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Determination of cyanide by a flow injection analysis-atomic absorption spectrometric method
A V López Gómez1, J Martínez Calatayud
1Departamento de Química Analítica, Universidad de Valencia, Spain.
The Analyst
|April 21, 1999
Summary
A novel flow injection analysis (FIA) method offers a selective and rapid way to determine cyanide levels. This technique utilizes a silver iodide solid-phase reactor for accurate indirect atomic absorption spectrometry measurements.
Area of Science:
- Analytical Chemistry
- Environmental Chemistry
Background:
- Cyanide determination is crucial for environmental monitoring and industrial quality control.
- Existing methods for cyanide analysis can be complex, time-consuming, or lack selectivity.
Purpose of the Study:
- To develop a new, efficient, and selective flow injection analysis (FIA) procedure for cyanide determination.
- To validate the proposed method using atomic absorption spectrometry (AAS).
Main Methods:
- A flow injection analysis (FIA) manifold was designed using a distilled water carrier.
- A solid-phase reactor packed with silver iodide entrapped in polymeric resin beads was employed.
- Indirect atomic absorption spectrometry was used for cyanide quantification.
Main Results:
- The method demonstrated linearity for cyanide concentrations from 0.2-6.0 mg l-1 (R²=0.9974).
- A low detection limit of 0.1 mg l-1 and high sample throughput of 193 h-1 were achieved.
- Excellent reproducibility (RSD=0.8%) and good selectivity were observed.
Conclusions:
- The developed FIA method provides a simple, rapid, and selective approach for cyanide analysis.
- The method is suitable for determining cyanide in diverse real-world samples, including pharmaceuticals and industrial baths.