优化了超声提取茶叶中铜、镁、锰和锌4种矿质元素的条件(超声时间、温度、样品量、粒径和提取剂),方法的检出限为0.01 mg/L~0.06 mg/L,相对标准偏差(RSD)为2.3%~3.7%,回收率为97.3%~104%。比较了原子吸收光谱法测定茶叶中4种元素的微波和超声2种样品前处理方法。结果表明,2种方法测定结果均与标准值符合,微波法精密度好,适用元素较多,应用广泛;超声法简便快速,安全性好。 The optimal extraction conditions for ultrasonic extraction of copper, magnesium, manganese and zinc in tea by ultrasonication (ultrasonic time, temperature, sample size, particle size and extractant) were optimized. The detection limits were 0.01 mg / L ~ 0.06 mg / L The relative standard deviations (RSDs) ranged from 2.3% to 3.7% and the recoveries from 97.3% to 104%. The two kinds of sample pretreatment methods were compared by atomic absorption spectrometry to determine the four elements in tea. The results showed that the results of two methods were consistent with the standard values, the precision of the microwave method was good, the applicable elements were more and the applications were extensive; the ultrasonic method was simple, rapid and safe.