不同浓度铅及铅与EDTA螯合对小白菜品质的影响.docVIP

河　南　科　技　学　院 2011届本科毕业论文(设计) 不同浓度铅及铅与EDTA螯合对小白菜品质的影响 学生姓名： 所在院（系）：资源与环境学院 所学专业：农业资源与环境 导师姓名： 完成时间： 不同浓度铅及铅与EDTA螯合对小白菜品质的影响 摘要 通过盆栽试验，研究了不同浓度的重金属铅对小白菜品质的影响，以及加入螯合剂EDTA后重金属铅对小白菜品质的影响。结果表明：单一重金属铅在0-500 mg·kg-1范围内随着浓度的增大，小白菜叶片可溶性糖、维生素C的含量呈现先增加后减少的趋势，并且当重金属铅的浓度为50mg·kg-1时，小白菜叶片中可溶性糖、维生素C的含量达到最大值；而小白菜叶片粗纤维的含量呈现线性增大的趋势。EDTA与重金属铅同时处理小白菜时，小白菜叶片可溶性糖、维生素C的含量呈现先升高后减少的趋势，而粗纤维的含量整体上小于单一重金属铅处理。并且，当EDTA与铅的浓度比为1.5：1的时候， 小白菜叶片中可溶性糖的含量达到最高，当EDTA与小铅的浓度比为4：3的时候，小白菜叶片中维生素C的含量达到最高。说明重金属铅在一定范围之内能够显著降低小白菜的品质，螯合剂EDTA在一定范围之内能够降低重金属铅对小白菜叶片的毒害作用，从而能够影响到小白菜的品质。 关键词：铅，EDTA，小白菜叶片，可溶性糖，粗纤维，维生素C The Influence on Pakchoi Quality in Different Concentration of Pb and Chelated Pb by EDTA Abstract Through experiments, the pot of different concentrations of heavy metal Pb the influence of pakchoi, and join the quality chelating agent of heavy metal Pb after EDTA pakchoi quality influence. Results show that: a single heavy metal Pb within the increase of concentration 0-500 mg穔g-1 , with pakchoi leaf soluble sugar, vitamin C content presented the first increases, then declining trend, and when the concentration of heavy metal Pb 50mg · kg -1for the pakchoi , the contents of soluble sugar, vitamin C content reaches maximum; And the content of pakchoi leaf crude fibre present linear increase trend. EDTA and heavy metal Pb pakchoi, handle pakchoi leaf soluble sugar, vitamin C content presented after the first rise trend, and reduce the content of crude fibre whole smaller than single heavy metal Pb processing. And, when EDTA and Pb concentrations than for 1.5:1, pakchoi leaf in the content of soluble sugar, when the highest concentrations of small Pb with EDTA, than for 4:3 pakchoi leaf in vitamin C content was the highest. Explain in certain limits heavy metal Pb to significantly reduce the quality of pakchoi, chelating agent in certain limits EDTA of heavy metal Pb to reduce the toxicity of pakchoi leaf, which can affect the quality of pakchoi. Key words: Pb, EDTA, Pakchoi, Soluble sugar, Crude