差示扫描量热法和毛细管法对农药熔点测定的对比  

Comparison of Differential Scanning Calorimetry and Capillary Method for Determining Melting Point of Pesticides

作　　者：范娅 冯文英 张博 张继伟 牛洺鑫 王鹏思 张宇铸 FAN Ya;FENG Wenying;ZHANG Bo;ZHANG Jiwei;NIU Mingxin;WANG Pengsi;ZHANG Yuzhu(Central Research Institute of China Chemical Science and Technology,Beijing100083,China)

机构地区：[1]中化化工科学技术研究总院有限公司,北京100083

出　　处：《现代农药》2021年第6期26-28,共3页MODERN AGROCHEMICALS

摘　　要：本研究选取啶虫脒、稻瘟灵等6种常见的农药标准品作为研究对象,用差示扫描量热法和毛细管法对其熔点进行分析对比。试验表明,毛细管法重复性好,升温速率对其影响不大;使用差示扫描量热法重复性一般,随着升温速率加快,熔程发生明显延迟。在GLP试验中,基于检测成本,便利性等,对于较稳定、有敏锐熔点的农药样品,低熔点建议优先采用毛细管法,高熔点采用差示扫描量热法;对于熔融过程中现象不明显、熔融时分解的农药样品,可以采用2种方法综合分析。The purpose of this work was to compare differential scanning calorimetry(DSC)and capillary method for determining melting points of 6 kinds of common pesticide reference material including acetamiprid and isoprothiolane,etc.The results showed that the capillary method had good repeatability,and the heating rate had little effect on it.The repeatability of DSC method was general,and the melting points were significantly delayed with the heating rate increased.Considering detection cost and convenience in the GLP test,for the samples with stable and sensitive melting points,capillary method could be applied to detect low melting points of pesticides,and DSC method could be used to the high melting points of pesticides.Two methods could be combined to analyze the pesticides whose process of melting had no obvious phenomenon or decomposition.

关 键 词：差示扫描量热法 毛细管法 熔点 农药标准品 

分 类 号：TQ450.6[化学工程—农药化工] TQ450.7