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Determination of Minor Alloyed Elements in Steel Samples in Radio-frequency Glow Discharge Plasma Optical Emission Spectrometry Associated with Pulsed Bias-Current Modulation Technique

机译:脉冲偏置电流调制技术在射频辉光放电等离子体发射光谱中测定钢样中的微量合金元素

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An advanced detection method based on a modulation technique is described in radio-frequency-powered glow discharge plasma optical emission spectrometry (r.f. GD-OES). A frequency-sensitive separation using a fast Fourier transform (FFT) analyser, where a pulsated bias-current was introduced into an r.f. GD plasma, was available for improving the limit of determination for the atomic emission analysis. The FFT analyser has an ability to disperse signal components by frequency, and it is thus employed to select the component of a particular frequency. A dc bias current introduced into the GD plasma can enhance the emission intensities of analyte species greatly, and furthermore, it can be easily pulsated to modulate the emission intensities from the plasma. The modulated emission signal was selectively detected with the FFT analyser, with removing any noise components from the overall signal. The duty ratio of the pulsed bias current largely affected the amplitude of the FFT frequency components, because the pulse waveform comprised sine-function components having frequencies integral-times as much as the fundamental frequency, whose contribution coefficients depended on the duty ratio. This detection method was applied to the determination of vanadium and molybdenum in low-alloyed steel samples. The detection limits were obtained to be 6.2 × 10~(-3) mass% V and 2.0 × 10~(-3) mass% Mo in low-alloyed steel samples.
机译:在射频辉光放电等离子体发射光谱仪(r.f. GD-OES)中描述了一种基于调制技术的高级检测方法。使用快速傅里叶变换(FFT)分析器进行频率敏感的分离,其中将脉动偏置电流引入到r.f. GD等离子体可用于改善原子发射分析的测定极限。 FFT分析仪具有按频率分散信号成分的能力,因此可用于选择特定频率的成分。引入GD等离子体中的直流偏置电流可以大大提高分析物种类的发射强度,此外,可以很容易地对其进行脉动以调制等离子体的发射强度。用FFT分析仪有选择地检测调制后的发射信号,同时从整个信号中去除任何噪声成分。脉冲偏置电流的占空比在很大程度上影响FFT频率分量的幅度,因为脉冲波形包含正弦函数分量,其频率是基频的整数倍,其贡献系数取决于占空比。该检测方法用于测定低合金钢样品中的钒和钼。在低合金钢样品中的检出限为6.2×10〜(-3)质量%V和2.0×10〜(-3)质量%Mo。

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