Influence of natural organic matter on the morphology of corroding copper surface

Natural organic matter (NOM) is a ubiquitous and important component of natural waters. Polymeric species related to humus found in soils constitute the major part of NOM. NOM is of major importance for the speciation of metals in waters but its effects on metal corrosion are little known. The influence of NOM on the morphology of corroding copper surfaces is discussed in this communication. The studies were performed for copper coupons exposed for 7 weeks to waters supporting an intense localized corrosion attack called pitting. Two types of waters were used: highly mineralized water at pH close to 7.3 (water A) and soft water at pH close to 9.3 (water B). The morphology of the surface was examined using conventional photography and SEM (JEOL 5200). The range of accelerating voltages was from 10 to 25 kV.Profound effects of NOM on the state of the corroding copper surface were found.

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Tailoring activated carbons for enhanced removal of natural organic matter from natural waters

Carbon ◽

10.1016/j.carbon.2003.12.062 ◽

2004 ◽

Vol 42 (3) ◽

pp. 547-557 ◽

Cited By ~ 140

Author(s):

Seyed A Dastgheib ◽

Tanju Karanfil ◽

Wei Cheng

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Natural Waters ◽

Activated Carbons

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Adsorptive fouling of a polypropylene microfiltration membrane with dissolved natural organic matter: do membranes possess an adsorption capacity?

Water Science & Technology Water Supply ◽

10.2166/ws.2006.044 ◽

2006 ◽

Vol 6 (2) ◽

pp. 25-30 ◽

Cited By ~ 1

Author(s):

M. Koh ◽

M.M. Clark ◽

K.P. Ishida

Keyword(s):

Organic Matter ◽

Adsorption Capacity ◽

Natural Organic Matter ◽

Membrane Fouling ◽

Natural Waters ◽

Uv Light ◽

Attenuated Total Reflectance ◽

Infrared Spectrometry ◽

Flux Decline ◽

Aromatic Ether

Rejection by membrane adsorption has been observed and widely reported. However, little is known about whether membranes possess an adsorption capacity. Experimental data showed that when a hydrophobic polypropylene (PP) microfilter was used to filter a large volume of particle-free surface water containing dissolved natural organic matter (NOM), later batches of microfiltration (MF) permeate caused more flux decline to a fresh 20K-Dalton polyethersulfone (PES) ultrafilter. This suggests that membranes can have an adsorption capacity for foulants. In this research, the gradual increase in absorbance of ultraviolet (UV) light by subsequent batches of MF permeate was observed, and supports the findings from previous studies, that only a small fraction of NOM causes membrane fouling. Attenuated total reflectance Fourier transform infrared spectrometry and energy dispersive spectroscopy of fouled PP and PES membranes suggests foulants containing amide, aromatic, ether, hydroxyl and silicate functional groups. Silicates appear to participate in membrane fouling, and its removal with the small fraction of fouling NOM can reduce the fouling potential of water. These data improve our understanding of membrane fouling by natural waters, and have implications for the design of membrane plants that filter natural waters.

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Biofilm control in water by advanced oxidation process (AOP) pre-treatment: effect of natural organic matter (NOM)

Water Science & Technology ◽

10.2166/wst.2011.077 ◽

2011 ◽

Vol 64 (9) ◽

pp. 1876-1884 ◽

Cited By ~ 12

Author(s):

