Differences in soil solution chemistry between soils amended with nanosized CuO or Cu reference materials : implications for nanotoxicity tests

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DOIResolve DOI: http://doi.org/10.1021/es500141h
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TypeArticle
Journal titleEnvironmental Science and Technology
ISSN0013-936X
Volume48
Issue14
Pages81358142; # of pages: 8
SubjectCalcium; Metal nanoparticles; Micrometers; Chemical forms; Different effects; Metal oxide nanoparticles; Mg concentrations; Nanometer-sized particles; Reference material; Soil solution chemistry; Soil toxicity tests; Soil moisture; copper; copper oxide; copper compound; nanotechnology; particle size; pH; soil amendment; toxicity test; article; light scattering; particle size; pH; soil amendment; soil analysis; soil pollution; transmission electron microscopy; Cations; Copper; Hordeum; Hydrogen-Ion Concentration; Nanoparticles; Particle Size; Powders; Reference Standards; Soil; Soil Pollutants; Solubility; Solutions; Time Factors; Toxicity Tests
AbstractSoil toxicity tests for metal oxide nanoparticles often include micrometer-sized oxide and metal salt treatments to distinguish between toxicity from nanometer-sized particles, non-nanometer-sized particles, and dissolved ions. Test result will be confounded if each chemical form has different effects on soil solution chemistry. We report on changes in soil solution chemistry over 56 days-the duration of some standard soil toxicity tests-in three soils amended with 500 mg/kg Cu as nanometer-sized CuO (nano), micrometer-sized CuO (micrometer), or Cu(NO3)2 (salt). In the CuO-amended soils, the log Cu2+ activity was initially low (minimum -9.48) and increased with time (maximum -5.20), whereas in the salt-amended soils it was initially high (maximum -4.80) and decreased with time (minimum -6.10). The Cu2+ activity in the nano-amended soils was higher than in the micrometer-amended soils for at least the first 11 days, and lower than in the salt-amended soils for at least 28 d. The pH, and dissolved Ca and Mg concentrations in the CuO-amended soils were similar, but the salt-amended soils had lower pH for at least 14 d, and higher Ca and Mg concentrations throughout the test. Soil pretreatments such as leaching and aging prior to toxicity tests are suggested.
Publication date
LanguageEnglish
AffiliationAquatic and Crop Resource Development; National Research Council Canada
Peer reviewedYes
NPARC number21272740
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Record identifier8603ab61-af75-4212-ae45-b99c5e982abb
Record created2014-12-03
Record modified2016-05-09
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