A combination of solid-phase extraction on hypercrosslinked polystyrene with HPLC determination of furan derivatives in transformer oils

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A chromatographic method for determining electric insulation degradation products in transformer oil (5-hydroxymethylfurfurol, furfurol, 2-acetylfurane, and 5-methylfurfurol) based on concentrating analytes by means of solid-phase extraction on hypercrosslinked polystyrene was developed. The main advantages of this method are high rapidity, reproducibility, and sensitivity. The detectability limit for each furan derivative was not above 30 μg/l, a characteristic that makes it possible to control the concentrations of analytes to an accuracy of 1% of their maximum permissible levels. The degrees of extraction for furfurol, 2-acetylfuran, and 5-methylfurfurol were above 95%, while that for hydroxymethylfurfurol ranged within 75–80%.