We studied the matrix effects arising in the presence of elements with ionization potentials of 5.13–9.39 eV (Na, Cu, Pb, Cd, Zn) in atmospheric nitrogen plasma excited by the H₀₁₁ wave in a cylindrical microwave resonator (2.45 GHz) for optical emission spectrometry “Grand-MP”. The influence of the concentration of matrix on the signal of several atomic and ionic emission lines (covering E_sum values from 3.82 to 15.40 eV) of 13 elements has been studied. Compared to the 2.0% w w⁻¹ nitric acid reference solution, the emission signal for atomic lines with E_sum values lower than 5 eV was enhanced in the presence of Na, Cu, Pb but it was suppressed for the remaining atomic and ionic lines tested. It is shown that, with a decrease in the ionization potential of the matrix element, matrix effects for both atomic and ionic lines increase. The atomic temperature of the plasma is 5.2 × 10³ K and does not change in the presence of up to 1% copper, cadmium, lead and zinc. The electron density is 1.9 × 10¹³ cm⁻³ and increases not only in the presence of Na, but also 1% Pb, Cu. The influence of the nebulizer gas flow rate and plasma power on the signal of atomic and ionic lines has been studied. It was shown that a decrease in atomizer gas flow to 0.4 L min⁻¹ and an increase in plasma power up to 1650 W can reduce the matrix effects.

中文翻译：

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常压氮气微波诱导等离子体发射光谱法中的基体效应

我们研究了在圆柱形微波谐振器（2.45 GHz）中由H ₀₁₁波激发的大气氮等离子体中，电离势为5.13–9.39 eV的元素（Na，Cu，Pb，Cd，Zn）存在时产生的基质效应。发射光谱法“ Grand-MP”。研究了基质浓度对13种元素的几条原子和离子发射谱线的信号（覆盖E_和值介于3.82至15.40 eV之间）的影响。与2.0％ww ^-1硝酸参考溶液相比，原子线的发射信号为E _sum在Na，Cu，Pb的存在下，低于5 eV的值得到增强，但对于其余测试的原子和离子谱线，其值被抑制。结果表明，随着基质元素电离电位的降低，原子和离子线的基质效应都增加。等离子体的原子温度为5.2×10 ³ K，在存在高达1％的铜，镉，铅和锌的情况下不会改变。电子密度为1.9×10 ¹³ cm ^-3，不仅在Na的存在下，而且在1％的Pb，Cu中也增加。研究了雾化器气体流速和等离子体功率对原子线和离子线信号的影响。结果表明，雾化器气流减少至0.4 L min ^-1 而将等离子体功率提高到1650 W可以减少基体效应。