etermination of Cadmium in Water Samples by Automated Flow-Batch Cloud Point Extraction (CPE) Hyphenated to High-Resolution Continuum Source Flame Atomic Spectrometry (HR-CS FAAS

Autor(es)

Akiba, Naomi ^[1] ; Mancini, Rodrigo S. N. ^[1] ; Carvalho, Alexandre Zatkovskis ^[1] ; Gaubeur, Ivanise ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC, Ctr Ciencias Nat & Humanas, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Analytical Letters; v. 55, n. 5 AUG 2021.
• Citações Web of Science: 0

Resumo

A computer-controlled multicommuted flow-batch system is reported that allows for the online cloud point extraction of metal ions followed by high-resolution continuum source flame atomic absorption spectrometric (HR-CS GFAAS) detection. This approach combines reduced sample and reagent consumption and a short analysis time with the increased precision and sensitivity characteristic of flow-batch analysis and modern extraction techniques. As proof of concept, cadmium in aqueous solutions was determined by the formation of a hydrophobic complex {[}Cd(PAN)(2)]. Parameters related to complex formation (pH, pyridyl-azo-naphthol-PAN concentration, complexation time), cloud point extraction (Triton X-114 concentration, electrolyte composition, rich phase trapping), and the multicommuted flow-batch system (flow rates, timing control) were optimized. A small column packed with hydrophobic cotton was used as the interface between the extraction and detection stages to stack the cadmium-containing rich phase in a short plug. Optimized parameters led to a 5.0 to 75.0 mu g L-1 linear range, 1.3 mu g L-1 limit of detection, 4.3 mu g L-1 limit of quantification and 1.8% coefficient of variation (n = 12). Accuracy was evaluated by analyzing a certified reference material EP-H (drinking water) and by recovery tests employing tap water, groundwater, mineral water, and reuse water samples. (AU)

• Processo FAPESP: 11/19730-3 - Emprego da extração em ponto nuvem (CPE) e da microextração líquido-líquido dispersiva (DLLME) no desenvolvimento de métodos analíticos para a pré-concentração e determinação espectrométrica de metais
• Beneficiário: Ivanise Gaubeur
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/23878-0 - Consolidação e inovação da linha de pesquisa: desenvolvimento de métodos analíticos combinados a microextração em fase líquida
• Beneficiário: Ivanise Gaubeur
• Modalidade de apoio: Auxílio à Pesquisa - Regular