钾添加剂对ICP光源辐射的增强效应

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钾添加剂以后对光谱强度、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钾添加剂以后,等离子体光谱强度有不同程度的增强。在钾含量为1.0g.L-1时,元素Al,Cr,Cu,Mn,Ni和Zn的谱线强度比无添加剂时分别提高了8.62%,32.29%,108.45%,6.06%,64.98%和54.99%,光谱信背比分别提高了7.90%,30.95%,104.60%,5.21%,66.00%和52.82%。在样品中钾含量为1.0g.L-1的条件下,等离子体的激发温度比无添加剂时提高了239.69K,而电子密度提高了4.99×1011 cm-3。可见,钾添加剂能够提高电感耦合等离子体发射光谱质量。

The enhancement effect of potassium additives on ICP source radiation

In order to improve the quality of inductively coupled plasma-atomic emission spectrum and reduce the detection limit of analysis, the influence of potassium additives into water samples on water samples' spectral intensity and signal-to-background ratio was studied. The excitation temperature and electron density of plasma were measured through multi-line slope and the Stark broadening method. The results demonstrated that the plasma spectral intensity intensity increases to a various degree after adding potassium additives into the sample solution. When the content of the potassium is 1.0 g x L(-1), the spectral lines intensity of element Al, Cr, Cu, Mn, Ni and Zn was increased by 8.62%, 32.29%, 108.45%, 6.06%, 64.98% and 54.99% respectively, the spectral signal-background ratio increased by about 7.90%, 30.95%, 104.60%, 5.21%, 66.00% and 52.82%, respectively. Under the conditions of the content of potassium is 1.0 g x L(-1) in the sample, the plasma excitation temperature increased by about 239.69 K than that without additive, and the electron density increased by about 4.99 x 10(11) cm(-3). It is thus clear that potassium additives can improve the quality of inductively coupled plasma-atomic emission spectrum.