ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

The electrical conductivity method for determination of acid value in edible oil was developed based on the electrical conductivity change value of alkaline solution during reaction, and the effects on determination of the varying condition, as concentration of the alkaline solution, types of the oil samples, temperature and the solid-liquid ratio were explored. The method was validated by Chinese national standard methods. The results showed the experimental conditions had no significant effect on the determination. When the solid-liquid ratio was 1∶10, the calibration was y=0.0024x-0.1571 (where x is the value of the conductivity change, y is acid values), R2=0.9984. The linear correlativity of the determination of the acid value between two methods was very well, the relative deviation of blind samples experiment’s data were less than 10%.