Anat Lakretz ◽

Eliora Z. Ron ◽

Tali Harif ◽

Hadas Mamane

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Biofilm Formation ◽

Natural Waters ◽

Advanced Oxidation Process ◽

Oxidation Process ◽

Advanced Oxidation ◽

Post Treatment ◽

Control Effect ◽

Biofilm Control

The main goal of this study was to examine the influence of natural organic matter (NOM) on the efficiency of H2O2/UV advanced oxidation process (AOP) as a preventive treatment for biofilm control. Pseudomonas aeruginosa PAO1 biofilm-forming bacteria were suspended in water and exposed to various AOP conditions with different NOM concentrations, and compared to natural waters. H2O2/UV prevented biofilm formation: (a) up to 24 h post treatment – when residual H2O2 was neutralized; (b) completely (days) – when residual H2O2 was maintained. At high NOM concentrations (i.e. 25 mg/L NOM or 12.5 mg/L DOC) an additive biofilm control effect was observed for the combined H2O2/UV system compared to UV irradiation alone, after short biofilm incubation times (<24 h). This effect was H2O2 concentration dependent and can be explained by the high organic content of these water samples, whereby an increase in NOM could enhance •OH production and promote the formation of additional reactive oxygen species. In addition, maintaining an appropriate ratio of bacterial surviving conc.: residual H2O2conc. post-treatment could prevent bacterial regrowth and biofilm formation.

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Speciation of trace metals in natural waters: The influence of an adsorbed layer of natural organic matter (NOM) on voltammetric behaviour of copper

Analytica Chimica Acta ◽

10.1016/j.aca.2007.11.011 ◽

2008 ◽

Vol 606 (1) ◽

pp. 37-44 ◽

Cited By ~ 27

Author(s):

Yoann Louis ◽

Petra Cmuk ◽

Dario Omanović ◽

Cédric Garnier ◽

Véronique Lenoble ◽

...

Keyword(s):

Organic Matter ◽

Trace Metals ◽

Natural Organic Matter ◽

Natural Waters ◽

Adsorbed Layer

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Does natural organic matter increase the bioavailability of cerium dioxide nanoparticles to fish?

Environmental Chemistry ◽

10.1071/en15003 ◽

2015 ◽

Vol 12 (6) ◽

pp. 673 ◽

Cited By ~ 3

Author(s):

Rhys M. Goodhead ◽

Blair D. Johnston ◽

Paula A. Cole ◽

Mohammed Baalousha ◽

David Hodgson ◽

...

Keyword(s):

Organic Matter ◽

Natural Organic Matter ◽

Cerium Dioxide ◽

Natural Waters ◽

Biological Effects ◽

Fulvic Acids ◽

Consumer Products ◽

Ceo2 Nanoparticles ◽

Aggregation Behaviour ◽

Analytical Approaches

Environmental context Nanoparticles are present in growing volumes of consumer products and are suspected to be released into the environment at detectable levels. We focus on cerium dioxide nanoparticles and investigate their availability to fish from the water column, where we found increasing concentrations of natural organic material increased the ceria measured in the fish gills. This complex interaction between nanoparticle behaviour and uptake from environmentally relevant test systems is significantly understudied. Abstract Natural organic colloids affect the fate and behaviour of nanoparticles in the aquatic environment but how these interactions affect the bioavailability of nanoparticles to organisms is a major knowledge gap in risk-assessment analysis. Here, we investigated interactions of citrate-coated cerium dioxide (CeO2) nanoparticles with fulvic acids, representing natural organic matter, and assessed their bioavailability to fish (common carp, Cyprinus carpio) exposed chronically (32days) via the water. We show a fulvic acid concentration-related enhancement in the uptake of cerium (Ce) into gill tissues, with some evidence for an enhanced Ce uptake also into kidney and brain tissues in the presence of fulvic acids, but with more variable responses. We present evidence for differences in the aggregation behaviour for CeO2 nanoparticles in the different exposure scenarios, with reduced CeO2 particle aggregate size with citrate coating and fulvic acids, as determined from dynamic light scattering. We highlight that multiple analytical approaches are essential for understanding the dynamic nature of the particles and also that interpretations on measured particle sizes and characteristics may differ depending on the technique(s) employed. We conclude that conditions in natural waters are likely to play a fundamental role in affecting bioavailability and thus potential biological effects of CeO2 particles.

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Microbial Life on the Surface of Microplastics in Natural Waters

Applied Sciences ◽

10.3390/app112411692 ◽

2021 ◽

Vol 11 (24) ◽

pp. 11692

Author(s):

Olena Stabnikova ◽

Viktor Stabnikov ◽

Andriy Marinin ◽

Maris Klavins ◽

Linards Klavins ◽

...

