Atomic emission spectrometry in liquid electrode plasma using an hourglass microchannel

Kohara, Yoshinobu; Terui, Yasushi; Ichikawa, Megumi; Yamamoto, Kazuko; Shirasaki, Toshihiro; Kohda, Kimiyoshi; Yamamoto, Tamotsu; Takamura, Yuzuru

doi:10.1039/c5ja00059a

Cited by 20 publications

(13 citation statements)

References 27 publications

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“…In order to fairly compare the detection performance to our precious works using radial view LEP, a high-resolution Andor spectrometer was applied to evaluate the analytical performance of axial view LEP in this work. It should be noted that it was the same system including the power supply, optical fiber, and the spectrometer that applied for previous radial view LEP devices. , With the optimal conditions, the separated solution containing Zn, Cd, or Pb with different concentrations were used to make the calibration curve. Thereafter, the limit of detection (LOD) of each element can be determined by using the equation LOD = 3.3 σ/ m , where σ is the standard deviation of the blank solution and m is the slope of the calibration curve.…”

Section: Experimental Sectionmentioning

confidence: 99%

“…In liquid electrode glow discharge (i.e., ELCAD, SCGD, SAGD, ...) and an LEP system, the emission spectra were usually taken from the radial direction of plasma. However, spatial distribution of the emissions from different elements was observed along the plasma. − Literature studies have tried to identify the strongest emission position for different elements and used such position for analysis to improve the detection performance. , Another solution to achieve better sensitivity was the observation along the axial direction of plasma (axial view), which was a common approach used in ICP-OES. , The use of axial view in miniaturized plasma devices was also reported by Peng and Wang and the group of Yang . In their studies, the chemical vapor of analytes was generated through the hydride generation (HG) technique and an axial view APGD-OES device was incorporated as the excitation source. , …”

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confidence: 99%

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Fabrication and Characterizations of Axial View Liquid Electrode Plasma Atomic Emission Spectrometry for the Sensitive Determination of Trace Zinc, Cadmium, and Lead

et al. 2022

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Axial view liquid electrode plasma-atomic emission spectrometry (axial view LEP-AES) was proposed and fabricated successfully in this work. The emission spectra from Zn, Cd, Pb, Ca, and K were applied for characterization and optimization. Comparing with conventional radial view LEP-AES devices, the newly designed axial view-LEP provided better sensing ability toward trace heavy metals. Moreover, pulsed voltage discharge was found to be advantageous over continuous discharge under the same discharge time for detection. The optimized parameters facilitate the limit of detection to achieve 0.24, 0.051, and 0.85 μg L −1 for Zn, Cd, and Pb, respectively. Furthermore, the axial view LEP-AES possessed excellent reproducibility and good durability. The real sample tests using two different certified reference water samples revealed the great potential of the axial view LEP-AES as a novel practical elemental analysis tool.

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Section: Experimental Sectionmentioning

confidence: 99%

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Fabrication and Characterizations of Axial View Liquid Electrode Plasma Atomic Emission Spectrometry for the Sensitive Determination of Trace Zinc, Cadmium, and Lead

et al. 2022

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“…An alternative approach to avoiding sample introduction altogether is to generate the plasma inside the sample itself, as is the case with the liquid electrode microplasma (LEP). Kohara et al 60 followed up on their previous work by using an hourglass capillary in which to generate the microplasma. The capillary was made of silica, was only 50 mm wide at the narrowest part and the plasma was generated by applying a pulsed DC voltage across two Pt electrodes, at the capillary ends.…”

