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A Sensitive Single Particle-ICP-MS Method for CeO₂ Nanoparticles Analysis in Soil during Aging Process.

Wenyan Liu^1,2, Honglan Shi^1,2,3, Kun Liu^1,3

¹Department of Chemistry, Missouri University of Science and Technology, Rolla, Missouri 65409, United States.

Journal of Agricultural and Food Chemistry

|January 15, 2021

Summary

A new method using single particle-inductively coupled plasma-mass spectrometry (SP-ICP-MS) effectively detects engineered cerium dioxide nanoparticles (CeO2 NPs) in soil. This advancement aids environmental monitoring of nanoparticles.

Keywords:

environmental fate of CeO2 nanoparticles single particle (SP)-ICP-MS soil aging soil extraction tetrasodium pyrophosphate

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Area of Science:

Environmental Science
Analytical Chemistry
Materials Science

Background:

Engineered nanoparticles (ENPs) are increasingly used in products, necessitating environmental risk assessment.
Investigating cerium dioxide nanoparticles (CeO2 NPs) in complex soil matrices presents significant analytical challenges.
Limited methods exist for accurately quantifying CeO2 NPs within soil environments.

Purpose of the Study:

To develop and validate a sensitive method for detecting CeO2 NPs in soil.
To overcome analytical limitations in soil nanoparticle analysis.
To assess the stability of CeO2 NPs in soil over a short aging period.

Main Methods:

Utilized a novel single particle-inductively coupled plasma-mass spectrometry (SP-ICP-MS) technique.
Employed tetrasodium pyrophosphate (TSPP) as an aqueous extractant for soil samples.
Determined detection limits for particle size (15 nm) and concentration (194 NPs mL⁻¹).

Main Results:

The SP-ICP-MS method demonstrated high sensitivity for CeO2 NP detection in soil.
Effective extraction of CeO2 NPs was achieved using TSPP within a 1-10 mM concentration range and a 1:100 soil-to-extractant ratio.
CeO2 NP properties (size, distribution, concentration) remained stable in soil for one month.

Conclusions:

An efficient and accurate method for extracting and determining CeO2 NPs in soil was established.
This methodology provides a valuable tool for routine soil testing and research involving nanoparticles.
The findings support the environmental monitoring of engineered nanoparticles in terrestrial ecosystems.