The use of cloud point extraction and hydride generation for improving the Sb and Se limits of detection in ICP OES

Journal of the Brazilian Chemical Society

Fernanda Dos Santos Depoi¹  Dirce Pozebon¹ 

[1] ,Universidade Federal do Rio Grande do Sul Instituto de Química Porto Alegre RS ,Brazil

关键词: Sb and Se;    cloud point extraction;    ICP OES;    hydride generation;    pneumatic nebulization;   

DOI  :  10.1590/S0103-50532012001200010

来源: SciELO

【 摘 要 】

This study deals with the application of cloud point extraction (CPE) and hydride generation (HG) for determination of Sb and Se using inductively coupled plasma optical emission spectrometry (ICP OES). The complexing agent was ammonium diethylditiophosphate (DDTP), whereas Triton X-114 was used as surfactant for the formation of micelles. Conditions for Sb(III) and Se(IV) preconcentration, reduction of Se(VI) and Sb(V), hydrides generation and interferences were discussed. The performance of HG was compared with pneumatic nebulization (PN) for introducing the surfactant-rich phase into the plasma. Upon application of HG, the limits of detection (LODs) for Se(IV) and Sb(III) were 0.05 and 0.08 µg L-1, respectively. Limits of detection using PN were 0.90 and 2.90 ug L-1 for Se(IV) and Sb(III), respectively. Samples of nuts, water and white wine were analyzed. Selenium(IV) was quantified in Brazil nut whereas Sb(III) was in estuarine water, seawater and mineral water stored in polyethylene terephthalate (PET) bottle.

【 授权许可】

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