Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5139024 | Microchemical Journal | 2017 | 38 Pages |
Abstract
A method for antimony speciation by cloud point extraction (CPE) was optimized and validated in house. The pre-concentration method was based on the selective cloud point extraction of Sb(III) after its complexation with ammonium pyrrolidine dithiocarbamate (APDC) at pH 2.0, separation of a surfactant rich phase on the cloud point of the non-ionic surfactant (Triton X-114) and subsequent determination by Electrothermal Atomic Absorption Spectrometry (ET AAS). Sb(V) was not extracted at pH 2.0. Total Sb was determined after reducing Sb(V) to Sb(III) by l-cysteine. Then, concentration of Sb(V) was calculated by subtracting Sb(III) from total antimony. The main factors affecting separation/pre-concentration were investigated using univariate and multivariate approach. The detection limit for Sb(III) was 0.06 μg Lâ 1, the enrichment factor for this determination was 12, and the relative standard deviation (RSD) was < 5.9%. The proposed method was applied for the speciation of inorganic Sb in different water samples with satisfactory results. For the first time, a case study was conducted with Brazilian mineral waters stored in PET bottles in the speciation of Sb. The results showed that Sb(III) concentrations ranged from 1.8 ± 0.3 μg Lâ 1 to 3.2 ± 0.2 μg Lâ 1. The Sb(V) values ranged from 0.63 ± 0.01 μg Lâ 1 to 1.88 ± 0.01 μg Lâ 1.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
Jucimara Kulek de Andrade, Camila Kulek de Andrade, Maria Lurdes Felsner, Sueli Pércio Quináia, Vanessa Egéa dos Anjos,