Graziele Santos SALES, Rebeca Moraes MENEZES, Valfredo Azevedo LEMOS, Rafael Vasconcelos OLIVEIRA, Uelber Silva VIEIRA, Mardson Vasconcelos MACIEL, Thais Souza NERI

Development of a method for the determination of cadmium levels in seawater by ame atomic absorption spectrometry using an online cloud-point extractionsystem

A new system was developed for the preconcentration and determination of cadmium levels in water followingonline cloud-point extraction and analysis by ame atomic absorption spectrometry. The method uses cloud-pointextraction of the complex formed between Cd(II) ions and the reagent 2-(5-bromo-2'-thiazolylazo)-p-cresol (Br-TAC)using Triton X-114 as a surfactant. The main steps of the procedure, extraction, ltration, and detection were conductedonline. Parameters that in uence the experimental conditions of online preconcentration systems were examined,including pH, concentration of reagent and surfactant, and ow of sample and eluent. The limit of detection of themethod is 0.2 g L1. The preconcentration system exhibits an enrichment factor of 19, an analytical frequency of60 h1, and a consumptive index of 0.12 mL. The procedure was applied to the determination of cadmium levels inseawater samples.

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