Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10561146 | Talanta | 2005 | 5 Pages |
Abstract
Cloud point extraction was applied as a preconcentration step for electrothermal atomic absorption spectrometry (ETAAS) determination of As(III) in aqueous solutions. After complexation with ammonium pyrrolidinedithiocarbamate, the analyte was quantitatively extracted to the surfactant-rich phase in the non-ionic surfactant octylphenoxypolyethoxyethanol (Triton X-114) after centrifugation. 0.1 mol Lâ1 HNO3 in methanol was added to the surfactant-rich phase before ETAAS determination. The precision (R.S.D.) for 11 replicate determinations of 5.0 μg Lâ1 of As(III) was 3.0%. The concentration factor, which is defined as the concentration ratio of the analyte in the final diluted surfactant-rich extract ready for ETAAS determination and in the initial solution, was 36 for As(III). The linear concentration range was from 0.1 to 20 μg Lâ1. The developed method was applied to the determination of As(III) in lake water and river water.
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
An-na Tang, Guo-sheng Ding, Xiu-ping Yan,