Cation treatment and drying‐temperature effects on nonylphenol and phenanthrene sorption to a sandy soil
Cation treatment and drying‐temperature effects on nonylphenol and phenanthrene sorption to a sandy soil
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阳离子处理和干燥温度对沙土吸附壬基酚和菲的影响
DOI：
10.1002/jpln.201200503
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发表时间：
2014
影响因子：
2.5
通讯作者：
B. Marschner
中科院分区：
文献类型：
--
作者：
Anastasia Shchegolikhina;Yamuna Kunhi Mouvenchery;S. Woche;J. Bachmann;G. Schaumann;B. Marschner
研究了一价和多价阳离子对壬基酚（NP）和菲（Phe）两种疏水性化合物吸附的影响。为此，交换网站的桑迪土壤饱和的Na+，Ca 2+，或Al 3+和多余的盐通过洗涤除去。然后将样品灭菌并在通风烘箱中潮湿储存、在室温下干燥或在20°C、60°C或105°C下干燥。1H-NMR弛豫分析表明，Al 3+对土壤有机质结构中水分子流动性的限制作用大于Ca 2+和Na+，而Ca 2+和Al 3+则使土壤有机质结构中水分子流动性降低。根据接触角（CA）分析，阳离子处理没有显着改变样品的润湿性能。批吸附-解吸实验表明，没有明确的盐处理NP和苯丙氨酸的吸附和解吸平衡或动力学的影响。相反，NP和Phe的吸附系数和吸附滞后增加在干燥的土壤。随着干燥温度的升高，土壤的CA和对两种外源性物质的吸附显着增加。我们的结论是，由于将多价阳离子的界面结构的SOM的结构修改不修改疏水化合物的土壤的吸附特性。相反，增加疏水化的有机土壤成分，由于热处理显着增加了非极性有机化合物在这种土壤中的可访问的吸附位点。
The objective of this study was to investigate the effects of mono- and polyvalent cations on sorption of the two hydrophobic compounds nonylphenol (NP) and phenanthrene (Phe). To this end, exchange sites of a sandy soil were saturated with either Na+, Ca2+, or Al3+ and excess salts were removed by washing. The samples were then sterilized and either stored moist, dried at room temperature, or at 20°C, 60°C, or 105°C in a vented oven. Saturation with Na+ led to an increase of dissolved organic C (DOC) concentration in the soil water extracts, whereas the polyvalent cations Ca2+ and Al3+ decreased it. The 1H-NMR relaxometry analyses showed that Al3+ restricted the mobility of water molecules that are confined within the SOM structure to a higher extent than Ca2+ or Na+. According to contact-angle (CA) analyses, cation treatment did not significantly change the wetting properties of the samples. Batch sorption–desorption experiments showed no clear salt-treatment effects on the sorption and desorption equilibria or kinetics of NP and Phe. Instead, the sorption coefficients and sorption hysteresis of NP and Phe increased in dry soil. With increasing drying temperature the CA of the soils and the sorption of both xenobiotics increased significantly. We conclude that structural modifications of SOM due to incorporation of polyvalent cations into the interphase structure do not modify the sorption characteristics of the soil for hydrophobic compounds. Instead, increasing hydrophobization of organic soil constituents due to heat treatment significantly increased the accessible sorption sites for nonpolar organic compounds in this soil.
影响因子：
11.4
作者：
Jixin Tang;W. Weber
通讯作者：
Jixin Tang;W. Weber