Pollution Status And Risk Assessment Of Pesticides And Heavy Metals In Dezhou's Exported Vegetables

Food safety is one of the hottest topics in the world. Europe countries have established and formed a relatively perfect food supervision system for food safety supervision system. China's food safety supervision system has been set up in order to avoid lap or blind in the admination of food and drug.To protect the food safety, China has set up own food safety standards. China's standard on pesticide residues was left a big gap. The research and development of pesticide residues analysis technology is still a big problem. Therefore, in the relevant international trade, China's export of food is more likely to face the technical barriers of advanced importing countries, the economic losses caused by the increasing year by year, and the technical barriers of advanced countries have become the biggest obstacle to the development of China's foreign trade. For the Dezhou region, the main export vegetables are dried chili, mushroom and garlic products. For these vegetables pest aphids, mites, armyworm, otherwise all kinds of advantageous agricultural weeds, the main control measures in spraying pesticide. Pesticide residues and heavy metal residues exist in the process of the use of pesticides.Due to a number of risks and export activities, the slightest mistake will cause trade disputes between countries or regions. But the import and export of wide range of goods, a huge number, import and export inspection and quarantine departments impossible Pip inspection, import and export activities so commonly used method of risk assessment for risk of various commodities statistics and focus on monitoring high-risk goods.Based on the above analysis, this thesis is mainly divided into three parts, the main pesticide pollution in the export of vegetables and detection methods, the status of heavy metal pollution in vegetables and the detection method, the pesticide residues in vegetables and heavy metal residues in risk assessment. The main experimental results are listed as follows.Firstly, the vegetable pesticides residues were detected by gas phase chromatography and gas chromatography mass spectrometry. The 14 kinds of pesticides result in a corresponding national standard detection limits are not detected. But because of pesticide residues for governments to focus on monitoring the object, so it is needed to pay close attention.Secondly, through four kinds of vegetables for export heavy metals Pb, Cd, Hg and As. The results were listed as follows. First of all, the overall export of vegetables in Pb content is relatively high, and secondly, in order to distinguish the type of export vegetables, chili products average lead content of 151.30 ?g/kg, Cadmium average content of 82.08?g/kg, the mercury content of 81.02 ?g/kg, the total arsenic content of 77.56 ?g/kg; mushroom products average lead content of 152 ?g/kg, the average mercury content of 11.83 ?g/kg, in mushroom the average cadmium content of 8.50?g/kg, arsenic content 29.44?g/kg, the average content of cadmium garlic products for 26.04 ?g/kg, can be seen to deal with peppers and mushrooms products focus on monitoring of lead contamination.Thirdly, the content of heavy metals by comparing chili products, mushrooms and garlic products in the product, we can draw the following conclusions: Pb risk for dry mushroom > chili powder > canned mushroom > dried chili > thick chili powder > pickled peppers, garlic slice; the CD risk for garlic > thick chili powder, the risk of the two kinds of vegetables far outweigh other five, Hg risk for garlic > chili powder > pickled peppers > thick chili powder > pepper stem > dry mushroom, canned mushroom, the risk of arsenic for garlic > thick chili powder, the other five less risk.