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中国农学通报

中国农学通报 ›› 2010, Vol. 26 ›› Issue (16): 84-89.

所属专题： 水稻

• 农学 农业基础科学 • 上一篇    下一篇

ECD气相色谱法对苯醚甲?丙环唑乳油在水稻上的残留研究

丁孟 杨仁斌   

  • 收稿日期:2010-03-22 修回日期:2010-04-27 出版日期:2010-08-20 发布日期:2010-08-20
  • 基金资助:
    农业部农药残留项目“苯醚甲?丙环唑乳油在水稻上的残留试验”

Research on Difenoconazole?Propicondzole EC Residue in Rice by ECD Gas Chromatography

  • Received:2010-03-22 Revised:2010-04-27 Online:2010-08-20 Published:2010-08-20

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摘要： 采用GC法研究了湖南、浙江和吉林三地苯醚甲?丙环唑乳油在水稻植株、水样以及土壤中的残留动态。样品用丙酮提取，二氯甲烷萃取，气相色谱仪检测。结果表明：苯醚甲环唑在植株、水样和土壤中的添加回收率为84.3％~97.9％，变异系数分别为2.89％~6.78％；丙环唑在植株、水样和土壤中的添加回收率为83.6％~104.7％，变异系数分别为4.02~6.57％。测定方法对水样、土壤、植株中的苯醚甲环唑最低检出浓度分别为0.002、0.01、0.02mg/kg，丙环唑最低检出浓度分别为0.001、0.005、0.01mg/kg。苯醚甲环唑在三地的稻田植株中的半衰期为6.92~13.66天，水样中的半衰期为0.37~0.76天，土壤中的半衰期为23.98~33.49天；丙环唑在稻田植株中的半衰期为2.55~6.31天，水样中的半衰期为0.28~4.33天，土壤中的半衰期为17.59~35.91天。建议我国对水稻中苯醚甲环唑和丙环唑的MRL值都暂定为0.10mg/kg。在中国自然环境条件下用苯醚甲?丙环乳油施药4次，收获的稻米食用是安全的。

关键词: 土壤, 土壤, 微生物群落, 磷脂脂肪酸, Perl, R

Abstract: The residual dynamics of Difenoconazole and Propiconazole in rice plant, soil, water samples, experiments conducted in Hunan ,Zhejiang and Jilin Province, were studied by ECD Gas Chromatography．Samples were extracted with acetone and dichloromethane, followed by determination using ECD GC. The result showed that the recovery rate of Difenoconazole were 84.3％~97.9％ for the rice plant, the water and the soil samples with coefficients of variation of 2.89％6.78％; and that of Propiconazole were 83.6％~104.7％for the rice plant, the water and the soil samples with coefficients of variation of 4.02％~6.57％. The minimum detectable concentration of Difenoconazole was 0.002mg/kg for water samples, 0.01mg/kg for soil samples and 0.02mg/kg for rice plant; and that of Propiconazole was 0.001mg/kg for water samples, 0.005mg/kg for soil samples and 0.01mg/kg for rice plant. Three experiments conducted, the degradation half-life of Difenoconazole within the rice plant was 6.92~13.6days, within the water samples was 0.37~0.76 days and within soil samples was 23.98~33.49days， respectively; and that of Propiconazole within the rice plant was 2.55~6.31days ,within the water samples was 0.28~4.33 days, and within soil samples was 17.59~35.91days, respectively. The MRL values of Difenoconazole and Propiconazole were all sdvised to being setted to 0.10mg/kg. Difenoconazole and Propiconazole was not detectable in ripe rice with once prescription of Difenoconazole?Propicondzole EC in the condition of Chinese natural environment