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Rocha, Diego P.; Anjos, Gabriel T.C.; Neri, Thais S.; Tronto, Jairo; Pinto, Frederico G.; Silva, Sidnei G.; Coelho, Nívia M.M.
Talanta, 02/2018, Letnik: 178Journal Article
This work showed a flow system designed with solenoid valves for preconcentration of fluoride using SPADNS method in water samples. The analyte was preconcentrated in a mini-column coated with Layered Double Hydroxides (LDH) used as adsorbent. Then, the fluoride ions were eluted with 0.5 mol L−1 sodium hydroxide and determined by spectrophotometry. The variables that affect the system such adsorbent mass, type of eluent, solutions flow rate, reagent concentration and pH effect were critically evaluated. Under optimized conditions, the detection limit, coefficient of variation, linear range and preconcentration factor were estimated at 15 µg L−1 (99.7% confidence level), 0.8% (500 µg L−1, n = 10), 50–500 µg L−1 and 10, respectively. The accuracy of the method was evaluated by analysis of ALPHA APS 1076 (Simulated Rain Water) certified material, the values were not significantly different at a 95% level of confidence. The method was applied for fluoride determination in water samples and the levels found were below the maximum values established by Brazilian environmental and health legislations. Display omitted •Noteworthy flow system was designed for preconcentration of fluoride using SPADNS method.•LDH was used as solid phase extractor.•The potential to develop greener analytical procedures is shown in this work.•This method was applied to water samples with no pretreatments being required.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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