Sources and Environmental Fate of Strongly Complexed Nickel in Estuarine Waters:  The Role of Ethylenediaminetetraacetate

1999 ◽  
Vol 33 (6) ◽  
pp. 926-931 ◽  
Author(s):  
William W. Bedsworth ◽  
David L. Sedlak
Keyword(s):  
Environmental Fate ◽  
Estuarine Waters

scholarly journals Surface Charge governs the adsorption behaviour of glyphosate in Australian Oxisol Soil System

2021 ◽  
Author(s):  
Aman D. Sharma
Keyword(s):  
Surface Charge ◽  
Environmental Fate ◽  
Adsorption Behaviour ◽  
Soil System ◽  
Potentiometric Titrations ◽  
Batch Sorption ◽  
Soil Systems ◽  
The University ◽  
Sydney Australia

Abstract Glyphosate adsorption pattern is important for determining its environmental fate. Oxisol soil systems adsorb maximum glyphosate in the presence of biochar, however, the mechanism was not known. This article provides information concerning the role of surface charge in the case of Oxisol soil systems. Batch sorption experiments were conducted at the University of Sydney, Australia. Potentiometric titrations were done to calculate the surface charge in the case of Oxisol soil systems. Maximum adsorption of glyphosate in the Oxisol soil systems in the presence of char was due to an increase in net positive surface charge. This finding is of great importance to understanding the mechanism of herbicide soil interactions.

scholarly journals Surface Charge governs the adsorption behaviour of glyphosate in Australian Oxisol Soil System

2021 ◽  
Author(s):  
Aman D. Sharma
Keyword(s):  
Surface Charge ◽  
Environmental Fate ◽  
Adsorption Behaviour ◽  
Soil System ◽  
Potentiometric Titrations ◽  
Batch Sorption ◽  
Soil Systems ◽  
The University ◽  
Sydney Australia

Abstract Glyphosate adsorption pattern is important for determining its environmental fate. Oxisol soil systems adsorb maximum glyphosate in the presence of biochar, however, the mechanism was not known. This article provides information concerning the role of surface charge in the case of Oxisol soil systems. Batch sorption experiments were conducted at the University of Sydney, Australia. Potentiometric titrations were done to calculate the surface charge in the case of Oxisol soil systems. Maximum adsorption of glyphosate in the Oxisol soil systems in the presence of char was due to an increase in net positive surface charge. This finding is of great importance to understanding the mechanism of herbicide soil interactions.

Studies in Australian Estuarine Hydrology. I. Introdutory and Comparative Features

1951 ◽  
Vol 2 (2) ◽  
pp. 1 ◽  
Author(s):  
DJ Rochford
Keyword(s):  
Chemical Interaction ◽  
Chemical Properties ◽  
Zonal Distribution ◽  
Estuarine Waters ◽  
Bottom Deposits ◽  
Diurnal Range ◽  
Mud Flat ◽  
Estuarine Systems ◽  
General Aspects

In this paper is presented an introduction to the methods involved in the collection, analysis, and interpretation of Australian estuarine hydrological data collected by the Division of Fisheries, C.S.I.R.O. The chief features of the circulation and mixing exchanges in such systems have been discussed. A review of the zonal distribution of the principal hydrological properties of estuarine waters, and of certain selected chemical properties of the bottom deposits, has led to the establishment of a schematic zonal diagram by which the hydrological classification of estuarine systems can be attempted. An examination of the zonal composition of certain estuarine systems has been attempted, and on the basis of such composition and the volume of water, a theory of zonal dominance has been developed. The development of conflicts of hydrological properties, by reason of tidal rise and fall of water level, has been examined, and some idea of the range of this derived property demonstrated by an examination of the diurnal range of chlorinity in certain estuarine systems. Some general aspects of the productivity of estuarine waters and bottom deposits have been examined and a number of hypotheses concerning the role of phosphates in their respective productivity levels have been postulated. An examination of the chemical interaction between the water and its associated bottom deposit has been made. The relation of these studies to oyster cultivation and methods of mud flat enrichment for promotion of oyster growth has been discussed.

Distribution of tritium in estuarine waters: the role of organic matter

2009 ◽  
Vol 100 (10) ◽  
pp. 890-895 ◽  
Author(s):  
Andrew Turner ◽  
Geoffrey E. Millward ◽  
Martin Stemp
Keyword(s):  
Organic Matter ◽  
Estuarine Waters

The effect of irradiance and temperature on the role of photolysis in the removal of organic micropollutants under Antarctic conditions

2013 ◽  
Vol 10 (5) ◽  
pp. 417 ◽  
Author(s):  
Philipp Emnet ◽  
Rai S. Kookana ◽  
Ali Shareef ◽  
Sally Gaw ◽  
Mike Williams ◽  
...  
Keyword(s):  
Environmental Fate ◽  
Limit Of Detection ◽  
Ice Cover ◽  
Degradation Pathway ◽  
Organic Micropollutants ◽  
Abstract Knowledge ◽  
Photolytic Degradation ◽  
Untreated Sewage ◽  
The Antarctic

