Research Article
Determination of Pyrethroids in Tea Brew by GC-MS Combined with SPME with Multiwalled Carbon Nanotube Coated Fiber
Figure 4
The effect of the stirring rate on the extraction efficiency (). The standard mixture concentration: 20 ng mL−1, extraction time: 20 min, desorption temperature: 280°C, and desorption time: 5 min.