Pesticides are chemical compounds used in agriculture to combat or prevent unwanted pest infestations. Its importance has generated many discussions nowadays due to the fact that the latest scientific research has been pointing out that these can cause diseases such as cancer. One of the most used classes of pesticides are carbamates, which may highlight aldicarb, which is popularly known as “chumbinho”. Its marketing has been banned in Brazil since 2012, however, it is used as a rodenticide and in criminal practices such as homicides and suicides. Therefore, the development of reliable, simple and low-cost analytical methods for monitoring this type of substance is of fundamental importance. Electroanalytical techniques use electrical properties of chemical species that can be measured. Within this branch, we can highlight voltammetric techniques, a set of electroanalytical techniques that measure the electric current of electron transfer processes between a chemical species and the surface of an electrode. In these instrumental techniques, a working electrode, an auxiliary and a reference electrode are used. Working electrodes can be modified in order to improve their sensitivity and / or selectivity in the detection of certain chemical species. In this work, the gold electrode was modified to produce a gold nanoporous film, which made it possible to detect the aldicarb pesticide. This modification occurs through the oxidation of gold in a strongly acidic medium at high potentials and subsequent reduction. The nanoporous film produced has a high surface area, allowing better electron transport when compared to gold electrodes without this modification. Figure 1 shows the comparison of the cyclic voltammetric response of the aldicarb on gold bare and gold modified electrodes. In view of the versatility, low cost and excellent sensitivity of voltammetric techniques, an analytical method was developed using differential pulse voltammetry to quantify aldicarb. At first, experimental variables were studied to optimize the method, such as pH, support electrolyte, gold electrode modification time and analyte pre-concentration time. After optimizing these parameters, an analytical curve was constructed with a concentration range between 0.20 to 2.64 μmol L–1 (R2 = 0.9806), and a detection limit of 18 nmol L–1 and standard deviation relative less than 1%. Therefore, the proposed method has excellent sensitivity and reproducibility, which makes it promising to be used in routine laboratories and in the field.