Chen Ze-yong, Peng Rong-fei, Zhang Zhan-xia
School of Chemistry, Zhongshan University, Guangzhou 510275, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2002 Jun;22(3):453-7.
An atomic emission spectrometer based on acousto-optic tunable filter (AOTF) was self-constructed and was used to evaluate its practical use in atomic emission analysis. The AOTF used was of model TEAF5-0.36-0.52-S (Brimrose, USA) and the frequency of the direct digital RF synthesizer ranges from 100 MHz to 200 MHz. ICP and PMT were used as light source and detector respectively. The software, written in Visual C++ and running on the Windows 98 platform, is of an utility program system having two data banks and multiwindows. The wavelength calibration was performed with 14 emission lines of Ca, Y, Li, Eu, Sr and Ba using a tenth-order polynomial for line fitting method. The absolute error of the peak position was less than 0.1 nm, and the peak deviation was only 0.04 nm as the PMT varied from 337.5 V to 412.5 V. The scanning emission spectra and the calibration curves of Ba, Y, Eu, Sc and Sr are presented. Their average correlation coefficient was 0.9991 and their detection limits were in the range of 0.051 to 0.97 micrograms.mL-1 respectively. The detection limit can be improved under optimized operating conditions. However, the spectral resolution is only 2.1 nm at the wavelength of 488 nm. Evidently, this poor spectral resolution would restrict the application of AOTF in atomic emission spectral analysis, unless an enhancing techniques is integrated in it.
自行搭建了一台基于声光可调谐滤波器（AOTF）的原子发射光谱仪，并对其在原子发射分析中的实际应用进行了评估。所使用的AOTF型号为TEAF5 - 0.36 - 0.52 - S（美国Brimrose公司），直接数字射频合成器的频率范围为100 MHz至200 MHz。分别采用电感耦合等离子体（ICP）和光电倍增管（PMT）作为光源和探测器。该软件用Visual C++编写，运行在Windows 98平台上，是一个具有两个数据库和多个窗口的实用程序系统。采用十次多项式线性拟合方法，利用Ca、Y、Li、Eu、Sr和Ba的14条发射线进行波长校准。峰位的绝对误差小于0.1 nm，当PMT从337.5 V变化到412.5 V时，峰偏差仅为0.04 nm。给出了Ba、Y、Eu、Sc和Sr的扫描发射光谱和校准曲线。它们的平均相关系数为0.9991，检测限分别在0.051至0.97微克·mL⁻¹范围内。在优化的操作条件下，检测限可以提高。然而，在488 nm波长处，光谱分辨率仅为2.1 nm。显然，这种较差的光谱分辨率会限制AOTF在原子发射光谱分析中的应用，除非集成增强技术。
