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.

中文翻译：

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用于葡萄酒中游离亚硫酸盐选择性现场分析的电流传感器

_{从生产者和消费者的角度来看，对游离 SO 2}含量进行准确快速的现场分析对于酿酒过程至关重要。在此，我们提出了一种基于市售丝网印刷电极和电化学氧气过滤器的安培传感器。开发的安培法在高达 200 mg L ^–1的浓度范围内给出线性响应，定量限为 7.5 mg L ^–1。_{开发的传感器的适用性已在 27 个白葡萄酒和红葡萄酒样品上成功测试，并与游离 SO 2}的标准程序 Ripper 方法（碘量法）进行了比较决心。该传感器具有相似的精密度和准确度，但不受抗坏血酸等可氧化物质的干扰，这是优于碘滴定法的主要优势。此外，在酿酒厂的现场分析期间，传感器的性能得到了积极评价。