In this study, laser-induced breakdown spectroscopy (LIBS) was applied to detect some samples of tea, which were picked in three different seasons: spring, summer, and autumn. The relationship between some elements in the tea and the characteristics of its origin was analyzed. By comparing the relative intensity of the characteristic spectral lines of some elements in the tea samples harvested in different seasons, it was found that the content of some elements varies with the seasons. Besides this, the Pb in tea was quantitatively analyzed by the internal standard method. Then, the detection limit of Pb in the tea samples by LIBS in the experiment was calculated to be about 48.4 mg kg −1 . Moreover, the properties of plasma temperature and electron number density were studied and local thermal equilibrium state was verified. The carbon-nitrogen (CN) molecular bands were also clearly observed in the experiment and simulated. The vibrational temperature and rotational te...

中文翻译：

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基于激光诱导击穿光谱的不同季节采茶研究

在这项研究中，激光诱导击穿光谱法（LIBS）用于检测茶叶的一些样品，这些样品是在春季，夏季和秋季三个不同的季节采摘的。分析了茶中某些元素与其来源特征之间的关系。通过比较不同季节采茶样品中某些元素的特征谱线的相对强度，发现某些元素的含量随季节而变化。除此之外，采用内标法对茶叶中的铅进行了定量分析。然后，通过LIBS在实验中计算出的茶叶样品中的铅的检出限被计算为约48.4mg kg -1。此外，研究了等离子体温度和电子数密度的性质，并验证了局部热平衡状态。在实验中也清楚地观察到了碳氮（CN）分子带并进行了模拟。振动温度和旋转温度