Multi-Element Analysis of Foods using Fast Sequential-Flame AAS

Importance of the Topic

Atomic absorption spectrometry is a cornerstone technique in food analysis for verifying nutritional content and ensuring safety in global food trade

Objectives and Study Overview

This study demonstrates how an automated fast sequential FAAS method coupled with a sampling pump system can enhance throughput, accuracy, and reliability for multi element food analysis, targeting nine elements in certified reference materials

Methodology and Instrumentation

An Agilent 280FS flame atomic absorption spectrometer was operated in fast sequential mode with eight lamps including multi element sources and controlled by SpectrAA software. An Agilent SIPS 20 accessory performed inline calibration, sample dilution, and reagent addition. The PROMT function of SpectrAA optimized read times based on required precision for each element

Main Results and Discussion

The fast sequential approach reduced analysis time compared to conventional FAAS methods while maintaining high precision. Recovery data for K Na Ca Cu Mg Mn Fe Ni and Zn in an orchard leaves reference material fell within 99 to 110 percent of certified values. A stability study over 4 hours and 19 minutes without recalibration yielded relative standard deviations below 5 percent for all elements, demonstrating robust performance

Benefits and Practical Applications of the Method

• High sample throughput enabling analysis of up to 100 food samples per day
• Reduced risk of contamination and human error through automated sample preparation
• Efficient use of reagents and minimal remeasurements through inline dilution and calibration
• Adaptable precision control via PROMT for elements across wide concentration ranges

Future Trends and Opportunities

• Expansion of fast sequential AAS methods to additional elements and complex matrices
• Advances in software driven automation for enhanced method development and quality control
• Integration with hyphenated techniques for comprehensive food safety screening
• Development of miniaturized or portable FAAS systems for field applications

Conclusion

The combination of fast sequential FAAS, SIPS sampling automation and PROMT precision optimization offers a streamlined workflow for reliable multi element food analysis. This approach addresses throughput, accuracy and cost challenges in modern food quality control

Instrumentation

• Agilent 280FS flame atomic absorption spectrometer
• Agilent SIPS 20 sampling pump system
• SpectrAA software with PROMT function