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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Portable and Disposable Paper-Based Fluorescent Sensor for In Situ Gaseous Hydrogen Sulfide Determination in Near Real-Time

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da Silveira Petruci, Joao Flavio ; Cardoso, Arnaldo Alves
Total Authors: 2
Document type: Journal article
Source: Analytical Chemistry; v. 88, n. 23, p. 11714-11719, DEC 6 2016.
Web of Science Citations: 13

Hydrogen sulfide is found in many environments including sewage systems, petroleum extraction platforms, kraft paper mills, and exhaled breath, but its determination at ppb levels remains a challenge within the analytical chemistry field. Off-line methods for analysis of gaseous reduced sulfur compounds can suffer from a variety of biases associated with high reactivity, sorptive losses, and atmospheric oxidative reactions. Here, we present a portable, I online, and disposable gas sensor platform for the in situ determination of gaseous hydrogen sulfide, employing a 470 run light emitting diode (LED) and a microfiber optic USB spectrometer. A sensing layer was created by impregnating 2.5 mu L (0.285 nmol) of fluorescein mercury acetate (FMA) onto the surface of a micropaper analytical device with dimensions of 5 x 5 nun, which was then positioned in the optical detection system. The quantitative determination of H2S was based on the quenching of fluorescence intensity after direct selective reaction between the gas and FMA. This approach enabled linear calibration within the range 17-67 ppb of H2S, with a limit of detection of 3 ppb. The response time of the sensor was within 60 s, and the repeatability was 6.5% (RSD). The sensor was employed to monitor H2S released from a mini-scale wastewater treatment tank in a research laboratory. The appropriate integration of optoelectronic and mechanical devices, including LED, photodiode, pumps, and electronic boards, can be used to produce simple, fully automated portable sensors for the in situ determination of H2S in a variety of environments. (AU)

FAPESP's process: 15/23265-5 - Miniaturized equipment based on change of optical property and management by free hardware for determination of trace gases in the atmosphere
Grantee:Arnaldo Alves Cardoso
Support type: Regular Research Grants
FAPESP's process: 13/22995-4 - Luminescent sensor for in situ determination of reduced sulfur compounds in gaseous matrices using palladium compounds
Grantee:João Flávio da Silveira Petruci
Support type: Scholarships in Brazil - Post-Doctorate