Keyword(s):

Public Health ◽

Organic Matter ◽

Natural Organic Matter ◽

Pathogenic Bacteria ◽

Natural Waters ◽

Aquatic Environments ◽

Microbial Life ◽

Air Interface ◽

Key Topics ◽

Negative Impacts

Major water-polluting microplastics (for example, polyethylene, polypropylene and others) have lower density than water. Therefore, they are concentrated in the neustonic layer near the water-air interface altogether with dissolved or colloidal natural organic matter, hydrophobic cells and spores of bacteria. This can cause environmental and public health problems because the floating micro- and nanoparticles of plastics could be coated with biofilm of hydrophobic and often putative pathogenic bacteria. Biofilm-coated microplastics are more attractive for consumption by aquatic animals than pure microplastics, and that increases the negative impacts of microplastics. So, impacts of even small quantities of microplastics in aquatic environments must be accounted for considering their accumulation in the micro-layer of water-air interphase and its interaction with bacterioneuston. Microorganisms attached to the surface of microplastic particles could interact with them, use them as substrates for growth, to change properties and biodegrade. The study of microbial life on the surface of microplastic particles is one of the key topics to understanding their role in the environment.

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Atomic Scale Insight into Corrosion Inhibition: DFT Study of 2-Mercaptobenzimidazole on Locally De-Passivated Copper Surfaces

Journal of The Electrochemical Society ◽

10.1149/1945-7111/ac405c ◽

2021 ◽

Author(s):

Fatah Chiter ◽

Dominique Costa ◽

Vincent Maurice ◽

Philippe Marcus

Keyword(s):

Metal Surface ◽

Barrier Properties ◽

Copper Surface ◽

Atomic Scale ◽

Localized Corrosion ◽

Oxide Surface ◽

Organic Film ◽

Copper Surfaces ◽

Significant Difference ◽

Key Factor

Abstract A key factor for effective inhibition by organic molecules of the initiation of localized corrosion by pitting is their ability to form a protective organic film in locally de-passivated zones exposing the bare metal next to the oxide-covered surface. Herein, based on quantum chemical DFT calculations, we study the chemistry of the interface between 2-mercaptobenzimidazole (MBI) and a copper surface partially covered by a Cu2O passive oxide film. The results show the adaptability of the molecule to adsorb strongly on the different zones, oxide or metal, of a locally de-passivated surface. However, differences in the local adsorption configurations, involving covalent bonding with H-bonding depending on oxide or metal and on conformer, thione or thiolate, lead to the formation of an inhomogeneous organic film. Increasing order of local adsorption strength is oxide walls < metal surface < oxide surface < oxide edges for the thione species, whereas there is no significant difference of local adsorption strength for the thiolate species. Our results suggest that both species of MBI can heal the oxygen and copper low coordinated sites as well as can protect the exposed metal surface, thus enhancing the barrier properties of the passivated surface even when locally defective.

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Formation of Haloforms during Chlorination of Natural Waters

Acta Polytechnica ◽

10.14311/334 ◽

2002 ◽

Vol 42 (2) ◽

Cited By ~ 1

Author(s):

A. Grünwald ◽

B. Šťastný ◽

K. Slavíčková ◽

M. Slavíček

Keyword(s):

Drinking Water ◽

Organic Matter ◽

Human Health ◽

Natural Organic Matter ◽

Water Samples ◽

Natural Waters ◽

Humic Compounds ◽

Mutagenic Effects ◽

By Products

Recent drinking water regulations have lowered the standards for disinfection by-products and have added new disinfection by-products for regulation. Natural organic matter (NOM), mainly humic compounds, plays a major role in the formation of undesirable organic by-products following disinfection of drinking water. Many disinfection by-products have adverse carcinogenic or mutagenic effects on human health. This paper deals with the formation potencial of disinfection by-products in water samples taken from different places in the Flaje catchment.

