Detecção e quantificação de multiresíduos de agrotóxicos por HPLC-MS em águas subterrâneas utilizadas para consumo humano na zona rural de municípios da Região das Missões/RS

Abstract

The presence of pesticides in water sources is the second main form of water contamination in the country, therefore, monitoring of the quality of drinking water should be performed to identify the presence of these compounds in the wastewater to the population. Therefore, the objective of the work was to determine and quantify pesticide residues in groundwater wells used for public supply, through the analytical technique in High Performance Liquid Chromatography coupled with Mass Spectrometry (HPLC-MS), in thirteen municipalities of Região das Missões/RS. The methodology consisted of collect a sample of groundwater in each municipality in the 4 seasons of the year and remained as a selection criterion the well pick-up that meets the largest population in rural areas. In these wells the water quality was evaluated according to the parameters absorbance UV λ-254 nm, microbiological analysis (presence/absence of total coliforms and Escherichia coli), electric conductivity (μS cm-1), apparent color (uH), fluoride (mg L-1), nitrate (mg L-1), dissolved oxygen (mg L-1), pH, sedimentable solids (mL L-1), temperature (°C) and turbidity (uT) and also for the presence of 24 active pesticide ingredients, 2,4-D, atrazine, azoxystrobin, bentazone, carbofuran, cyproconazole, clomazone, diphenoconazole, epoxyconazole, fipronil, imazapique, imazetapyr, malationa, metsulfuron-methyl, penoxsulam, piraclostrobin, pyrazosulfuron, pirimicarb, profenophos, propiconazole, simazine, tebuconazole, thiamethoxam and trifloxystrobin.