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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Humic Substance Adsorptive Fractionation by Minerals and its Subsequent Effects on Pyrene Sorption Isotherms
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Humic Substance Adsorptive Fractionation by Minerals and its Subsequent Effects on Pyrene Sorption Isotherms

机译：矿物对腐殖质的吸附分离及其对on吸附等温线的影响

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Changes in the nonlinearity of pyrene sorption isotherms on humic substance (HS)-coated minerals (kaolinite and hematite) due to HS adsorptive fractionation processes were examined in model environmental systems at low mass fraction organic carbon (f_(oc)) levels (0.0001-0.0011) using purified Aldrich humic acid (PAHA) and Suwannee River fulvic acid (SRFA). At a constant pH of 7, higher molecular weight (MW) fractions of PAHA were preferentially adsorbed on kaolinite whereas no adsorptive fractionation of PAHA occurred on hematite. At a constant f_(oc) level of 0.0005, preferential adsorption of higher MW PAHA fractions on kaolinite was enhanced with increasing pH. Nonlinear pyrene sorption isotherms were observed with the bulk PAHA-coated mineral systems, whereas more linear pyrene sorption isotherms were observed for the PAHA-mineral systems undergoing adsorptive fractionation. Although the degree of isotherm linearity may be affected by pH and/or structural rearrangement of the adsorbed HS fractions on minerals, this study suggests that HS adsorptive fractionation is more important than are changes in pH and f_(oc) levels with regard to the resulting pyrene sorption isotherms. Similar effects were not observed with SRFA, suggesting that the impacts of HS adsorptive fractionation on pyrene sorption isotherm nonlinearity are also influenced by the source and other biogeochemical characteristics of HS.
机译：在模型环境系统中低质量分数有机碳（f_（oc））（0.0001-0.0001）的模型环境系统中，研究了HS吸附分馏过程导致的腐殖质（HS）涂层矿物（高岭石和赤铁矿）上吸附等温线的非线性变化。 0.0011）使用纯化的奥尔德里奇腐殖酸（PAHA）和苏万尼河富里酸（SRFA）。在7的恒定pH值下，高分子量（PA）的PAHA优先吸附在高岭石上，而在赤铁矿上未发生PAHA的吸附分离。在0.0005的恒定f_（oc）水平下，随着pH值的增加，较高分子量的PAHA组分优先吸附在高岭石上。在大量的PAHA涂层矿物系统中观察到非线性吸附等温线，而PAHA矿物系统经历吸附分馏时观察到更多的线性pyr吸附等温线。尽管等温线的线性程度可能受pH和/或矿物上吸附的HS馏分的结构重排的影响，但这项研究表明，HS吸附分级对pH值和f_（oc）水平变化的影响更为重要。吸附等温线。 SRFA并未观察到类似的效果，这表明HS吸附分级对pyr吸附等温线非线性的影响也受到HS的来源和其他生物地球化学特征的影响。

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