Speciation Analysis of Antimony (III) and Antimony (V) by Flame Atomic Absorption Spectrometry After Separation/Preconcentration With Cloud Point Extraction |
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Authors: | Zhefeng Fan |
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Institution: | (1) Department of Chemistry, Shanxi Normal University, 041004 Linfen, PR China |
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Abstract: | A sensitive and simple method for flame atomic absorption spectrometry (FAAS) determination of antimony species after separation/preconcentration
by cloud point extraction (CPE) has been developed. When the system temperature is higher than the cloud point extraction
temperature, the complex of antimony (III) with N-benzoyl-N-phenyhydroxylamine (BPHA) can enter the surfactant-rich phase,
whereas the antimony (V) remains in the aqueous phase. Antimony (III) in surfactant-rich phase was analyzed by FAAS and antimony
(V) was calculated by subtracting of antimony (III) from the total antimony after reducing antimony (V) to antimony (III)
by L-cysteine. The main factors affecting the cloud point extraction, such as pH, concentration of BPHA and Triton X-114,
equilibration temperature and time, were investigated systematically. Under optimized conditions, the detection limits (3σ)
were 1.82 ng mL−1 for Sb(III) and 2.08 ng mL−1 for Sb(total), and the relative standard deviations (RSDs) were 2.6% for Sb(III) and 2.2% for Sb(total). The proposed method
was applied to the speciation of antimony species in artificial seawater and wastewater, and recoveries in the range of 95.3–106%
were obtained by spiking real samples. This technique was validated by means of reference water materials and gave good agreement
with certified values. |
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Keywords: | : Speciation of antimony cloud point extraction flame atomic absorption spectrometry water |
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