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首页> 外文期刊>Journal of Environmental Science and Health >Sorption of nonpolar neutral organic compounds to low-surface-area metal (hydr)oxide- and humic acid- coated model aquifer sands
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Sorption of nonpolar neutral organic compounds to low-surface-area metal (hydr)oxide- and humic acid- coated model aquifer sands

机译：非极性中性有机化合物对低表面积金属（氢）氧化物和腐殖酸涂层模型含水层砂的吸附

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摘要

The roles of mineral-bound humic acid (HA) and mineral surfaces in the sorption of six nonpolar neutral organic compounds with relatively high aqueous solubility, 5,,,, (1,2,4-trichlorobenzene, 1,4-dichlorobenzene, chlorobenzene, m-xylene, toluene, and benzene) to low-surface-area (i.e., < 1.2 m~2/g) metal (hydr)oxide- and HA-coated sands with low organic carbon fractions (i.e., 0.006% < f_(oc)≤0.044%) were investigated using well-characterized mineral surfaces [i.e., α-FeO(OH)- or Al_2O_3- coated sands], terrestrial HA, and solutions with relatively constant pH and ionic strength. Sorption isotherms of all six compounds to low-surface-area metal (hydr)oxide-and HA-coated sands were practically linear (i.e., 0.898 < n < 1.06), and resulted from a combination of sorption to both mineral-bound HA and mineral surfaces, with the dominance of either contribution depending on the properties of the sorbents (e.g., f_(oc)) and organic compounds (e.g., S_w and K_(ow)). Compared to HA-associated high-surface-area, pure metal (hydr)oxides or clay minerals illustrating that loading levels of HA significantly impacted sorption affinity (i.e., K_(oc)) and linearity (i.e., ri) for particularly hydrophobic compounds (i.e., phenanthrene, anthracene and pyrene) due to the changes in fractionation, and structural and chemical properties of mineral-bound HA, the subsequent changes of sorption affinity and linearity appeared to be insignificant for the sorption of organic compounds with relatively high S_w to low-surface-area metal (hydr)oxide- and HA-coated sands with low f_(oc) values. Thus, the predictive models for the sorption of organic compounds with relatively high S_w to low-surface-area metal (hydr)oxide- and HA-coated sands may not be remarkably improved by incorporating the complex changes of sorption affinity and linearity caused by the changes in fractionation, and structural and chemical properties of mineral-bound HA, although the mineral surfaces apparently caused physical and chemical changes of HA, and vice versa during adsorption onto mineral surfaces.
机译：矿物结合的腐殖酸（HA）和矿物表面在六种具有相对较高水溶性的非极性中性有机化合物的吸附中的作用5 ,,,（1,2,4-三氯苯，1,4-二氯苯，氯苯，间二甲苯，甲苯和苯）到低表面积（即<1.2 m〜2 / g）的金属（氢）氧化物和HA涂层砂中，有机碳含量低（即0.006％

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