摘要
基于压电传感器对介质的介电特性有灵敏的频率变化响应,建立快速测定煎炸油极性组分的压电传感法。获取煎炸油的频率响应曲线,采用Boltzmann对响应曲线进行拟合,并提取可用于测定煎炸油的压电频率特征值,结合国标柱层析法建立校正集煎炸油极性组分含量与压电频率特征值之间的标定方程:Y=9 008 070-66X,r=0.993;根据标定方程,结合国标法规定的煎炸油合格标准判别阈值27%,获得压电传感法判别阈值为9 006 281 Hz。采用压电传感法对验证集和随机挑选的油样品的极性组分含量进行检测,同时采用国标法进行对照测定。结果表明,所提出的压电传感法与国标法在测定的准确性和精密度上没有显著差异,压电传感法具有快速、简便的优势,该法有望运用于油品监督的现场检测中。
A piezoelectric sensing method was proposed for rapid detection of polar component content in frying oils.The method was based on the sensitive frequency response to the dielectric changes between the electrodes. The typical frequency shift responsive curves were obtained and fitted by Boltzmann equation from which the characteristic frequency values were extracted. The calibration equation of polar component content was obtained combined with the national standard column chromatography method as follows: Y = 9 008 070-66 X,r = 0.993. According to the calibration equation, the threshold value 9 006 281 Hz was obtained to evaluate the quality of frying oils combined with the national standard column chromatography method. The polar component content of random frying oil samples were detected quickly using the piezoelectric sensing method. For comparison, the national standard method was carried out at the same time. The results showed that there are no significant differences in measuring precision between two methods. The proposed method is rapid and convenient. It is expected to on-site inspection for supervision department.
引文
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