研究目的
To develop a low-cost, highly sensitive method for detecting furfural in transformer oil using pH-sensitive fluorescent organic nanoparticles.
研究成果
The poly(DOPA)-FONPs-based fluorescent method provides a rapid, sensitive, and cost-effective approach for furfural detection in transformer oil without complex sample preparation, demonstrating good precision and recovery in real samples, and holds promise for monitoring transformer health.
研究不足
The method may be interfered with by other carbonyl compounds, as hydroxylamine hydrochloride reacts with aldehydes and ketones, potentially reducing selectivity in complex samples. Optimization is needed for broader applicability to other analytes.
1：Experimental Design and Method Selection:
The study involves synthesizing poly(DOPA)-FONPs via ultrasonic polymerization of L-DOPA in alkaline ethanol, utilizing their H+-dependent fluorescence properties for furfural detection through an off-on mechanism involving reaction with hydroxylamine hydrochloride.
2：Sample Selection and Data Sources:
Real transformer oil samples were collected from serviced electrical equipment and filtered to remove impurities.
3：List of Experimental Equipment and Materials:
Instruments include a Hitachi F-4600 fluorescence spectrometer, JEM 2010 TEM, and TU-1901 UV-vis spectrophotometer. Materials include L-DOPA, LiOH, hydroxylamine hydrochloride, furfural, DMSO, and various solvents and metal ions.
4：Experimental Procedures and Operational Workflow:
Poly(DOPA)-FONPs were synthesized by ultrasonication, centrifuged, and dispersed in DMSO. For detection, hydroxylamine hydrochloride, furfural, and FONPs were mixed in DMSO, reacted for 1 min, and fluorescence spectra measured at 350 nm excitation.
5：Data Analysis Methods:
Fluorescence intensity changes at 520 nm were analyzed linearly with furfural concentration, with LOD calculated based on signal-to-noise ratio, and reproducibility assessed via RSD.
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