The Microwave Plasma Torch (MPT) is an excellent excitation source for on-line monitoring of environmental samples. However, the feasibility of particle detection and plasma diagnosis through particle introduction has not been reported yet. In this paper, Eu₂O₃/Ag and SiO₂ suspensions were prepared, characterized and then introduced sequentially into the laboratory-made oxygen shielding argon flow MPT (OS-Ar-MPT) plasma for OES measurements with a time resolution of 6 ms. Signal spikes of Eu, Ag and Si lines from individual particles were observed, respectively, which demonstrates the feasibility of MPT-OES for particle detection. By using the line intensities from signal spikes and the measured sizes, the detection limits of the current instrument for Si, Ag and Eu in individual particles are estimated to be 1.8, 0.15 and 0.19 pg, respectively. The Eu(I) and Eu(II) line intensities extracted from the signal spikes were used to calculate the excitation temperature (T_exc) of the OS-Ar-MPT plasma through the Boltzmann slope method. As a comparison study, the T_exc was also calculated by using the traditional Fe(I) line Boltzmann slope method through solution introduction. The results show that T_exc,Eu-I = 3293 K, T_exc,Eu-II = 3414 K, and T_exc,Fe-I = 4883 K. Meanwhile, the OH (0,0) band spectrum was simulated by varying the rotational temperature (T_rot) by LIFBASE, and then compared with the measured spectrum when the Fe solution was nebulized. The best value of T_rot lies between 3100 and 3400 K. Through this work, the capability of Ar-MPT-OES for particle detection is confirmed. Besides, the range of elements suitable for plasma diagnosis is widened and more diagnostic data of MPT plasma temperature are obtained.

中文翻译：

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通过悬浮液引入Ar-MPT-OES进行等离子体温度粒子检测和光谱诊断的可行性研究

微波等离子炬（MPT）是用于在线监测环境样品的出色激发源。然而，尚未报道通过粒子引入进行粒子检测和等离子体诊断的可行性。本文中，Eu ₂ O ₃ / Ag和SiO ₂制备，表征悬浮液，然后将其依次引入实验室制造的氧气屏蔽氩气流MPT（OS-Ar-MPT）等离子体中，用于OES测量，时间分辨率为6 ms。分别观察到来自单个颗粒的Eu，Ag和Si线的信号尖峰，这证明了MPT-OES用于颗粒检测的可行性。通过使用来自信号尖峰的线强度和测得的尺寸，当前仪器中单个颗粒中Si，Ag和Eu的检出限估计分别为1.8、0.15和0.19 pg。从信号尖峰提取的Eu（I）和Eu（II）线强度用于计算激发温度（T _exc玻尔兹曼斜率法测定OS-Ar-MPT等离子体）。作为比较研究，还通过使用溶液引入通过使用传统的Fe（I）线Boltzmann斜率方法来计算T _exc。结果表明，T _exc，Eu-I = 3293 K，T _exc，Eu-II = 3414 K，T _exc，Fe-I = 4883K。同时，通过变化来模拟OH（0,0）谱带用LIFBASE旋转温度（T _rot），然后与雾化Fe溶液时的实测光谱进行比较。T _rot的最佳价值介于3100和3400 K之间。通过这项工作，证实了Ar-MPT-OES用于粒子检测的能力。此外，扩大了适用于血浆诊断的元素范围，并获得了更多的MPT血浆温度诊断数据。