The principles of humic substances: An introduction to the first principle

Ghabbour, Elham A.; Davies, Geoffrey; MacCarthy, Patrick

doi:10.1039/9781847551085-00019

Cited by 27 publications

(18 citation statements)

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“…Previously such measurements have concentrated on using simple proxies for organic foulants with simpler chemistries, for instance, use of carboxylated latex probes [35] and unmodified silica microspheres [36]. However the chemistry of HA and other natural organic matter is complicated with a variety of functional groups present, spread across a large number of different compounds, which are nonetheless difficult to separate [16]. The approach developed here allows force measurements to be made which much better reflect interactions between HA foulants and membrane surfaces, than using a simplified approach.…”

Section: Discussionmentioning

confidence: 99%

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Adhesion forces between humic acid functionalized colloidal probes and polymer membranes to assess fouling potential

Johnson

Galiano

Deowan

et al. 2015

Journal of Membrane Science

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Section: Discussionmentioning

confidence: 99%

“…Humic acid (HA) is a heterogeneous collection of chemical species which are a major component of natural organic matter in soil and river water, formed through the natural decay of biological matter, particularly plant matter [16]. It is also a major foulant of filtration membranes [17].…”

Section: Introductionmentioning

confidence: 99%

Adhesion forces between humic acid functionalized colloidal probes and polymer membranes to assess fouling potential

Johnson

Galiano

Deowan

et al. 2015

Journal of Membrane Science

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“…Certain investigators have concluded that humic substances cannot be characterized at the molecular level (7). However, recent findings that show small primary structures compose the majority of DOM raise molecular characterization to a tractable problem.…”

Section: Defining Organic Mattermentioning

confidence: 99%

Peer Reviewed: Characterizing Aquatic Dissolved Organic Matter

Leenheer¹,

Croué²

2003

Environ. Sci. Technol.

1,141

575

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“…Humic acids are a principal component of humic substances, and are often targeted for 14 C dating (McGeehin et al, 2001). Especially common in soils, humic acids differ from charcoal and plant macrofossils in that they are composed of complex, amorphous mixtures of heterogenous molecules that do not have a common molecular structure (MacCarthy, 2001). If humic acids remain in situ following plant decay, a process referred to as "self-humification," then they may yield reliable 14 C ages (Cohen-Ofri et al, 2006).…”

mentioning

confidence: 99%

Radiocarbon dating late Quaternary loess deposits using small terrestrial gastropod shells

Pigati

McGeehin

Muhs

et al. 2013

Quaternary Science Reviews

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a b s t r a c tConstraining the ages and mass accumulation rates of late Quaternary loess deposits is often difficult because of the paucity of organic material typically available for 14 C dating and the inherent limitations of luminescence techniques. Radiocarbon dating of small terrestrial gastropod shells may provide an alternative to these methods as fossil shells are common in loess and contain w12% carbon by weight. Terrestrial gastropod assemblages in loess have been used extensively to reconstruct past environmental conditions but have been largely ignored for dating purposes. Here, we present the results of a multifaceted approach to understanding the potential for using small terrestrial gastropod shells to date loess deposits in North America. First, we compare highly resolved 14 C ages of well-preserved wood and gastropod shells (Succineidae) recovered from a Holocene loess section in Alaska. Radiocarbon ages derived from the shells are nearly identical to wood and plant macrofossil ages throughout the section, which suggests that the shells behaved as closed systems with respect to carbon for at least the last 10 ka (thousands of calibrated 14 C years before present). Second, we apply 14 C dating of gastropod shells to late Pleistocene loess deposits in the Great Plains using stratigraphy and independent chronologies for comparison. The new shell ages require less interpretation than humic acid radiocarbon ages that are commonly used in loess studies, provide additional stratigraphic coverage to previous dating efforts, and are in correct stratigraphic order more often than their luminescence counterparts. Third, we show that Succineidae shells recovered from historic loess in the Matanuska River Valley, Alaska captured the 20th century 14 C bomb spike, which suggests that the shells can be used to date late Holocene and historicaged loess. Finally, results from Nebraska and western Iowa suggest that, similar to other materials, shell ages approaching w40 ka should be viewed with caution as they may reflect trace amounts of contamination. In sum, our results show that small terrestrial gastropod shells, especially from the Succineidae family, provide reliable ages for late Quaternary loess deposits in North America. Published by Elsevier Ltd.

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The principles of humic substances: An introduction to the first principle

Cited by 27 publications

References 0 publications

Adhesion forces between humic acid functionalized colloidal probes and polymer membranes to assess fouling potential

Adhesion forces between humic acid functionalized colloidal probes and polymer membranes to assess fouling potential

Peer Reviewed: Characterizing Aquatic Dissolved Organic Matter

Radiocarbon dating late Quaternary loess deposits using small terrestrial gastropod shells

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