Section: Instrumentationmentioning

confidence: 99%

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Evans

Pisonero

Smith

et al. 2016

J. Anal. At. Spectrom.

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SUMMARY OF CONTENTS This review covers developments in 'Atomic Spectrometry'. It covers atomic emission, absorption, fluorescence and mass spectrometry, but excludes material on speciation and coupled techniques which is included in a separate review. It should be read in conjunctionwith the other related reviews in the series. [1][2][3][4][5][6] Sample introductionThis section covers developments in sample introduction for all instrumental methods. LiquidsLiquid sample introduction relates to methods wherein the sample is introduced into the instrument in the form of a liquid, such as through nebulization or into a thermal vaporizer; whereas in vapour generation the sample is initially in the form of a liquid but is converted to a vapour prior to introduction into the instrument. Sample pre-treatment.A general review of on-line preconcentration for ICP-MS has been published by Das et al. 7 , covering solid phase methods and including 63 references. Several reviews of sample pretreatment methods used for atomic spectrometry are worth noting because they focus on specific areas: Kocurova et al. 8and Jain and Verma 9 have reviewed advances in DLLME (53 references) and SDME (407 references) respectively; Zhao et al. the same authors studied the stability of the labelled complexes at different pH and temperature, and when subject to separation using LC. They reported a significant decrease in stability when LC separation was used, and some degradation at 37 °C compared to 2 °C.Li et al. An immunoassay-linked method using gold nano-particles has been developed by Jarujamrus et al. 33 . In this approach the monoclonal antibody-chloramphenicol was attached to a solid support. Antigen-chloramphenicol was labelled with gold nano-particles (10 nm) at pH 9.5, attached to a bovine serum albumin protein and mixed with unlabelled antigenchloramphenicol, which was then added to the antibody-chloramphenicol. for U and Th respectively in water samples.

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“…Recently, plasma processes in liquids have been gaining a lot of attention owing to their wide range of possible applications, such as nanoparticle and nanocarbon production, water cleaning, plasma medicine, and plant growth promotion [1][2][3][4][5][6][7][8][9]. One promising application is the use of optical emission spectroscopy (OES) of various plasmas generated in liquid or in contact with liquid for elemental composition analysis of the liquid [10][11][12][13][14]. There are many methods for the generation of plasmas directly in liquids with low conductivity; however, reproducible generation of plasma directly in highly-conductive liquids is still challenging [5,[14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Preheating Phase of Micro-Arc Discharge in Seawater, Operated Using a Needle-to-Plane Electrode with Variation in the Tip Shape

Gamaleev

Hiramatsu

Ito

et al. 2019

Plasma

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In this work, micro-arc discharge is investigated using a needle-to-plane electrode system placed with a micro-gap in highly conductive artificial seawater. A major problem with microarc discharge is the erosion of electrodes caused by the high current of the arc; however, it was found that erosion of the needle electrode did not have any effect on the discharge process in the case of precise control of the discharge gap. A simple mathematical model was developed for a more detailed study of the preheating phase of the discharge. The modeling showed good agreement with the experimental results and confirmed that the needle electrode could be reused to generate reproducible micro-arc discharges even after the erosion caused by the arc. Moreover, it was found that, in certain conditions, the preheating phase could be simulated using a simple inductor-capacitor-resistor (LCR) oscillator model with a resistor instead of electrodes immersed in the liquid. It was confirmed that the shape of the needle electrode’s tip did not affect the measurement of optical emission spectra in the case of precise focusing, which could be used in the development of compact analytical tools for on-site analysis of deep-sea water using atomic emission spectroscopy.

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Atomic emission spectrometry in liquid electrode plasma using an hourglass microchannel

Abstract: Liquid electrode plasma atomic emission spectrometry (LEP-AES) is a new elemental analysis method that uses microplasma. LEP forms in a vapor bubble generated inside a narrow-center microchannel by using high-voltage DC pulse power.

Cited by 20 publications

References 27 publications

Fabrication and Characterizations of Axial View Liquid Electrode Plasma Atomic Emission Spectrometry for the Sensitive Determination of Trace Zinc, Cadmium, and Lead

Fabrication and Characterizations of Axial View Liquid Electrode Plasma Atomic Emission Spectrometry for the Sensitive Determination of Trace Zinc, Cadmium, and Lead

Atomic spectrometry update: review of advances in atomic spectrometry and related techniques

Analysis of the Preheating Phase of Micro-Arc Discharge in Seawater, Operated Using a Needle-to-Plane Electrode with Variation in the Tip Shape

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