Liu Shanshan

同位素内标-UPLC-MS/MS法测定烟草中的9种常见农药残留

为快速测定烟草中的农药残留，建立了烟草中9种常见农药残留的同位素内标-UPLC-MS/MS检测方法。以农药的氘代物为内标，样品经乙腈提取后，以N-丙基乙二胺（PSA）分散固相萃取净化，以BEH C18色谱柱进行分离，通过多反应离子监测模式（MRM）进行定性和定量分析。结果表明：① 各农药在12.5~500 ng/mL范围内呈良好的线性关系，相关系数>0.998。② 各农药残留的检出限（LOD）为0.003~0.009 mg/kg，定量限（LOQ）为0.011~0.030 mg/kg；空白样品在0.25~1.00 μg/g范围内3个加标水平的平均回收率为85.5%~110.1%，相对标准偏差 < 6.0%。③ 对30个实际样品测定发现，与空白基质匹配标准校正法相比，同位素内标法的结果一致，但操作简便。该方法适用于烤烟、白肋烟和香料烟等烟草及烟草制品中9种农药残留的检测。

Centralized Automatic Meter Reading System Based on GPRS Technology

With the continuous reform and innovation of science and technology, as well as the implementation of the comprehensive construction of smart grid strategic objectives, so that the development of the power industry has been a qualitative leap. Under the support of GPRS technology of mobile communication company in our country, the electricity meter reading system breaks the disadvantages of the traditional manual meter reading method, which saves a lot of labor cost and improves the quality and efficiency of the power meter reading, the centralized meter reading system has a series of advantages, such as high speed, high degree of automation and high accuracy, the electric power enterprise fully realized the importance of the centralized meter reading system under the GPRS technology. This paper will further analyze and discuss the centralized meter reading system based on GPRS technology.