Trends and advances in portable analytical instrumentation

Overton, Edward B.; Dharmasena, H.P.; Ehrmann, Ursula; Carney, Kenneth R.

doi:10.1002/(sici)1520-6521(1996)1:2<87::aid-fact4>3.0.co;2-b

Cited by 50 publications

(24 citation statements)

References 6 publications

(7 reference statements)

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“…The videos were imported into MATLAB environment and its gray color intensity was extracted during the time period of 36 s (161 frames). The gray color intensity (I gray ) is based on the RGB (red-green-blue) response for each frame according to equation (2) where R is the reflectance at some path, k is the particle-size-dependent absorption coefficient, and s is the scattering coefficient.…”

Section: Computational Analysismentioning

confidence: 99%

“…1 These instruments are useful and advantageous, especially due to the low cost, simplicity of operation, convenience of fast in situ analysis and appropriate sensitivity and specificity to produce near realtime information used to solve specific problems which require rapid feedback of information. 2 Examples of portable instruments based on ion trap mass, 3 Raman, 4 near infrared 5 and mid-infrared 6 spectroscopies, capillary electrophoresis [7][8][9][10][11] and X-ray fluorescence 12 represent the tendency of instrument miniaturization for sensing applications. In case of miniature ion trap mass spectrometry, which represents a high breakthrough in portable analytical instrumentation, two approaches can be used to build this kind of instrument: the bottom-up approach in which the miniature instrument is assembled with the components built on a specific scale of interest; and the top-down approach, in which the component sizes of a macroscale instrument are reduced in an interactive way to maintain their performance.…”

Section: Introductionmentioning

confidence: 99%

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A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

Morais

Silva

Pinheiro

et al. 2017

J. Braz. Chem. Soc.

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This paper presents a low-cost reflectometer for selective detection of Cu 2+ . The reflectometer is based on an emission light source using five light-emitting diodes at different wavelengths and a detector using a webcam. The samples were prepared using a filter paper-based colorimetric sensor with ascorbic acid-based quinoxaline derivative. Video analysis using gray color intensity was used to perform both copper ion screening ( ) and quantification of Cu 2+ in spiked samples. In addition, a multivariate validation was performed. The system proved to be selective to Cu 2+ among the screened ions, and its quantification was performed using partial least square regressions. Good linearity (R 2 = 0.979, coefficient of determination), low root-mean-square error of prediction (RMSEP = 5.20 × 10 -3 mol L -1 ) and high recovery (93.39-128.64%) were achieved. This method has potential to be employed for rapid and selective determination of Cu 2+ in water using low-cost instrumentation.

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Section: Computational Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

Morais

Silva

Pinheiro

et al. 2017

J. Braz. Chem. Soc.

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“…Numerous types of more complex field-portable instruments (e.g., optical and mass spectrometers [16][17][18], X-ray fluorescence devices [12,19], and chromatography-based instruments [20,21]) have also been developed, and, in some cases, commercialized. Portable analyzers have used separation or flow-analysis methods (e.g., flow-injection analysis [22,23], and gas chromatography (GC) [24][25][26] and liquid chromatography (LC) [27][28][29][30]).…”

Section: Portable Instrumentationmentioning

confidence: 99%

Portable capillary-based (non-chip) capillary electrophoresis

Ryvolová

Preisler

Brabazon

et al. 2010

TrAC Trends in Analytical Chemistry

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Miniaturized, portable instrumentation has been gaining popularity in all areas of analytical chemistry. Capillary electrophoresis (CE), due to its main strengths of high separation efficiency, relatively short analysis time and low consumption of chemicals, is a particularly suitable technique for use in portable analytical instrumentation. In line with the general trend in miniaturization in chemistry utilizing microfluidic chips, the main thrust of portable CE (P-CE) systems development is towards chip-based miniaturized CE. Despite this, capillary-based (non-chip) P-CE systems have certain unmatched advantages, especially in the relative simplicity of the regular cylindrical geometry of the CE capillary, maximal volume-to-surface ratio, no need to design and to fabricate a chip, the low costs of capillary compared to chip, and better performance with some detection techniques. This review presents an overview of the state of the art of P-CE and literature relevant to future developments. We pay particular attention to the development and the potential of miniaturization of functional parts for P-CE. These include components related to sample introduction, separation and detection, which are the key elements in P-CE design. The future of P-CE may be in relatively simple, rugged designs (e.g., using a short piece of capillary fixed to a chip-sized platform on which injection and detection parts can be mounted). Electrochemical detection is well suited for miniaturization, so is probably the most suitable detection technique for P-CE, but optical detection is gaining interest, especially due to miniaturized light sources (e.g., light-emitting diodes).

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“…These drawbacks have hindered miniaturization of GC instruments for which a wide range of applications is foreseen [1]. Recent developments in the micro-fabrication of GC systems using micromachining technology have demonstrated the potential for reductions in size, power consumption, and analysis time compared to conventional GC systems [2][3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Carbon Nanotube Stationary Phase in a Microfabricated Column for High-Performance Gas Chromatography

Nakai¹,

Okawa²,

Takada³

et al. 2009

AIP Conference Proceedings

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Abstract. We report a microfabricated gas chromatography (GC) column that uses a thin layer of high-quality singlewalled carbon nanotubes (SWNTs) as a stationary phase. This 1.0-m-long, 160-μm-wide, 250-μm-deep column has the highest separation efficiency reported to date for microfabricated columns having an SWNT stationary phase. Separation efficiency was evaluated with a Golay plot, in which the minimum of the height equivalent to a theoretical plate was 0.062 cm. The microfabricated column was able to separate n-alkanes having high boiling points under temperatureprogrammed conditions. Use of SWNTs as a stationary phase will be potentially useful for high-performance micro-GC.

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Trends and advances in portable analytical instrumentation

Cited by 50 publications

References 6 publications

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

A Low-Cost Video-Based Reflectometer for Selective Detection of Cu2+ Using Paper-Based Colorimetric Sensors

Portable capillary-based (non-chip) capillary electrophoresis

Carbon Nanotube Stationary Phase in a Microfabricated Column for High-Performance Gas Chromatography

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