encourage the community to shop at the local market knowing that, according to our tests, the produce is safer than produce from the supermarket. Consuming locally cultivated produce is a small step that will result in big returns for your health and globally, by reducing the carbon footprint caused by mass transportation. This trend will boost the local economy and you will save money at the same time. It’s a step forward to adopting a “green” lifestyle in Shanghai.
By Shri Chander, parent / team advisor, Pudong campus