Comparison of the performance of direct current atmospheric pressure glow microdischarges operated between a small sized flowing liquid cathode and miniature argon or helium flow microjets
Comparison of the performance of direct current atmospheric pressure glow microdischarges operated between a small sized flowing liquid cathode and miniature argon or helium flow microjets
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DOI：
10.1039/c3ja50062d
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发表时间：
2013-01-01
影响因子：
3.4
通讯作者：
Pohl, Pawel
中科院分区：
文献类型：
--
作者：
Greda, Krzysztof;Jamroz, Piotr;Pohl, Pawel
在微型Ar或He流动喷嘴微射流和小尺寸流动液体阴极之间维持低功率直流大气压辉光微放电，作为用于光学发射光谱的新的激发微源。两种微放电的发射光谱的形态进行了比较和两种气体的流量对它们的性能和所选金属（Ca，Cd，Cu，Fe，K，Li，Mg，Mn，Na和Zn）的分子谱带和原子线相关的发射特性的影响进行了研究，使用光学发射光谱。据建立，在微放电与微型He流微射流有更方便的条件，猝灭的频带发射来自OH，N2-，NH和NO分子相比，与Ar微射流。金属元素分析线附近的背景水平及其波动较低，但信噪比较高。在妥协的条件下，选定的数字的优点，更好的微放电与他微喷射进行了评价。钙，钾，锂，镁和钠的检测限评估范围为0.001至0.077毫克L-1。这些金属在六个自来水样品中进行了测定。该分析的准确度，表示为相对误差与火焰原子吸收光谱法（Ca，Mg）和火焰原子发射光谱法（K，Li，Na）测定的值，范围为-2.1%至+10.1%。此外，添加到分析的自来水样品中的金属的回收率从90.6%到106.9%不等。分析的精密度在0.2 - 4.6%范围内。
Low power direct current atmospheric glow microdischarges were sustained between miniature Ar or He flow nozzle microjets and a small-sized flowing liquid cathode as new excitation microsources for optical emission spectrometry. The morphology of emission spectra of both microdischarges was compared and the effect of the flow rate of both gases on their performance and the emission characteristic related to molecular bands and atomic lines of selected metals (Ca, Cd, Cu, Fe, K, Li, Mg, Mn, Na and Zn) were studied using optical emission spectrometry. It was established that in the microdischarge with the miniature He flow microjet there were more convenient conditions for the quenching of the band emission originating from OH, N-2, NH and NO molecules as compared to those with the Ar microjet. The background level and its fluctuation in the vicinity of analytical lines of metals were lower, while their signal to noise ratios were higher. Under compromised conditions, selected figures of merit for the better microdischarge with the He microjet were evaluated. The detection limits assessed for Ca, K, Li, Mg and Na were within the range of 0.001 to 0.077 mg L-1. These metals were determined in six samples of tap water. The accuracy of this analysis, expressed as the relative error with reference to values determined with flame atomic absorption spectrometry (Ca, Mg) and flame atomic emission spectrometry (K, Li, Na), ranged from -2.1 to +10.1%. In addition, recoveries of metals added to the analyzed tap water samples varied from 90.6 to 106.9%. The precision of the analysis was within 0.2-4.6%.