多电极复合法快速测定榨菜食盐含量

Rapid Determination of Salt Content in Pickled Mustard Tuber by Multiple Electrodes

建立一种基于多电极复合的榨菜食盐快速测试方法。首先设计制作由离子选择电极、温度传感器、参比电极、信号处理模块、单片机模块等组成的多电极复合系统硬件,然后建立钠离子、氯离子预测模型以及数据处理软件程序,最后使用该系统对3种涪陵榨菜进行食盐测定,并与传统测试法进行对比。结果表明,多电极复合法与传统法测定结果的平均相对误差小于5%,相对标准偏差小于2.0%,t检验结果无明显差异;单次测试时间小于20 s,该方法可作为榨菜食盐测定的快速方法。

This paper presents a rapid method for detecting the salt content in pickled mustard tuber based on multiple electrodes. Firstly, a hardware system consisting of ion selective electrodes, temperature sensor, reference electrode, signal processing module, single-chip module etc. was designed and fabricated; secondly, the predication models for sodium and chloride ions and data sampling and processing program software were established; finally, this system was used to measure salt contents in three kinds of Fuling pickled mustard tuber, and the results were compared with those obtained with the traditional testing method. The average error between the multiple electrode method and the traditional method was less than 5%, and their relative standard deviations were less than 2.0%. Additionally, there were no significant differences between the two methods as verified by t-test. The time required for a single test was less than 20 seconds. Thus, the multiple electrode method can be used as a quick way to determinate salt content in pickled mustard tuber.