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Published on: September 1, 2017
[Determination of trace silver by flame atomic absorption spectrometry using chitosan enriching method]
Jian-min Sun1, Peng Xu, Xue-tao Han
1College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
This study introduces a chitosan-based method for accurately measuring trace silver using flame atomic absorption spectrometry. The optimized technique effectively enriches silver from wastewater samples, ensuring reliable quantification.
Area of Science:
- Analytical Chemistry
- Environmental Chemistry
Context:
- Accurate determination of trace silver is crucial for environmental monitoring and industrial processes.
- Flame atomic absorption spectrometry (FAAS) is a common technique, but often requires pre-concentration for trace analytes.
- Chitosan, a biopolymer, offers potential for selective adsorption and pre-concentration of metal ions.
Purpose:
- To develop and optimize a chitosan-based enrichment method for the determination of trace silver.
- To investigate the optimal conditions for silver adsorption onto chitosan.
- To assess the selectivity and applicability of the method for real-world samples, such as wastewater.
Summary:
- A novel method utilizing chitosan for the pre-concentration of trace silver prior to flame atomic absorption spectrometry (FAAS) determination was investigated.
- Optimal adsorption conditions were identified, including a sample flow rate of 1 mL/min and a pH of 6.0, achieving 96.7% sorption.
- The method demonstrated a high saturated adsorption capacity of 97.8 mg/g for silver and showed excellent tolerance to common interfering ions, with successful application to wastewater analysis yielding a 94.3% recovery.
Impact:
- Provides a cost-effective and efficient pre-concentration technique for trace silver analysis.
- Enhances the sensitivity and accuracy of FAAS for environmental and industrial monitoring.
- Demonstrates the utility of chitosan as a sorbent material in analytical chemistry for heavy metal determination.
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