期刊
TALANTA
卷 142, 期 -, 页码 140-144出版社
ELSEVIER
DOI: 10.1016/j.talanta.2015.04.051
关键词
Flow injection analysis (FIA); Gas-diffusion; Solid-liquid extraction; Leaching; Ammonium; Ammonia; Building materials
资金
- Australian Government
- University of Melbourne (Australia)
- Center for Chemical Analysis and Materials Research of St. Petersburg State University (Russia)
A simple, rapid and reliable gas-diffusion flow injection (GD-FI) method for ammonium determination in building materials has been developed. It is based on leaching ammonium from a ground solid sample into an alkaline solution with subsequent ammonia gas generation. Ammonia is then transported in a nitrogen stream to the GD cell of the FI system where it is absorbed into its acceptor solution containing a mixture of the acid-base indicators cresol red and thymol blue. The maximum increase in the absorbance of the acceptor solution at 580 nm is related to the ammonium concentration in the solid sample. The proposed method is characterized by a linear concentration range of 0.1-5.0 mg NH4+ kg(-1), a limit of detection of 8 mu g NH4+ kg(-1) and a sample throughput of 10 h(-1). A successful application of this method for the determination of ammonium in building materials such as concrete, cement and sand is reported. (C) 2015 Elsevier B.V. All rights reserved.
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