Dynamic exchanges between DOM and POM pools in coastal and inland aquatic ecosystems: A review

He, Wei; Chen, Meilian; Schlautman, Mark A.; Hur, Jin

doi:10.1016/j.scitotenv.2016.02.031

Cited by 170 publications

(106 citation statements)

References 141 publications

Supporting

Mentioning

103

Contrasting

Order By: Relevance

“…Accordingly, the assumed reactions involve anion exchange in the contact zone, hydrophobic displacement in the intermediate zone, and cation or aggregate displacement in the kinetic zone. In their review article, He and coworkers () integrated the multilayer model into a conceptual framework to describe the dynamic exchange between DOM and OM of suspended particles in coastal and inland waters. Here, the multilayer model was directly used without testing.…”

Section: Application Of the Multilayer Model In Soil Science And Relamentioning

confidence: 99%

The multilayer model of soil mineral–organic interfaces—a review

Gao

Mikutta

Jansen

et al. 2019

J. Plant Nutr. Soil Sci.

View full text Add to dashboard Cite

Association of organic matter (OM) with minerals is an important pathway in the formation of stable OM in soil. While the importance of mineral-organic associations (MOA) in regulating soil carbon cycling has been rigorously demonstrated by empirical evidence, knowledge about the molecular-scale arrangement of OM at mineral surfaces is still lacking. Such knowledge is urgently needed to disentangle the mechanisms of long-term storage of soil OM. Based on indirect observations regarding the formation, composition, and structure of MOA, a conceptual multilayer model was proposed by Kleber et al. in 2007 to foster debate and help elucidating the structure and reactivity of MOA. According to this model, the associated OM at mineral surfaces is discrete and self-organized into a multilayer structure. In this review, we aim to collect and evaluate existing studies that used this model to explain biogeochemical processes at mineral-organic interfaces, and based on this, assess the applicability of the model. The multilayer model has seen extensive adoption within soil science and related fields. In general, existing studies either support the concept of a patchy distribution of adsorbed OM on mineral surfaces or advocate that OM can be coprecipitated with nanosized poorly crystalline minerals or hydrolysable metals. However, the evidence for the patchy distribution of adsorbed OM cannot support the multilayer model on its own. There is little consensus about the role of N-rich OM in forming the contact zone according to the multilayer model but surface conditioning by different classes of organic compounds appears to be an essential factor for the overall adsorption of OM. Nevertheless, large uncertainty still remains with respect to multilayer-like organization of MOA. By taking advantage of recent developments in surface analytical sciences and computational chemistry, a rigid experimental testing of the multilayer model at the molecular level is still required and awaits to be integrated into improved concepts of MOA formation and OM stabilization.

show abstract

Section: Application Of the Multilayer Model In Soil Science And Relamentioning

confidence: 99%

The multilayer model of soil mineral–organic interfaces—a review

Gao

Mikutta

Jansen

et al. 2019

J. Plant Nutr. Soil Sci.

View full text Add to dashboard Cite

show abstract

“…Estuary ON composition is affected by both inputs (marine and freshwater) and internal cycling (excretion, mineralization, sloppy feeding, and DIN assimilation). The complexity of the two organic N pools (PN: heterotrophic and autotrophic organisms, detritus, and colloids; DON: organic molecules) makes it most accurate to define them purely in terms of size: PN > 0.45 μ m, DON < 0.45 μ m (Fawcett et al ; Sipler and Bronk ; He et al ). Organic N isotopic composition is useful for whole‐system characterization despite this compositional uncertainty, because the pool turns over slowly relative to DIN and the key processes (assimilation, mineralization) usually have relatively weak effects on δ 15 N (Waser et al ; Knapp et al ) (Fig.…”

Section: Discussionmentioning

confidence: 99%

δ¹⁵N patterns in three subtropical estuaries show switch from nitrogen “reactors” to “pipes” with increasing degradation

