分析样品处理中的红外线快速加热技术

本文研究了红外线快速加热样品处理工艺,红外线由钨灯产生,酸性悬浊液样品盛在玻璃容器中.该工艺的主要优点是结构简单、费用低.另外,稀酸溶液不到60s中就可加热到需要温度,且整个过程不到5min.该工艺适用于痕量分析,最初的研究是测定牛肝、苹果叶等原料中的Cu、Fe、Mn含量.结果可以达到95%的置信水平.在未经任何预处理或仅做冷冻干燥情况下,可测定铜和锰的含量,证实与用常规的微波辅助法结果一致.

Infra- red Heating Technique for Fast Sample Preparation

A procedure for sample preparation was investigated in this work using infra-red radiation generated by tungsten lamps for fast heating of an acidic sample suspension contained in a glass flask. The main advantages of the developed procedure are its simplicity and low-cost. Additionally the dilute acid solution is heated in less than 60 s and the total sample preparation is performed in less than 5 min. The proposed procedure is suitable for trace analysis and it can be easily implemented. The preliminary investigations focus on the determination of Cu, Fe, Mn, and Zn in bovine liver and apple leaves as standard reference materials. All results are in agreement at 95% confidence level. Copper and Mn were also determined in a sample of bovine liver without any sample pretreatment or after a freeze-drying step for comparison. For this sample, the results were validated using a conventional microwave-assisted closed vessel procedure.