Análise da presença de espécies químicas a base de enxofre em corpos hídricos no estado do Ceará

Abstract

The state of Ceará has a long history of facing challenges associated with the supply of water resources, which are of great importance for the sustainable development of the region and the supply of the population. Therefore, it is essential to assess the quality of these waters, which sometimes end up receiving inadequate effluents discharges, some of them containing sulphur-based compounds in high concentrations, which prejudice the consumption of these waters and the environmental preservation of these ecosystems. This study examined the water quality of a stream and three reservoirs located in the north of Ceará and the Metropolitan Region of Fortaleza in relation to the parameters of sulfate, sulfide and sulfite, as well as assessing the possible impacts on health and the environment that could be caused by the high concentration of these species. The four samples collected in September 2023 had their values determined for the three parameters based on turbidimetric and iodometric techniques as described in APHA (2017) and NBR ABNT 5757 (2015). Also, it was investigated the influence of the presence of sodium, potassium, nitrite and sulfite itself as interferents. As a result, for all the samples, it was found that the parameters analyzed were within the limits set by this resolution, and that the interferents, at the concentrations found, did not indicate a significant influence on results. Therefore, there was no contamination in the samples of these water bodies by sulfate, sulfide or sulfite.