3D electrochemical device obtained by additive manufacturing for sequential determination of paraquat and carbendazim in food samples

[Display omitted] •Lab-made conductive filaments for 3D printing of electrochemical sensors.•First 3D printed sensor is proposed for pesticide detection.•Sequential analysis was applied for paraquat and carbendazim in real samples.•Fast, inexpensive and eco-friendly analysis was performed for pesticides detection. Pesticides are heavily employed compounds protecting crops, however, these compounds can be extremely harmful to human health. Once the monitoring of pesticides in foods is of great importance, in this work we propose a ready-to-use electrochemical sensor made with 3D printing technology, capable of detecting paraquat and carbendazim in sequential analysis. The proposed electrodes are lab-made and of easy obtention, composed of graphite on a polylactic acid matrix, and provided great results for the analysis of paraquat and carbendazim in honey, milk, juice, and water samples. The sequential analysis of paraquat and carbendazim was proposed, providing optimal analysis of both compounds individually when both are present in a mixture. Limits of detection of 0.01 and 0.03 µmol/L for paraquat and carbendazim, respectively. Recovery tests attested to the suitability of the method, ranging from 94.5 to 113.7 %, and the suitability of 3D printing for environmental and food samples analysis.