Voltammetry and amperometry are inexpensive and high-performance analytical techniques. However, their lack of selectivity limits their use in complex matrices such as biological, environmental, and food samples. Therefore, voltammetric and amperometric analyses of these samples usually require time-consuming and laborious sample pretreatments. In this study, we present a simple and cost-effective approach to fabricate a miniaturized electrochemical cell that can be easily coupled to a head space-like gas extraction procedure in such a way the sample pretreatment and voltammetric detection are performed in a single step. As a proof of concept, we have used the proposed system to quantify sulfite in beverage samples after its conversion to SO_2(g). Despite the simplicity and low cost of the proposed system, it provided good analytical performance and a limit of detection of 4.0 μmol L⁻¹ was achieved after only 10 min of extraction. The proposed system is quite versatile since it can be applied to quantify any volatile electroactive species. Also, the proposed system provides a unique way to assess real-time extraction curves, which are essential to study and optimize new gas extraction procedures. Therefore, the approach described in this study could contribute to both applied and fundamental Analytical Chemistry.

伏安法和电流法是廉价且高性能的分析技术。然而，它们缺乏选择性限制了它们在复杂基质中的应用，例如生物、环境和食品样品。因此，对这些样品进行伏安和电流分析通常需要耗时费力的样品预处理。在这项研究中，我们提出了一种简单且具有成本效益的方法来制造小型化电化学电池，该电池可以轻松地与类似顶部空间的气体提取程序相结合，从而使样品预处理和伏安检测在一个步骤中进行。作为概念证明，我们使用建议的系统在饮料样品转化为 SO _2(g)后对其进行量化. 尽管所提出的系统简单且成本低，但它提供了良好的分析性能，并且在仅提取 10 分钟后就达到了 4.0 μmol L ^-1的检测限。所提出的系统非常通用，因为它可以用于量化任何挥发性电活性物质。此外，所提出的系统提供了一种独特的方法来评估实时提取曲线，这对于研究和优化新的气体提取程序至关重要。因此，本研究中描述的方法有助于应用和基础分析化学。