3D printing has a significant impact on various applications as it facilitates greater control over the designed shapes, leads to rapid prototyping and mass production with transferable designs at a lower cost. These attributes provide great versatility and thus make the devices industry-friendly. Herein, we demonstrate a simple and disposable 3D printed device, fabricated in single-step, as an electrochemical nitrite sensor using commercially available carbon loaded polylactic acid (PLA) filament. Nitrite, usually ingested through water and food, can be harmful when taken in excess. Thus, its efficient and accurate on-site detection becomes imperative. The device showed appreciable sensitivity and good selectivity towards nitrite having a limit-of-detection (LOD) of $1.96~\mu \text{M}$ . Furthermore, the device has been shown to monitor nitrite in real soil and water samples with appreciable recovery values. Eventually, the device is capable to be multiplexed with varying soil parameters.

中文翻译：

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3D 打印小型化设备中的高灵敏度和无干扰电化学亚硝酸盐检测

3D 打印对各种应用产生了重大影响，因为它有助于更​​好地控制设计的形状，以更低的成本实现快速原型制作和批量生产，并具有可转移的设计。这些属性提供了极大的多功能性，从而使设备对行业友好。在此，我们展示了一种简单且一次性的 3D 打印设备，它是一种使用市售碳载聚乳酸 (PLA) 灯丝的电化学亚硝酸盐传感器，它是一步制造的。亚硝酸盐通常通过水和食物摄入，过量摄入可能有害。因此，其高效准确的现场检测变得势在必行。该装置对亚硝酸盐显示出可观的灵敏度和良好的选择性，其检测限 (LOD) 为 $1.96~\mu \text{M}$ . 此外，该设备已被证明可以监测真实土壤和水样中的亚硝酸盐，并具有可观的回收率值。最终，该设备能够与不同的土壤参数进行多路复用。