葡萄烈酒降度过程中电化学参数在线分析

On-line Analysis of Electrochemical Properties of Grape Spirit during Dilution

对体积分数85.0%乙醇即蒸葡萄烈酒进行降度处理,同时采用多参数分析仪对酒中pH值、溶解氧(DO)值、氧化还原电位(ORP)值和电导率变化情况进行在线检测。结果表明:在葡萄烈酒降度工序中,由于体系内分子间非离子化质子交换、氢键缔合结构的分离再重组以及非酒精挥发物质等影响,其电化学参数有如下变化:pH值先升高后下降,在5.10左右稳定;DO值变化趋势为逐渐升高,并在7.75mg/L时达到饱和;ORP值为先下降而后缓慢阶梯式上升,最终在106mV左右稳定;电导率缓慢上升至37.2μS/cm,有继续升高的趋势。

Grape spirit with a 85.0% alcohol content was diluted with soft water to 40.2%, various electrochemical properties including pH, dissolved oxygen （DO） value, oxidation reduction potential （ORP） value and conductivity were on-line measured using a multi-parameter analyzer in this study. It was demonstrated that during the dilution process, the pH value increased first, then declined, and finally reached a stable value of 5.10.The DO value increased gradually until saturation was reached.The ORP value decreased sharply at first and then increased step by step to a stable value. On the other hand, the conductivity gradually increased during the whole dilution process.