Hipsey

Eyre

2018

Limnology & Oceanography

View full text Add to dashboard Cite

Ongoing alterations to estuaries by inland agricultural intensification and coastal development could affect their capacity to regulate the flux of excess terrestrial nitrogen (N) to the coastal ocean. Here, a new multiform δ 15 N metric was developed to measure how "pristine," moderately impacted, and highly degraded estuaries recycle (assimilation, mineralization) and remove (denitrification, anaerobic ammonium oxidation) N. Organic (dissolved and particulate, δ 15 N and δ 13 C) and inorganic (nitrate and ammonium, δ 15 N and δ 18 O) N forms were measured over the salinity gradient in the wet and dry season in subtropical estuaries receiving increasing terrestrial N loads (pristine: 16 kg N d −1 , moderate: 150 kg N d −1 , degraded: 630 kg N d −1 ). The difference in the inorganic vs. organic pool δ 15 N composition increased between the pristine (0 AE 2‰), moderate (10 AE 6‰), and degraded (20 AE 8‰) systems, indicating that N recycling decreased as degradation increased. The N 2 O concentrations, NO 3 − dual isotope values, and offsets between "measured" and "mixing expected" δ 15 N values further revealed that microbial processes removed up to 30% of the N load entering the moderately degraded estuary, but only 9% in the highly degraded estuary. Hydrologic differences (depth and flushing times [FTs]) could not fully explain these shifts in N fate between the estuaries and seasons, which instead aligned with nonlinear increases in phytoplankton biomass and light penetration with increasing N loads. These isotopic indicators provide direct evidence that estuaries switch from "reactors" that assimilate and remove terrestrial N to "pipes" that transport N directly to sea as degradation increases.

show abstract

“…PAEs and minerals might also adsorb the predominant PAEs, especially PAEs with shorter carbon chains (e.g., dimethyl phthalate (DMP), DEP, DIBP, DnBP) (Williams et al, 1995;Gao et al, 1998;Cao et al, 2015;He et al, 2016b).…”

Section: Sedimentpore Water Partition Coefficients Of Pahs Ocps Andmentioning

confidence: 99%

“…To our knowledge, sediment consist of both organic matter and minerals. Organic matter interacted with minerals through both hydrophilic way (electrostatic forces and/or ligand exchange reactions) and hydrophobic interactions (He et al, 2016b). PTOCs had anthropogenic origins, anyhow but also a group of organic chemicals.…”

Section: Applicability Of Various K Oc Evaluation Modelsmentioning

confidence: 99%

The partitioning behavior of persistent toxicant organic contaminants in eutrophic sediments: Coefficients and effects of fluorescent organic matter and particle size

Yang

Liu

et al. 2016

Environmental Pollution

Self Cite

View full text Add to dashboard Cite

In the shallow lakes, the partitioning of organic contaminants into the water phase from the solid phase might pose a potential hazard to both benthic and planktonic organisms, which would further damage aquatic ecosystems. This study determined the concentrations of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), and phthalate esters (PAEs) in both the sediment and the pore water from Lake Chaohu and calculated the sediment - pore water partition coefficient (K) and the organic carbon normalized sediment - pore water partition coefficient (K), and explored the effects of particle size, organic matter content, and parallel factor fluorescent organic matter (PARAFAC-FOM) on K. The results showed that log K values of PAHs (2.61-3.94) and OCPs (1.75-3.05) were significantly lower than that of PAEs (4.13-5.05) (p < 0.05). The chemicals were ranked by log K as follows: PAEs (6.05-6.94) > PAHs (4.61-5.86) > OCPs (3.62-4.97). A modified MCI model can predict K values in a range of log 1.5 at a higher frequency, especially for PAEs. The significantly positive correlation between K and the octanol - water partition coefficient (K) were observed for PAHs and OCPs. However, significant correlation was found for PAEs only when excluding PAEs with lower K. Sediments with smaller particle sizes (clay and silt) and their organic matter would affect distributions of PAHs and OCPs between the sediment and the pore water. Protein-like fluorescent organic matter (C2) was associated with the K of PAEs. Furthermore, the partitioning of PARAFAC-FOM between the sediment and the pore water could potentially affect the distribution of organic pollutants. The partitioning mechanism of PAEs between the sediment and the pore water might be different from that of PAHs and OCPs, as indicated by their associations with influencing factors and K.

show abstract

Dynamic exchanges between DOM and POM pools in coastal and inland aquatic ecosystems: A review

Cited by 170 publications

References 141 publications

The multilayer model of soil mineral–organic interfaces—a review

The multilayer model of soil mineral–organic interfaces—a review

δ¹⁵N patterns in three subtropical estuaries show switch from nitrogen “reactors” to “pipes” with increasing degradation

The partitioning behavior of persistent toxicant organic contaminants in eutrophic sediments: Coefficients and effects of fluorescent organic matter and particle size

Contact Info

Product

Resources

About

Dynamic exchanges between DOM and POM pools in coastal and inland aquatic ecosystems: A review

Cited by 170 publications

References 141 publications

The multilayer model of soil mineral–organic interfaces—a review

The multilayer model of soil mineral–organic interfaces—a review

δ15N patterns in three subtropical estuaries show switch from nitrogen “reactors” to “pipes” with increasing degradation

The partitioning behavior of persistent toxicant organic contaminants in eutrophic sediments: Coefficients and effects of fluorescent organic matter and particle size

Contact Info

Product

Resources

About

δ¹⁵N patterns in three subtropical estuaries show switch from nitrogen “reactors” to “pipes” with increasing degradation