development of method based on dispersive liquid-liquid microextraction air-assisted for multi-element determination of cadmium and manganese in sugarcane spirit (brazilian cachaça) by faas

In this work, a new method was developed for multi-element determination of cd and mn in samples of sugarcane spirit (cachaça) by faas using the air-assisted dispersive liquid-liquid microextraction (aa-dllme). after univariate and multivariate optimizations (mixture design), the experimental conditions were as follows: 5.2 ml of sample at ph 8.5, 0.7 ml 10% (w/v) nacl solution, 120 μl of trichlorethylene (extraction solvent) containing 1-(2-pyridylazo)-2-naphthol (pan) at 0.05% (w/v) as chelating agent, six cycles of stirring the mixture with a glass syringe, and 3 min of centrifugation. in these conditions, the calibration curve obtained for cd was abs = 0.0158ccd + 0.0333, with r2 0.9951 and for mn was abs = 0.0011cmn + 0.0142 and r2 0.9911. the limits of detection, enrichment factor, and consumption index were, respectively, 0.51 μg l−1, 79 and 0.07 ml for cd, and 1.64 μg l−1, 18, and 0.28 ml for mn. precision was evaluated at concentrations of 5 and 10 μg l−1, and rsd% (n = 10) was 0.97% and 6.6% for cd and 2.8% and 4.5% for mn, respectively. addition and recovery tests in samples of brazilian cachaça were performed to evaluate the accuracy, and recoveries were 87% to 120%, with concentrations found between 1.20 and 3.05 μg l−1 for cd and between 6.98 and 14.4 μg l−1 for mn. the developed method proved to be sensitive, efficient, simple, fast, and having low reagent consumption, and of applicability not previously reported in the literature.