电磁感应加热技术在水体重金属快速石墨富集中的应用

针对激光诱导击穿光谱技术用于水体重金属连续、自动、快速、高灵敏监测中的需求，以石墨为富集基体，采用电磁感应加热技术实现了样品的快速加热与富集，并研究了基于降温斜率的烘干判断方法。实验中以设定140℃判定定时2 s为例，测得从室温上升到140℃用时30 s，温度的误差范围为-5~+3℃，基于降温斜率准确判断了富集完成状态。研究结果表明，采用电磁感应加热技术结合基于降温斜率的富集完成判断方法可以有效实现被测样品的快速加热和准确烘干判断。

Application of Electromagnetic Induction Heating Technology in Rapid Drying of Graphite Enrichment of Heavy Metal in Water

For continuous automatic, fast and high sensitive analysis of heavy metal in water by laser-induced breakdown spectroscopy technique (LIBS), the sample solution was enriched onto graphite sheet and heated by electromagnetic induction heating technology. Finally, the rapid heating and enrichment of the sample was achieved. In addition, the dry judgment method based on the cooling slope wereinvestigated . In the example of a set temperature 140℃ and timing 2 s, the rise time was measured as 30 s from room temperature to 140℃ and the temperature error range was -5 ~ +3℃. The completion status of enrichment was also accurately determined on the basis of the cooling slope. The results show that the rapid heating and accurate drying judgment can be effectively achieved by the use of electromagnetic induction heating technology combined with the judgment method of enrichment completion based on the cooling slope .