The present study aimed to investigate the occurrence of non-steroidal antiinflammatory drugs - NSAIDs in the Bolonha Complex, Belém-Pa, from water samples
collected in the Bolonha Reservoir (raw water) and after the filtration and disinfection
of the ETA Bolonha, in addition to verifying possible relationships between the
NSAIDs in the study and the water quality parameters. The determination of NSAIDs
was based on the solid phase extraction method, on GC-MS (Gas Chromatography
coupled to mass spectrometry) for the identification of the compounds Ibuprofen (IBU)
and Paracetamol (PAR), and LCMS/MS (Chromatography Liquid coupled to sequential
mass spectrometry) to obtain Naproxen (NAP) and Diclofenac (DFC). The results
obtained indicated the presence of the four drugs PAR, IBU, NAP and DFC in the
Bolonha Complex. At point AB, the first three drugs, respectively, had an annual mean
of 3.7 ng/L, 9.1 ng/L and 351.8 ng/L. At point AF, the same drugs obtained, in the same
order, annual mean concentrations of 14 ng/L, 231.2 ng/L and 1932.2 ng/L. At point
AT, only IBU and DFC were detected, with annual averages of 0.9 and 35.9 ng/L,
respectively. It was found that the main step responsible for the elimination of drugs
was chlorination, especially in the rainy season, equivalent to an annual removal
efficiency of 100% in the cases of PAR and NAP, and 94%, referring to the IBU. In the
correlations, no strong relationship was identified between the drugs detected in the raw
(AB), filtered (AF) and treated (AT) water points. At Point AB, the approximation of
the NAP with the pH color, apparent color, total iron, turbidity and E-coli variables
stands out. At point AF, the same drug showed a correlation with the apparent color in
the rainy season, however in the dry season it did not show strong correlations with any
of the variables analyzed. At point AT, the DFC stood out with the approximation of the
pH, turbidity and alkalinity variables. In general, the assessment of the presence of
NSAIDs proved to be important for a better understanding of the issue of
microcontaminants in the Amazon and, in addition, confirmed the hypothesis of the
presence of NSAIDs in different parts of the ETA Bolonha, which may be related to the
discharge of untreated sewage from the neighboring population
|
