The effects of furoic acid and furfuryl alcohol on the detection of furfural in transformer oil were studied using the traditional liquid–liquid extraction combined with high-performance liquid chromatography (LLE-HPLC) technology, in which, the methanol used as extraction agent and the C18 column and ultraviolet−visible detector were used as the separation and detection units for the determination of the furfural. The results show that the presence of furfuryl alcohol or furoic acid increases the extraction efficiency of furfural from 42.07 to 73.21% and 65.33%, respectively. The extraction efficiency of furfural decreases when the concentrations of furfuryl alcohol increase from 0.2 to 0.6 mg L−1, but the extraction efficiency of furfural increases with the concentrations of furoic acid from 0.2 to 0.6 mg L−1. This indicated that the accuracy of detection and extraction efficiency of furfural in transformer oil by LLE-HPLC technology may be affected by the furfuryl alcohol or furoic acid dissolved in transformer oil.

中文翻译：

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糠酸和糠醇对高效液相色谱法检测变压器油中糠醛的影响

采用传统的液-液萃取结合高效液相色谱(LLE-HPLC)技术，以甲醇为萃取剂，以甲醇为萃取剂，研究了糠酸和糠醇对变压器油中糠醛检测的影响。 C18柱和紫外-可见检测器被用作测定糠醛的分离和检测单元。结果表明，糠醇或糠酸的存在使糠醛的提取效率分别从42.07%提高到73.21%和65.33%。当糠醇浓度从0.2增加到0.6 mg L-1时，糠醛的提取效率降低，但随着糠酸浓度从0.2增加到0.6 mg L-1，糠醛的提取效率增加。