Solid-Phase Extraction of Cd(II) as Diethyldithiocarbamate Complex by Polyurethane Foam: Kinetic and Thermodynamic Characterization

Ana, Otoniel D. Sant; Jesuino, Luciene S.; Cassella, Ricardo J.; Carvalho, Marcelo Souza de; Santelli, Ricardo Erthal

doi:10.1081/ss-200026767

Cited by 18 publications

(1 citation statement)

References 22 publications

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“…Therefore, it is important to change them into a form that can be sorbed by a solid phase. We have previously demonstrated that dithiocarbamate complexes of metallic cations have a great affinity with polyurethane foam [ 19 , 20 ], being extracted through a mechanism similar to solvent extraction, in which PUF acts as a solid solvent [ 15 ]. In this work, we explored the formation of APDC complexes of Cd(II) and Pb(II) to create a “molecule” able to be retained by the foam.…”

Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Digestion of Polyurethane Foam as an Alternative to Elution: Solid Phase Extraction of Cd(II) and Pb(II) for Their Determination in Swimming Pool Waters

Sousa

Cruz

Santos

et al. 2023

Journal of Analytical Methods in Chemistry

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In this work, a separation/preconcentration method is proposed for the determination of Cd(II) and Pb(II) in swimming pool waters, using ammonium pyrrolidine dithiocarbamate (APDC) as a complexing agent and unloaded polyurethane foam (PUF) as a sorbent. The proposed method was optimized, and the defined optimal conditions were a pH of 7, 30 min of shaking time, 400 mg of PUF, and 0.5% (m/v) of the APDC solution. The release of Cd(II) and Pb(II) from the solid phase was achieved through the total digestion of PUF using a microwave-assisted acid approach with a 10.5 mol·L−1 HNO3 solution. The methodology was applied to four samples of swimming pool water for the determination of Cd(II) and Pb(II) using graphite furnace atomic absorption spectrometry (GF AAS). The limits of detection and quantification obtained were 0.02 and 0.06 μg·L−1 for Cd(II) and 0.5 e 1.8 μg·L−1 for Pb(II), respectively. We analyzed four samples of swimming pool waters, finding Cd concentrations between 0.22 and 1.37 μg·L−1. On the other hand, only one sample presented Pb concentration above the limit of quantification (11.4 μg·L−1). Recovery tests were performed by spiking the samples with known concentrations of the analytes, and recovery percentages between 82% and 105% were obtained.

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Section: Resultsmentioning

confidence: 99%