UV法测定紫草中羟基萘醌总色素含量的不确定度评定及应用

对采用紫外-可见分光光度(UV)法测定紫草中羟基萘醌总色素含量全过程进行分析,建立数学模型,确定影响总色素测定不确定度的因素并对其进行评估。结果表明,总色素含量测定的扩展不确定度为0.06%,测定结果表示为(1.69±0.06)%(k=2),能力验证结果为满意。

基于ICP-MS法的狗脊重金属含量测定

采用电感耦合等离子体质谱(ICP-MS)法测定狗脊中重金属元素的含量。狗脊样品经过微波消解后,以锗、铟、铋为内标,测试了铜(Cu)、铅(Pb)、砷(As)、镉(Cd)、汞(Hg)5种重金属元素含量。研究结果表明,样品中均检测到了Pb、As、Cd、Hg和Cu 5种重金属元素,且元素测试线性关系良好(r≥0.9992),RSD范围为2.2%~5.4%。药材中5种重金属元素含量均在国家药典标准要求范围内。建议增加药典中狗脊重金属元素含量的检查项,完善其质量控制方法。

Phase Transformation Originated From Diffusion Induced Grain Boundary Migration

Superlattice phase transformation, occurred in the solute enriched region caused by diffusion induced grainboundary migration (DIGM), was found in two kinds of diffusion couples which consist of: (1) low carbon highstrength steel with hot dipped zinc coating, and (2) commercial pure iron with galvanized zinc coating after isothermally diffusion annealed at different temperatures (500, 560 and 580℃) with various durations. The product of thetransformation is an ordered phase with Li2 superlattice structure which was identified through the analysis by SEM,TEM and AEM. The ordered phase resulted from transformation occurred in the alloyed areas generated by DIGMand DIR The zinc content in this phase is variable, it approaches the stoichiometric composition Fe3Zn as the diffusion time is sufficiently prolonged. The mechanism of the transformation in connection with the process of DIGMand DIR was discussed. DIGM DIR and DIP (diffusion induced phase transformation) are three interrelatedprocessed originated from grain boundary diffusion.