It is not easy to check the safety of all fruits and vegetables! The Taipei Agricultural Products Transportation and Marketing Corporation (Bei Nong) alone can handle about 1,500 tons of vegetables in a single day. Taiwan eats so many fruits and vegetables every day. How does it manage? At present, the domestic agricultural production center adopts a random sampling method, and takes some samples from a large number of fruits and vegetables to test the pesticide residues. Sometimes the unqualified rate of pesticide residues can reach 10% . Even in 2021, the Consumer Protection Department of the Executive Yuan will sample online shopping.
The results of pesticide residues in vegetable products are even more alarming, with a failure rate of 30%. One of the green onion products has a pesticide exceeding the standard by 36 times . In 2022, the Consumer Foundation will randomly test imported industry email list strawberries and local strawberries. up to 50% . This kind of situation is really uncomfortable, and it is very necessary to carefully examine and check. So, what method is used to test the pesticide residues in fruits and vegetables? At present, the commonly used rapid detection methods for pesticides (quick screening methods) can be divided into biochemical methods, Raman spectroscopy, and mass spectrometry fast screening methods.
The biochemical method with the longest history is currently the most common quick screening method in major markets and mass retailers in China. This method is fast and cheap, but it has low specificity for pesticides and can only detect more than 30 kinds of pesticides. There are more and more types of pesticides and more complex brands. The Raman spectroscopy and mass spectrometry screening methods introduced next are new technologies that replace biochemical methods. Raman spectroscopy uses a Raman scatterometer for detection, which has the advantage of being fast, but the disadvantage is that the false positives are high, and the specificity is not as good as that of the mass spectrometry quick screening method.