绿麦隆农药纯度标准物质的定值及不确定度评定  

The Certification and Uncertainty Evaluation of Chlortoluron Reference Material Certified for Purity

作　　者：徐鹏[1,2] 范洁[2] 鲁炳闻[2] 杨刚[2] 张庆合[3] 刘菲[1] 

机构地区：[1]中国地质大学水资源与环境工程北京市重点实验室,北京100083 [2]环境保护部标准样品研究所,北京100029 [3]中国计量科学研究院,北京100013

出　　处：《农药》2013年第9期660-663,共4页Agrochemicals

摘　　要：[目的]以市售绿麦隆农药为原料,经纯化和混匀后,研制绿麦隆农药纯度标准物质。[方法]采用气相色谱-飞行时间质谱法(GC-TOF-MS)对绿麦隆进行结构鉴定。采用质量平衡法(MB)和差式扫描量热法(DSC)对绿麦隆进行纯度定值,并分别评价2种定值方法的不确定度。[结果]研制的绿麦隆农药纯度标准物质均匀性良好,稳定时间至少20个月,纯度保证值为99.7%,扩展不确定度为0.3%(k=2)。[结论]为环境中绿麦隆的分析检测提供量值溯源保证。[Aims] Chlortoluron was prepared and certified as pure reference material by repeated recrystallization and mixing. [Methods] The structure of the material was qualitatively identified by GC-TOF-MS. The purity of chlortoluron was determined by mass balance method and differential scanning calorimetry. The uncertainty of two methods were respectively evaluated. [Results] Chlortoluron had better homogeneity and its stability could maintain at least 20 months, the purity value of chlortoluron was 99.7%, the expanded uncertainly was 0.3%（k=-2）. [Conclusions] Provide traceability assurance for the detection and analysis of chlortoluron in environment.

关 键 词：绿麦隆 标准物质 纯度 气相色谱-飞行时间质谱法 质量平衡法 差式扫描量热法 不确定度评定 

分 类 号：TQ450.7[化学工程—农药化工]