铯添加剂对电感耦合等离子体光源辐射的增强效应

Strengthening effect of cesium additive on the light radiation of inductively coupled plasma

为了改善电感耦合等离子体原子发射光谱质量,降低分析检出限,实验研究了在水样品中加入的铯添加剂对光谱强度、信背比的影响,并通过多谱线斜率法和Stark展宽法分别测量了等离子体的激发温度和电子密度。实验结果表明,当水溶液样品中加入铯添加剂以后,等离子体光谱强度有了不同程度的增强。在铯含量为1.0g/L时,重金属元素As、Cd、Hg和Ni的谱线强度比无添加剂时分别提高了31.13%、21.57%、28.15%和36.31%,光谱信背比分别提高了31.60%、22.22%、27.68%和36.00%。在样品中铯含量为1.0g/L的条件下,等离子体的激发温度比无添加剂时提高了130.71K,而电子密度提高了3.78×1012/cm3。可见,铯添加剂能够提高电感耦合等离子体发射光谱质量。

In order to improve the inductively coupled plasma atomic emission spectrometry quality and reduce the analytical detection limit, the effect of cesium additive in water sample on spectral intensity and signal-to-background ratio was studied. The excitation temperature and electron density of plasma were measured by multispectral slope method and Stark widening method, respectively. The experi- mental results showed that, after adding cesium additive in water sample, the spectral intensities of heavy metal elements including As, Cd, Hg and Ni were enhanced to varying degrees. When the con-tent of cesium was 1.0 g/L, the 21.57 %, 28.15 %0 and 36.31% %, 27.68 % and 36.00 %, respe spec , an tral intensities of As, Cd, d the signal-to-background ctively. When the content of ces Hg and Ni increased by 31.13 %, ratio increased by 31.60 G, 22.22 ium in sample was 1.0 g/L, the ex-citation temperature of pl tron density increased by tively coupled plasma ato asma increased by 130.71 K than that without cesium additive, and the elec- 3.78 × 10^12/cm3. Therefore, the cesium additive could enhance the induc- mic emission spectrum quality.