Journal
ANALYTICAL SCIENCES
Volume 37, Issue 12, Pages 1825-1828Publisher
SPRINGERNATURE
DOI: 10.2116/analsci.21N023
Keywords
Liquid core waveguide; long-path absorption spectrophotometry; sulfide determination; gas diffusion flow injection
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Funding
- TSRI
- Center of Excellence in Materials Science and Technology, Chiang Mai University
- International Foundation for Science (IFS) [W-5094-1]
- Center of Excellence for Innovation in Chemistry (PERCH-CIC)
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A cost-effective long-path absorption liquid core waveguide (LCW) device, fabricated from a typical Teflon tube and using high refractive index (RI) medium of acid, was successfully applied in a flow injection-gas diffusion system for sensitive determination of sulfide via methylene blue (MB) chemistry. The device achieved a detection limit of 0.13 μmol L-1 without preconcentration, and showed good recovery rates of 88.7 - 103% in canal water samples.
A cost-effective long-path absorption liquid core waveguide (LCW) device was fabricated from a typical Teflon tube, and using a high refractive index (RI) medium of acid. It was incorporated in a flow injection-gas diffusion system for the sensitive determination of sulfide via methylene blue (MB) chemistry. The gas diffusion unit could prevent some interferences in samples. The limit of detection of 0.13 mu mol L-1 was achieved without using a preconcentration procedure. The proposed device was successfully applied for sulfide determination in canal water samples with 88.7 - 103% recovery.
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