Produção Nacional
Preconcentration and chromatographic detection of atrazine in real water sample using aqueous two‐phase system based on tetrahydrofuran and glycerol
2021; Wiley; Volume: 31; Issue: 1 Linguagem: Inglês
10.1002/tqem.21738
ISSN1520-6483
AutoresFilipe Smith Buarque, Nayara Silva Lima, Cleide Mara Faria Soares, Maria Nogueira Marques, Eliane Bezerra Cavalcanti, Matheus M. Pereira, Ranyere Lucena de Souza, Álvaro Silva Lima,
Tópico(s)Analytical chemistry methods development
ResumoAbstract Environmental contamination by atrazine leads to serious environmental impact. The low concentrations of atrazine in aqueous media render its identification and quantification difficult. In this context, aqueous two‐phase systems based on tetrahydrofuran (THF) + glycerol were tested as simultaneous recovery and preconcentration platforms of atrazine from real water samples. The phase diagrams were determined, and it was reported that the phase separation ability largely depends on the number of hydroxyl groups present in each polyol. Posteriorly, the atrazine was partitioned to the THF‐rich phase and presented recovery values between 70.9 ( K ATZ = 2.9) and 96.5% ( K ATZ = 15.2). The computational predictive method (COSMO‐RS) was used, aiming to confirm the atrazine partitioning for the THF‐rich phase. In addition, a 250‐fold preconcentration factor was achieved using a mixture point of 3.27 wt% of THF + 93.98 wt% of glycerol + 2.75 wt% of real water sample. This preconcentration factor and subsequent use of UFLC‐TOF permitted the identification and quantification of atrazine in real samples of water collected in the hydrographic basin from the Japaratuba River, in the state of Sergipe, Brazil. The protocol presented values of 95‒2400 ng L −1 of atrazine with a limit of detection of 50 ng L −1 .
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