李海畅毕业论文设计 (自动保存地).doc

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分类号： O657
论文编号： 2010021252 2010021252
密 级：
某某大学
2013届硕士研究生学位论文on while polluting the environment also affects the amount of import and export of pepper seriously. This paper identified the most monly applied pesticides in Guizhou pepper and made a statistical value of maximum residue limits of the pesticides in each countries or region, aslo astabished a pre-treatment and chromatographic method for the detection of multiresidue of pesticides on pepper of Guizhou province.


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QuEChERS, which stand for puickly, easy, cheap, effective, rugged and safe has many advantages as a pre-treatment method for multiresidue pesticide. The article reviews QuEChERS method bined with a variety of testing instruments applications in a variety of different matrix in recent years and establishes the improved QuEChERS pretreatment methods to the detection of multiple pesticide residues in pepper.
The pepper samples using GC-MS equipped with a HP-5 column, GC-ECD with a HP-1 column for the detection. Acetonitrile was used to prepare the standard solution and heptachlor epoxide used as an internal standard. In the concentration range of ~ μg/mL the stansard solutions show good linear relationship. Extraction was performed with 20 mL acetonitrile withultrasound. Primary secondary amine (PSA) and octadecylsilyl (C18) shown purify efficiently. The results show that: method recoveries×10-9~×10-9 g. The date demonstrates that this method was successfully used for analysis of 41 pesticides in Guizhou peppers.
Key words: Pepper; pesticides; QuEChERS; GC-MS; GC-ECD


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前言
辣椒现已成为一种世界性的仅次于豆类、番茄的第三大蔬菜作物。在中国，辣椒是仅次于大白菜的第二大蔬菜作物。中国的辣椒总产量居世界之首，年产2800多万吨。全省山多林茂，气候温和湿润，各地都适宜栽培辣椒，辣椒种植面积占全国的12%，纳入规划的重点产区有25个县〔市、区〕，特别是虾子镇、绥阳、花溪党武、乌当、独山、大方、织金等地，种植面积在2000万亩左右。品种也很丰富，有朝天椒、皱椒、小山椒、灯笼椒、长条椒等。辣椒总产量中10%用于辣椒制品加工、20%用于农户家庭自身消费外，70%左右的辣椒以初级产品的形式销往全国各地出口。
在辣椒生长过程中，从开