Retention of Sterically and Electrosterically Stabilized Silver Nanoparticles in Soils

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• 作者：Martin Hoppe ; Robert Mikutta ; Jens Utermann ; Wilhelmus Duijnisveld ; Georg Guggenberger
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：November 4, 2014
• 年：2014
• 卷：48
• 期：21
• 页码：12628-12635
• 全文大小：301K
• ISSN：1520-5851

文摘

The current study investigated the interaction of sterically stabilized OECD standard Ag ENP (AgNM-300k) and silver ions (Ag⁺) in 25 German arable soils with varying properties (organic carbon concentration of 0.4鈥?5 mg g^鈥? and clay content of <0.1鈥?92 mg g^鈥?) in 24 h batch retention experiments. A soil subset (n = 8) was investigated to test the soil interactions with citrate-stabilized Ag ENP (AgCN30). The adsorption of Ag⁺ was consistent with the Freundlich model with high K_F values (mean K_F = 2553 L kg^鈥?, n = 25), which suggested a high retention of Ag⁺. The retention of AgNM-300k followed a linear partitioning model and generally exhibited a low retention for the majority of the investigated soils (group 1, mean K_r,聽linear = 3.7 L kg^鈥?, n = 19), and was correlated with the clay content (relation to log₁₀(K_r,聽linear), r² = 0.40, n = 19). Soils showing a high retention of AgNM-300k (group 2, mean K_r,聽linear = 1048 L kg^鈥?, n = 6) either had a low (<5.1) or high pH (>7.0) and generally contained >200 mg g^鈥? clay. For the sample subset tested, AgCN30 and AgNM-300k were retained in similar dimensions regarding the same soils. The results suggest that the highest risk of long-term ENP mobilization exists when Ag ENP are applied to agricultural soils with low clay contents (<130 mg g^鈥?) and slightly acidic conditions.