Validação e aplicação de um método analítico para detecção de agrotóxicos no leite produzido em Salvador das Missões/RS

Abstract

Milk is a food that appears in diets of all ages and that is why contamination control is very important to guarantee its quality. The following work aims to optimize, validate and apply a QuEChERS and LC-MS method for the determination of residues of seven pesticides in nine samples from dairy farms in the city of Salvador das Missões in the northwest of the state of Rio Grande do Sul. Since dairy farming and agriculture are the pillars of the municipality's economy, this unprecedented work was very important to determine the quality of the milk produced in the city. First, the optimization of the method was carried out using C18 in the cleaning and low temperature cleaning phase. As there was no difference between the processes. The cleaning method with C18 was chosen in order to minimize the process steps. In the validation of the method, accuracy was obtained in terms of recovery from 70 to 118% and intermediate precision in terms of relative standard deviation (RSD) lower than 20%. The result of the samples showed that in relation to the monitored compounds, there was no contamination. This may indicate how careful farmers are with contamination. However, the need for work continuity is highlighted, increasing the number of samples and expanding the scope of monitored products