Environmental context Antarctica has several scientific research stations located along its coast, where they discharge often untreated sewage containing organic micropollutants. Although degradation of these pollutants by microorganisms is limited by the cold conditions, other pathways such as photodegradation may be significant. Our results indicate that, during the summer, photolysis is a potentially significant degradation pathway for organic micropollutants in Antarctic surface waters, although the rate of loss would depend on ice cover and water depth. Abstract Knowledge of the environmental fate of organic micropollutants in Antarctica is limited, especially with respect to photolysis. The Antarctic is characterised by extreme light conditions of either continuous sunshine or darkness depending on the season. The photolytic degradation of benzophenone-3 (BP-3), bisphenol A (BPA), 17α-ethinylestradiol (EE2), methyl paraben (mParaben), 4-t-octylphenol (4-t-OP) and triclosan in MilliQ and seawater was investigated over a range of irradiance levels and temperatures. Photodegradation was compound specific. Up to 20% of BPA, BP-3 and EE2 was degraded over a 7-h irradiance period. Triclosan and 4-t-OP degraded to below the limit of detection in all experiments whereas mParaben was not degraded. The degradation of triclosan increased with irradiance in both MilliQ (P=2.2×10–16) and seawater (P=2.2×10–16). The degradation of 4-t-OP increased with irradiance in MilliQ (P=8.5×10–9) and seawater (P=1.1×10–5), and with temperature in MilliQ (P=8.5×10–9) and seawater (P=1.0×10–5). Similar relationships could not be established for BPA, BP-3, EE2 and mParaben due to the limited extent of degradation observed. The photolysis of triclosan was enhanced 4-fold in seawater compared to MilliQ water. Results from this study indicate that micropollutants may persist for extended periods of time in Antarctic coastal waters, particularly with ice cover, above and beyond that exhibited in temperate seawater.

Environmental fate of ceftiofur sodium, a cephalosporin antibiotic. Role of animal excreta in its decomposition

1990 ◽  
Vol 38 (3) ◽  
pp. 890-894 ◽  
Author(s):  
Terry J. Gilbertson ◽  
Rex E. Hornish ◽  
Prem S. Jaglan ◽  
K. Thomas Koshy ◽  
John L. Nappier ◽  
...  
Keyword(s):  
Environmental Fate ◽  
Animal Excreta ◽  
Cephalosporin Antibiotic ◽  
Ceftiofur Sodium

The role of biochar in modifying the environmental fate, bioavailability, and efficacy of pesticides in soils: a review

Soil Research ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 627 ◽  
Author(s):  
Rai S. Kookana
Keyword(s):  
Black Carbon ◽  
Organic Contaminants ◽  
Environmental Fate ◽  
Pyrolytic Carbon ◽  
High Specific Surface Area ◽  
Carbon Accounting ◽  
Published Research ◽  
Biochar Amendment ◽  
Emission Of Greenhouse Gases

The role of biochar in sequestration of carbon, reducing the emission of greenhouse gases, and improving the soil fertility is increasingly being recognised and is leading to the recommendations of biochar amendment of soils. However, the implications of such amendments to the environmental fate and efficacy of pesticides are not well understood. The published work on the role of black carbon (which includes charcoal, soot, and other pyrolytic carbon materials) in the environmental fate and effect of organic contaminants is reviewed here, together with the studies on bioavailability and efficacy of some herbicides in soils amended with freshly produced biochars. Biochars, due to their unique properties especially their highly carbonaceous and aromatic nature and high specific surface area, have been reported to be up to >2000 times more effective than soil in sorbing pesticides. The incorporation of relatively small amounts of fresh biochars in soil (0.05% by wt) has also been shown to inhibit the microbial degradation of organic compounds including pesticides as well as reduce their plant availability and efficacy. Based on limited published research on biochars and related research on black carbon reviewed here, biochar amendments to soils are likely to reduce the bioavailability and efficacy of pesticides. Furthermore, these amendments can influence the potential accumulation and ecotoxicological impact of pesticides and other organic contaminants in the soil environment. The implications of heterogeneity and ageing of biochars applied to soils for sorption and desorption processes and in turn for other environmental fate processes need to be understood to seek the appropriate balance between carbon sequestration and pesticide efficacy. While biochar amendment of soil holds appeal from a carbon accounting and soil conditioning perspective, further research is urgently required to determine how biochar influences the efficacy and environmental fate of agrochemicals such as pesticides.

Radio-Labelled Humic Materials in Migration Studies

1992 ◽  
Vol 294 ◽  
Author(s):  
Lars Carlsen ◽  
Pia Lassen ◽  
Peter Warwick ◽  
Amanda Randall
Keyword(s):  
Environmental Fate ◽  
Fulvic Acids ◽  
Migration Studies ◽  
Humic And Fulvic Acids ◽  
Humic Material ◽  
Naturally Occurring ◽  
Significant Strength ◽  
Soils And Sediments ◽  
Humic Materials

ABSTRACTHumic- and fulvic acids are able to complex polyvalent metal ions, e.g. radionuclides, leading to soluble complexes of significant strength, thereby decreasing the sorption of these compounds to soils and sediments. The interaction of humic materials with radionuclides may significantly influence the availability and transport of the latter in the environment. Typically, studies along these lines have focussed almost exclusively on the radionuclides, whereas the actual role of the humic material has been elucidated only indirectly. In order directly to study the behaviour of the naturally occurring organic macro-molecules in relation to the environmental fate of radionuclides, radio-labelled humic- and fulvic acids can advantageously be applied. Radio-labels such as 14C and 125I have successfully been covalently incorporated in humic- and fulvic acids. Labelling of humic substances as well as preliminary migration studies are discussed

Role of the Coastal and Upper Estuarine Waters Contributing Phytoplankton to the Shoals of the Niantic Estuary

Ecology ◽  
1965 ◽  
Vol 46 (5) ◽  
pp. 665-673 ◽  
Author(s):  
Nelson Marshall ◽  
Bernice M. Wheeler
Keyword(s):  
Estuarine Waters
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