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Environmental problems - Chemical approaches
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Environmental Chemistry

Environmental Chemistry

Volume 14 Number 1 2017

EN16070Heteroagglomeration of nanosilver with colloidal SiO2 and clay

Sébastien Maillette, Caroline Peyrot, Tapas Purkait, Muhammad Iqbal, Jonathan G. C. Veinot and Kevin J. Wilkinson
pp. 1-8

Environmental context. The fate of nanomaterials in the environment is related to their colloidal stability. Although numerous studies have examined their homoagglomeration, their low concentration and the presence of high concentrations of natural particles implies that heteroagglomeration rather than homoagglomeration is likely to occur under natural conditions. In this paper, two state-of-the art analytical techniques were used to identify the conditions under which nanosilver was most likely to form heteroagglomerates in natural waters.

EN16049Carbon and nitrogen dynamics in decaying wood: paleoenvironmental implications

Romain Tramoy, Mathieu Sebilo, Thanh Thuy Nguyen Tu and Johann Schnyder
pp. 9-18

Environmental context. Carbon and nitrogen isotopes in terrestrial organic matter are widely used for reconstructing past environments, but organic matter is exposed to degradation as soon as it is deposited during what is called early diagenesis. This study explores the effects of this process on organic carbon and nitrogen isotopes, and concludes that it homogenises an environmental signal by integrating all their components. Thus, early diagenesis may not preclude paleoenvironmental reconstructions.

Environmental context. Nitrous acid (HONO) has long been recognized as an important atmospheric pollutant, with the reaction of HOSO + NO2 being a source of HONO. We explore the effects of an additional water or ammonia molecule on this reaction. Calculations show that the ammonia molecule has a more effective role than the water molecule in assisting the reaction.

EN16039PEST-ORCHESTRA, a tool for optimising advanced ion-binding model parameters: derivation of NICA-Donnan model parameters for humic substances reactivity

Noémie Janot, José Paulo Pinheiro, Wander Gustavo Botero, Johannes C. L. Meeussen and Jan E. Groenenberg
pp. 31-38

Environmental context. The environmental behaviour of trace metals in soils and waters largely depends on the chemical form (speciation) of the metals. Speciation software programs combining models for the binding of metals to soil and sediment constituents are powerful tools in environmental risk assessment. This paper describes a new combination of speciation software with a fitting program to optimise geochemical model parameters that describes proton and metal binding to humic substances.

EN16112Vermiculite as efficient sorbent of CeIII and CeIV

Zdeněk Klika, Jana Seidlerová, Ivan Kolomazník and Marianna Hundáková
pp. 39-47

Environmental context. Cerium, a Technology Critical Element with many technical, agricultural, and medicinal applications, is increasingly being discharged to the environment. One of the best ways to remove cerium from wastes is its fixation into inexpensive bulk material such as vermiculite. This paper investigates the mechanism of CeIII and CeIV uptake and capture by vermiculite in neutral and acidic aqueous solutions.

Environmental context. Eutrophication caused by excessive inputs of phosphorus is a prevalent global environmental problem. Reactive phosphorus released from sediments was measured by two new in situ passive sampling techniques capable of high-resolution measurements of phosphorus concentration. The methods provide the scientific evidence for solving the problems associated with deteriorating surface water quality.

Environmental context. Terrestrial environments receiving trace metal contaminants are often impacted by more than one metal. This study demonstrates the adaptation of an ion-exchange technique to simultaneously obtain Cu2+, Ni2+ and Zn2+ activities in soil extracts. These measurements can be used to better understand and predict the behaviour and bioavailability of soil metals in metal–mixture contamination scenarios.

EN16038Insights into natural organic matter and pesticide characterisation and distribution in the Rhone River

Danielle L. Slomberg, Patrick Ollivier, Olivier Radakovitch, Nicole Baran, Nicole Sani-Kast, Auguste Bruchet, Martin Scheringer and Jérôme Labille
pp. 64-73

Environmental context. Natural organic matter in surface waters is a transport vector for environmental pollutants with both its concentration and composition influencing pollutant fate. Characterisation of organic matter in surface waters, crucial to understanding pollutant transport, should also account for spatial variation along the water source. The present work characterises the natural organic matter in the Rhone River and describes the distributions of various pesticides and metabolites along the river.

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