Determination of Aluminum Potassium Sulfate Content in Vermicelli Using an Excitation Equipotential Method
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Abstract:
Herein, an excitation equipotential method was established to determine the content of aluminum potassium sulfate in vermicelli. Sinusoidal AC signals with an excitation voltage of 5~20 V at 300~700 Hz were applied to a primary coil to analyze the electrical characteristics of aluminum potassium sulfate solution in a secondary coil (or sample coil). The impact of excitation voltages on ground voltages was greater than that of frequencies with the same mass fraction of aluminum potassium sulfate solutions. Increasing mass fractions of aluminum potassium sulfate solutions enhanced potential differences with increasing frequency and excitation voltage. On altering the excitation voltage from 5 V to 20 V, the potential difference of 20 mg/kg aluminum potassium sulfate solution increased by 78.79%. Parameters in the excitation equipotential method were linearly correlated, presenting a correlation coefficient (r) of 0.94. Four kinds of commercial vermicelli products were examined at 300 Hz and 20 V, and the relative standard deviations of detection results were within 1.50%. The excitation equipotential method exhibited repeatability. It also showed better accuracy than the chemical method, with relative errors for detection results within 2.00%. This excitation equipotential method helps analyze pretreated solutions of vermicelli at the secondary coil, determining its electrical characteristics to quantify the aluminum potassium sulfate content. This study provides a novel method for detecting aluminum potassium sulfate content in food.
