Effect of Soil Organic Matter, Soil pH, and Moisture Content on Solubility and Dissolution Rate of CuO NPs in Soil

• DOI: 10.1021/acs.est.8b07243
• Publication Date: 2019-03-28T20:02:03Z
• Authors: Xiaoyu Gao; Sónia M. Rodrigues; Eleanor Spielman-Sun; Sónia Lopes; Sandra Rodrigues; Yilin Zhang; Astrid Avellan; Regina M.B.O. Duarte; Armando Duarte; Elizabeth A. Casman; Gregory V. Lowry
• Keywords: [SDE] Environmental Sciences; Soil; Solubility; Nanoparticles; Hydrogen-Ion Concentration; 15. Life on land; 01 natural sciences; Copper; 6. Clean water; 0105 earth and related environmental sciences

The objectives of this research were to quantify the impact organic matter content, soil pH and moisture content on dissolution rate solubility copper oxide nanoparticles (CuO NPs) in soil, develop an empirical model predict kinetics CuO NPs soil. dosed into standard LUFA soils with various carbon content. Chemical extractions applied measure NP kinetics. Doubling reactive 2.1 increased 2.7-fold but did not change constant. Increasing from 5.9 6.8 2.2 decreased constant 0.56 mol1/3·kg1/3·s–1 0.17 without changing For six soils, correlated well (R2 = 0.89) independent pH. In contrast, for < 6.3 0.89), These relationships predicted constants two test (pH 5.0 7.6). Moisture showed negligible NPs. Our study suggests that affect behavior a predictable manner.