目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)同时测定衢枳壳中33种农药和代谢物残留的分析方法。方法样品经改良的QuEChERS方法提取净化后,在多反应监测模式下进行GC-MS/MS分析,内标法定量。...目的建立气相色谱-串联质谱法(gas chromatography-tandem mass spectrometry,GC-MS/MS)同时测定衢枳壳中33种农药和代谢物残留的分析方法。方法样品经改良的QuEChERS方法提取净化后,在多反应监测模式下进行GC-MS/MS分析,内标法定量。结果在优化实验条件下,33种测定物质均在0.01~0.50 mg/L范围内线性关系良好,方法定量限为0.01~0.10 mg/kg;在1.0倍、2.5倍和5.0倍定量限加标水平下,除内吸磷-O和内吸磷-S之外,其他农药和代谢物平均回收率均大于63%,相对标准偏差小于16%。结论该方法样品前处理简单、快速,检测结果准确,适用于衢枳壳中多种禁用农药残留的快速筛查和确证。展开更多
This article expounds the economic characteristics of circular agricultural technology.Since the circular agricultural technology has characteristics and externality of public goods,the government participation is nec...This article expounds the economic characteristics of circular agricultural technology.Since the circular agricultural technology has characteristics and externality of public goods,the government participation is necessary in building the technology system of circular agriculture,in order to avoid "free rider" behavior in the consumption of public goods and internalize externality.We analyze the orientation of government's role in building the technology system of circular agriculture:the government is the leader,designer,organizer and regulator in building the technology system of circular agriculture;the government orientates the four roles precisely in building the technology system of circular agriculture,to ensure that they do not cross the line,but be indispensable all the while.展开更多
文摘This article expounds the economic characteristics of circular agricultural technology.Since the circular agricultural technology has characteristics and externality of public goods,the government participation is necessary in building the technology system of circular agriculture,in order to avoid "free rider" behavior in the consumption of public goods and internalize externality.We analyze the orientation of government's role in building the technology system of circular agriculture:the government is the leader,designer,organizer and regulator in building the technology system of circular agriculture;the government orientates the four roles precisely in building the technology system of circular agriculture,to ensure that they do not cross the line,but be indispensable all the while.
