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Combination of online hollow fiber liquid phase microextraction with smartphone-based sensing for in situ formaldehyde assay in fabric and wastewater samples

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Abstract

A miniaturized analytical methodology was introduced based on the combination of a direct and online hollow fiber microextraction method with smartphone color detection. The method was used for the determination of formaldehyde (target analyte) in fabric and wastewater samples. In this regard, two reagents including ammonium acetate buffer and acetylacetone were added to the formaldehyde samples to create a colored compound. The colored compound was extracted from the sample by using the hollow fiber liquid-phase microextraction method, the extracted phase was not taken out of the extraction box and was directly transferred into a specially designed detection cell, and a smartphone was applied for in-situ color sensing and data readout. This combination gathered the advantages of both state-of-the-art microextraction techniques and smartphone sensing. Formaldehyde, as a carcinogenic compound widely used in paint and clothing industries, was selected as a model test. Factors affecting extraction efficiency were investigated and optimized, including the type of organic solvents, reagent concentration, salt, pH, stirring speed, reaction temperature, and extraction time. The linear region of the method under optimal conditions was 40–1500 µg L−1 for wastewater samples and 0.3–11.2 mg kg−1 for fabrics. The limit of detection and limit of qualification were 13 and 40 µg L−1, respectively. The relative standard deviations for concentrations of 100 and 1000 µg L−1 were 6% and 4%, respectively. To evaluate the application of the method for real samples, types of fabric and two samples of oil refinery wastewater were selected. The relative recovery in real samples was 84–98%. The results of the analytical parameters of the method show that the developed method can be used as an efficient method to determine formaldehyde in real samples.

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Acknowledgements

This work was supported by the research council of the Isfahan University of Technology (IUT).

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Authors and Affiliations

  1. Department of Chemistry, Isfahan University of Technology, Isfahan, 84156–83111, Iran

    Salman Javadian, Mohammad Saraji & Ali Shahvar

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  1. Salman Javadian
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  2. Mohammad Saraji
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  3. Ali Shahvar
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Contributions

Salman Javadian: conceptualization, investigation, methodology, formal analysis. Mohammad Saraji: supervision, writing—review and editing. Ali Shahvar: conceptualization, writing—original draft, validation.

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Correspondence to Mohammad Saraji.

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Javadian, S., Saraji, M. & Shahvar, A. Combination of online hollow fiber liquid phase microextraction with smartphone-based sensing for in situ formaldehyde assay in fabric and wastewater samples. Microchim Acta 191, 329 (2024). https://doi.org/10.1007/s00604-024-06406-0

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