期刊
ACS SENSORS
卷 7, 期 8, 页码 2209-2217出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.2c00611
关键词
amperometry; wine; sulfur dioxide reduction; electrochemical oxygen filter; screen-printed electrodes
Accurate and rapid on-site analysis of free SO2 content is crucial in winemaking. Researchers have developed an amperometric sensor based on commercially available screen-printed electrodes and an electrochemical oxygen filter. The sensor showed similar precision and accuracy compared to the standard method, with the advantage of no interference from oxidizable species.
Accurate and rapid on-site analysis of free SO2 content is crucial in the process of winemaking from a producer and consumer perspective. Herein, we present an amperometric sensor based on commercially available screen-printed electrodes coupled with an electrochemical oxygen filter. The developed amperometric method gave a linear response in a concentration range up to 200 mg L-1 with a limit of quantification of 7.5 mg L-1. The applicability of the developed sensor was successfully tested on 27 white and red wine samples and compared to the Ripper method (iodometry) that is a standard procedure for free SO2 determination. The sensor exhibits similar precision and accuracy but shows no interference from oxidizable species such as ascorbic acid, which is a major advantage over iodometric titration. The performance of the sensor was in addition positively evaluated during on-site analysis in a winery.
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