Interferences in the atomic-absorption: determination of silicon

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Accurate determination of silicon is crucial in various scientific and industrial applications.
• Atomic Absorption Spectroscopy (AAS) is a common technique for elemental analysis.
• Potential interferences can affect the accuracy of AAS measurements for silicon.

Purpose of the Study:

• To investigate the interfering effects of common acids and metal ions on silicon determination by AAS.
• To examine the additive effects of interferents, particularly in ternary systems with aluminum.
• To identify substances that enhance or suppress silicon absorption signals.

Main Methods:

• Systematic investigation of individual substances (HCl, HNO3, H2SO4, Na+, K+, Cs+, Al3+, Ni2+, Mn2+, Fe3+, V5+, Mg2+, Cu2+, Zn2+, Ti4+) for their effect on silicon absorption.
• Analysis of ternary systems involving aluminum to assess combined interference effects.
• Measurement of silicon absorption using Atomic Absorption Spectroscopy (AAS).

Main Results:

• Most investigated substances, including Al3+, Mn2+, Fe3+, V5+, Mg2+, and Ti4+, enhanced silicon absorption.
• Hydrochloric acid (HCl), nitric acid (HNO3), sulfuric acid (H2SO4), and nickel (Ni2+) demonstrated depressive effects on silicon absorption.
• The interference from copper (Cu2+) and zinc (Zn2+) was found to be negligible.

Conclusions:

• Understanding these interference effects is critical for accurate silicon quantification using AAS.
• Specific ions and acids can significantly alter silicon signal intensity, requiring careful method development.
• The findings provide valuable data for optimizing AAS methods for silicon analysis in complex matrices.