Stability study of standards used for calibration of the spectrophotometer wavelength scale

Debossan, L F; Carvalho, Eduarda Martins; Souza, M A; Gomes, Jefferson de Oliveira

doi:10.1088/1742-6596/733/1/012026

Cited by 1 publication

(1 citation statement)

References 3 publications

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“…Thus, they require accurate and reliable calibrations. For example, liquid standards are used for the calibration of spectrophotometers [ 24 , 25 ] and High Performance Liquid Chromatography (HPLC) devices. Standard gases are mainly used for the calibration of sensors [ 26 , 27 , 28 ], gas chromatographs [ 29 , 30 ] and other fluorescence detectors [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Validation of a Novel Generator of Gas Mixtures Based on Axial Gas Pulses Coupled to a Micromixer

Noël

Trocquet²,

Serra

et al. 2021

Micromachines

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In this work, a novel generator of gas mixtures previously numerically investigated and based on axial gas pulses coupled to a micromixer has been conceived, manufactured, and validated. Standard gaseous pollutant mixtures and pure nitrogen or pure air were introduced in a microdevice designed to generate alternating axial gas pulses which were downstream homogenized by means of a multi-stage modular micromixer. The dilution, and therefore the final pollutant concentration, was controlled by two parameters: the ratio between the times of each of the two gas pulses and the partial pressure of the pollutant(s) mixture added to the device. The gas mixture generator was coupled to an analyzer to monitor the concentration of aromatic pollutants. The response time was optimized to be lower than 2 min in accordance with the analytical instrument. The quantity of pollutants measured at the micromixer’s outlet increased linearly with the expected gas concentration of 3.7–100 ppb generated by this novel microfluidic generator and fitted perfectly with those obtained by a reference gas dilution bench. At 5 ppb, the precision on the concentration generated is close to that obtained with the conventional gas mixing bench, i.e., around 10%.

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