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Impact of natural organic matter characteristics and inorganic anions on the performance of ion exchange resins in natural waters

Water Science & Technology Water Supply ◽

10.2166/ws.2020.197 ◽

2020 ◽

Vol 20 (8) ◽

pp. 3107-3119

Author(s):

Fuhar Dixit ◽

Benoit Barbeau ◽

Madjid Mohseni

Keyword(s):

Molecular Weight ◽

Organic Matter ◽

Ion Exchange ◽

Natural Organic Matter ◽

Natural Waters ◽

Site Occupancy ◽

Inorganic Ions ◽

Inorganic Anions ◽

Simultaneous Removal ◽

Cost Effective Treatment

Abstract Ion exchange (IX) process is increasingly used as a cost-effective treatment for the removal of natural organic matter (NOM) from drinking water. However, fundamental studies under the influence of variable NOM characteristics and inorganic anions have often been overlooked. This is important given NOM characteristics (such as charge density and molecular weight) and inorganic anions concentrations are geographically and seasonally variable. We examined the performance of a strongly basic IX resin for the simultaneous removal of NOM, inorganic ions and micropollutants (Per- and polyfluoroalkyl substances (PFAS) and algal toxins), from different surface and recycled waters. The results indicated >70% removal of NOM for ∼20,000 Bed Volumes (BV) with an uptake of NOM fractions following the order of their respective charge densities. IX pore blockage and consequent site reduction was observed in the presence of higher molecular weight NOM fractions (breakthrough ∼7,000 BV). Moreover, NOM and inorganic ions breakthrough corresponded to ∼85–90% site occupancy (in meq) in the absence of pore blocking compounds. IX also provided simultaneous removal of inorganic ions (>90%) and charged micropollutants. Complete removals of Microcystin-LR and multiple long- and short-chained PFAS were achieved at environmentally relevant concentrations with dosages of 1,000 mg/L (or 4.5 mL/L) or higher.

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Recent advances in structure and reactivity of dissolved organic matter: radiation chemistry of non-isolated natural organic matter and selected model compounds

Water Science & Technology ◽

10.2166/wst.2012.404 ◽

2012 ◽

Vol 66 (9) ◽

pp. 1941-1949 ◽

Cited By ~ 7

Author(s):

Shakiba Ayatollahi ◽

Daina Kalnina ◽

Weihua Song ◽

Barbara A. Cottrell ◽

Michael Gonsior ◽

...

Keyword(s):

Organic Matter ◽

Phenolic Compounds ◽

Natural Organic Matter ◽

Natural Waters ◽

Environmental Fate ◽

Radiation Chemistry ◽

Complex Compounds ◽

Model Compounds ◽

Transient Spectra ◽

Oxidation Chemistry

The importance of natural organic matter (NOM) as a source of carbon in natural waters, as the source of reactive oxygen species, or for the complications its presence causes in treatment of natural waters, is undeniable. Recent studies have also pointed to the major photochemical role of triplet excited state of natural organic matter in the environmental fate of pharmaceutical and personal care products (PPCPs) in waters. However, the characterization of NOM is problematic due to its complex molecular structure. One approach to better understand NOM chemistry is the use of model compounds. As the condensation of a plant's phenolic compounds leads to humification and the formation of NOM, a structurally broad group of nine phenolic compounds were selected as model compounds for this study. With methods used in the discipline of radiation chemistry, the oxidative chemistry and transient spectra of these phenols were studied. In addition, the oxidative chemistry and transient spectra of a sample of NOM from the Black River, North Carolina, USA, was characterized. This natural water sample was used as received and represents the first studies of non-isolated NOM by pulsed radiolysis. The results of the transient spectra of the NOM revealed that the radical intermediates were very long lived. This phenomenon was not captured using the nine model compounds suggesting that more complex compounds are needed to further our understanding of the oxidation chemistry of NOM.

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