Natural organic matter (NOM) is ubiquitous in aqueous systems and dynamically partitions onto/from environmental surfaces. However, such interfacial processes have not been uniformly quantified in situ and in real time. In this work, adsorption and deposition processes of Suwannee River humic acid (SRHA) and Suwannee River fulvic acid (SRFA), as model NOM, were evaluated for a series of environmentally relevant interfaces. Real-time, interfacial phenomenon, including deposition, release, and adlayer viscoelastic properties, were quantified over a variety of water chemistries via quartz crystal microbalance with dissipation monitoring (QCM-D). Specifically, adlayer mass and deposition rates of SRHA and SRFA were evaluated as a function of NOM concentration/molecular weight (fraction), pH, electrolyte composition (type and concentration), and collector surface type. For these, the adsorption of SRHA onto aluminum oxide (Al₂O₃) and polystyrene (PS) surfaces follows the Langmuir isotherm model. Rapid, near-monolayer formation of SRHA/SRFA adlayers were observed on Al₂O₃, hydroxyapatite (HAP), and poly (l-lysine) (PLL) surfaces, but not on PS or iron oxide (Fe₃O₄) surfaces. The presence of divalent cations (Ca²⁺/Mg²⁺) at relatively low concentrations (0.5–5.0 mM) significantly enhances the mass of SRHA/SRFA deposited onto the surfaces of silica (SiO₂), Al₂O₃, and PS. Viscoelastic properties of the adsorbed layer based on the ratio of dissipation to frequency revealed a relatively unique adlayer structure for SRHA in the presence of 5.0 mM Ca²⁺.

天然有机物（NOM）在水系统中无处不在，并动态分配到环境表面上或从环境表面动态分配。但是，这种界面过程尚未在原位和实时进行统一量化。在这项工作中，作为一系列NOM模型，对Suwannee河腐殖酸（SRHA）和Suwannee河黄腐酸（SRFA）的吸附和沉积过程进行了一系列环境相关界面的评估。实时的界面现象，包括沉积，释放和吸附层粘弹性，可以通过多种水化学方法通过带有耗散监测的石英晶体微天平（QCM-D）。具体而言，根据NOM浓度/分子量（分数），pH，电解质组成（类型和浓度）和集电体表面类型来评估SRHA和SRFA的附加层质量和沉积速率。为此，SRHA在氧化铝（Al ₂ O ₃）和聚苯乙烯（PS）表面上的吸附遵循Langmuir等温模型。在Al ₂ O ₃，羟基磷灰石（HAP）和聚（l-赖氨酸）（PLL）表面上观察到快速，近乎单层的SRHA / SRFA形成层，但在PS或氧化铁（Fe ₃ O ₄）表面上没有观察到。二价阳离子（Ca ²⁺/ Mg ²⁺）以相对较低的浓度（0.5-5.0 mM）可以显着提高沉积在二氧化硅（SiO ₂），Al ₂ O ₃和PS表面上的SRHA / SRFA的质量。基于耗散与频率之比的吸附层的粘弹性质表明，在存在5.0 mM Ca ²⁺的情况下，SRHA的吸附层结构相对独特。