影响电导法测定面粉中灰分的因素分析

利用面粉抽提液中可溶性离子的电导率测定面粉的灰分是一种快速测定方法，本文研究了面粉溶液的导电率和其灰分的关系，研究了抽提时间、温度、抽提条件及底物对其溶液导电的影响。结果表明：电导法测定面粉中灰分的影响因素首要影响因素为抽提温度；抽提时间在一定范围内的延长有利于电导率的测定，在1h左右达到稳定；抽提方法中离心后静置15min测定其上清液最佳，过滤对测定结果影响不大。

The Effective Factors for Flour Ash Determination by Conductivity

Soluble mineral conductivity of flour extraction aqueous systems in an index to measure ash of flour.The effects of extraction time, temperature,and solvent on the conduction of suspensions were studied. The results show that the first effective factor is extraction temperature.A proper extraction time extension benefits the conductivity measure. 15 min after extraction is the best point for the conductivity measure.Filtering does not affect measure result. The solvent should be double vapor water.