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采用高效液相色谱和气相色谱法,分别研究了吡虫啉和百菌清在薄膜大棚设施内外葫芦叶和黄瓜中消解动态及其在葫芦和黄瓜中的残留量,并结合气象因子对产生残留差异的原因进行了分析。样品中的吡虫啉经乙腈和盐酸溶液提取,中性氧化铝和弗罗里硅土层析柱净化后,用高效液相色谱检测;百菌清经乙腈提取,中性氧化铝层析柱净化后,用气相色谱检测。结果表明:吡虫啉在设施内外葫芦叶和黄瓜中均消解迅速,施药7 d后,其在设施内外葫芦叶上的消解率分别为90.4%和98.7%,在黄瓜中的消解率分别为67.8%和85.9%;而百菌清在葫芦叶上的消解速率均比在黄瓜中的稍慢,施药7 d后其在设施内外葫芦叶上的消解率分别为15.4%和38.1%,在黄瓜中的消解率分别为87.8%和91.5%。表明2种农药在设施外2种蔬菜上的消解速率均快于设施内的。两种农药均是在设施外葫芦及黄瓜中的残留量低于设施内的,而降雨和光照强度可能是引起农药在设施内外蔬菜上残留差异的主要因子。
The effects of imidacloprid and chlorothalonil on the internal and external hyacinth leaves and cucumbers and their residues in cucurbits and cucumbers were studied by high performance liquid chromatography and gas chromatography. Meantime, The reason is analyzed. Imidacloprid in the sample was extracted with acetonitrile and hydrochloric acid solution, purified by neutral alumina and Florisil, then detected by high performance liquid chromatography (HPLC); chlorothalonil was extracted by acetonitrile and purified by neutral alumina column , Detected by gas chromatography. The results showed that imidacloprid was rapidly digested rapidly both inside and outside the cucurbits and cucumbers. After 7 days of application, the digestion rates of imidacloprid were 90.4% and 98.7% in cucurbits respectively. The digestion rates in cucumber were 67.8% And 85.9%, respectively; while the chlorothalonil removal rate of chlorothalonil was slower than that of cucumber, the digestion rates of chlorothalonil and chlorothalonil were 15.4% and 38.1% respectively in the cucumber The resolution rate was 87.8% and 91.5% respectively. The results showed that the digestion rate of the two pesticides on the two vegetables outside the facility was faster than that of the two facilities. Both pesticides were lower in the gourd and cucumber than in the facility, and rainfall and light intensity were likely to be the major contributors to pesticide residues in the vegetable inside and outside the facility.