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| 电导率双频测量法鉴别地沟油 |
| Discerning of swill-cooked dirty oil by conductivity dual frequency measurement |
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| DOI： |
| 中文关键词: 双频测量 电导率 地沟油 极化效应 电容效应 |
| 英文关键词:dual frequency measurement conductivity swill-cooked dirty oil polarization effect capacitance effect |
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| 中文摘要: |
| 应用电导率双频测量法消除了常规电导率测量法在地沟油鉴别过程中电导池的极化效应与电容效应。用不同质量浓度NaCl溶液样品在0～100 mg/L范围对测量系统线性度进行测量，获得的线性拟合相关系数R2为0.996 7，显示测量系统在测量范围内具有良好的线性相关性。通过在电导池中加载750 Hz与1 500 Hz两个具有倍频关系的正弦信号，在25℃恒温下采用单盲测试法对菜籽毛油、精炼菜籽油、一级大豆油、地沟油及按不同体积分数制备的掺假油样品进行了测量。结果表明：电导率双频测量法测量结果的相对不确定度为0.36%～0.60%，与常规电导率测量法相比，测量精度更高，测量方法更可靠。 |
| 英文摘要: |
| The polarization and capacitance effects in the discerning of swill-cooked dirty oil by common conductivity measurement were eliminated by conductivity dual frequency measurement. The linearity of the measurement system was measured by NaCl solution with different mass concentrations ranging from 0 to 100 mg/L，and the linear correlation coefficient obtained was 0.996 7，exhibiting an excellent linearity of the measurement system within the measurement range. By loading two sinusoidal signals 750 Hz and 1 500 Hz in conductivity cell，which had frequency doubling，the measurements of swill-cooked dirty oil，crude rapeseed oil，refined rapeseed oil，first grade soybean oil and adulterated oils were carried out at 25℃ using single-blind test method. The results showed that the relative uncertainty of the measurement results of conductivity dual frequency measurement was 0.36%-0.60%，and the measurement precision was higher and determination method was more reliable compared with common conductivity measurement. |
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