Mr. Syed Murtaza Haider Profile

Syed Murtaza Haider

at Lahore Univ of Management Sciences

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Proceedings Article | 5 March 2021 Presentation + Paper

Fluoride detection in drinking water using evanescent fiber cavity ring down spectroscopy

Ubaid Ullah, Murtaza Haider Syed, Daniyal Ghauri, Falak Sher, M. Imran Cheema

Proceedings Volume 11635, 116350T (2021) https://doi.org/10.1117/12.2577575

KEYWORDS: Water, Spectroscopy, Sensors, Phase shifts, Absorption, Head, Fiber Bragg gratings, Chemistry, Biosensors

Read Abstract +

Contaminated drinking water is a global health issue, particularly for third-world countries. Fluoride is a widely found contaminant whose prolonged exposure in quantities greater than 1.5 mg/L causes various health hazards, including dental fluorosis and stiffness in the backbone or joints. State-of-the-art techniques for detecting fluoride in water include titrimetric, potentiometric, spectrophotometric, and chromatographic systems. Although these techniques provide fair accuracy, these systems face mass adaptability constraints due to their resource-intensive nature. This suggests a need to develop sensors that can provide rapid, portable, and accurate fluoride detection in drinking water. Here, we demonstrate a fluoride sensor by employing the principle of phase shift cavity ring down spectroscopy (PS-CRDS) in fiber cavities. In PS-CRDS, the magnitude of phase shift between output and input sinusoids is a measure of an absorption event within the cavity. We realize the sensor by building a cavity using fiber Bragg gratings. We insert a tapered fiber of < 10 μm waist within the cavity as a sensing head. We inject a 2 mL sample solution along with 2 mL of pre-stored SPADNS−zirconyl acid complex reagent for enhancing absorption at 633 nm into a customized fluidic cell. The cell holds the tapered portion of the cavity. We then quantify fluoride in the sample using PS-CRDS with the detection limit of less than 2 ppm. We anticipate that the current work with a modified chemistry protocol can be extended to a rapid and accurate biosensor for detecting a variety of diseases, including tuberculosis and pneumonia.

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