Nanomaterial Characterization in Complex Media-Guidance and Application.

Area of Science:

• Environmental Science
• Analytical Chemistry
• Toxicology

Background:

• Inorganic nanoparticles (NPs) and their dissolved ions pose risks to human health and ecosystems.
• Accurate measurement of NP dissolution is challenging due to complex sample matrices.
• Understanding NP behavior in biological and environmental fluids is critical for risk assessment.

Purpose of the Study:

• To evaluate analytical techniques for characterizing copper oxide (CuO) NPs in complex matrices.
• To develop and validate a direct-injection single particle inductively-coupled plasma mass spectrometry (DI spICP-MS) method.
• To enable accurate differentiation between NPs and dissolved ions for toxicity studies.

Main Methods:

• Investigated CuO NPs dissolution using dynamic light scattering (DLS) and ICP-MS.
• Applied DI spICP-MS for size distribution analysis of dissolved particles in undiluted complex matrices.
• Developed automated data evaluation for distinguishing NP and ionic events.

Main Results:

• DLS and ICP-MS provided time-dependent NP characterization in artificial lung lining fluids and cell culture media.
• The DI spICP-MS technique demonstrated high sensitivity for detecting dissolved particles at low concentrations.
• Automated data analysis enabled fast and reproducible determination of NPs and ionic backgrounds.

Conclusions:

• The DI spICP-MS method offers a sensitive and robust approach for NP characterization in complex matrices.
• Accurate differentiation of NPs from dissolved ions is essential for understanding NP toxicity.
• This study provides guidance for selecting analytical methods in NP risk assessment.