101,975 research outputs found
Microbial formation of volatile arsenic in cattle dip site soils contaminated with arsenic and DDT
No full textB.B Edvantoro, R Naidu, M Megharaj, G Merrington, I Singleto
Merrington: land, landlord and tenants 1541 – 1840
No full textThis thesis considers the performance of the Dean and Chapter of Durham as estate managers from 1541-1840, as perceived from the detailed study of one parish. Durham was created as a New Foundation Cathedral in 1541 by Henry VIII and endowed with the lands of the Priory, which had been dissolved in 1539. Durham Chapter administered the same lands until 1840 when central government again intervened with cathedral estates. Cathedral chapters have been described as 'inactive rentier' landlords. Durham Chapter’s management is compared with that of other landlords to see if this description was justified. The Chapter's response to problems and challenges, such as tenant right and inflation in the sixteenth century, civil war and abolition in the seventeenth century and rapidly changing agricultural practices in the eighteenth and nineteenth centuries is considered. The thesis concludes that by 1626 Durham Chapter had created an effective system of estate management, known as beneficial leasehold, which offered tenants security of tenure and fixed rents, while compensating the Chapter for inflation by regular renewal fines, related to the true value of the land. The Chapter were not inactive rentiers in 1640: they promoted agricultural innovation, especially enclosure of the townships. The work of the Chapter was only interrupted by the Civil War, not fundamentally altered. The Chapter recovered relatively rapidly at the Restoration: their tenants had greater problems because of the costs of war and land purchase. By the nineteenth century, the Chapter were left behind by progressive landlords who controlled their tenants' farming practices and drew a greater financial return from their lands than Durham Chapter achieved. However, progress continued on the Chapter estate, as the security of beneficial leasehold encouraged tenants to invest, for example in restructuring their farms, breeding improved cattle and introducing new field crops and rotations
The potential of soil protein-based methods to indicate metal contamination
No full textSingleton, I.; Merrington, G.; Colvan, S.; Delahunty, J. S
Mobilisation and fixation of Zn in polluted soils by variations of pH
No full textThe concentration of Zn in soil solution (the free cation and its soluble complexes) is largely controlled by the equilibrium that it has with the quantity of metal associated with the soil solid phase (Tiller et al., 1972a). Radioisotope procedures to measure this quantity of solid phase metal, that has been termed 'readily phytoavailable', have proved invaluable in that the L value has often been shown to be statistically equivalent to the isotopically exchangeable metal in the soil - the E value (Tiller et al., 1972b). Therefore, E values provide a direct indication of the quantity of potentially phytoavailable Zn in soils (L value). However, plants have the ability to induce pH changes in the rhizosphere and, therefore, may increase (mobilisation) or decrease (fixation) the quantity of isotopically dilutable Zn in polluted soils. This hypothesis was examined in a polluted acid (pH 6.2) and calcareous soil (pH 7.5) using a batch experimental system.R.N. Collins, G. Merrington, M.J. McLaughlin, J.L. More
Cadmium sorption in biosolids amended soils: results from a field trial
No full textCopyright © 2003 Elsevier B.V. All rights reserved.The effect of biosolids amendment on cadmium sorption coefficient (K(d)) was determined for soils in a biosolids field trial. The sorptive properties of biosolids are thought to have a significant controlling effect upon the availability/uptake and mobility of potentially toxic metals. K(d) values for the three biosolids were 10-30 times greater than those for unamended soil. Elevated K(d) values were still apparent 1 and 2 years after biosolids amendment (100 t ha(-1)) for two of the three biosolids. Chemical extractants (sodium hypochlorite and hydrofluoric acid, respectively) were used in an attempt to determine K(d) values of isolated inorganic and organic fractions. For both biosolids amended soils and unamended controls, Cd sorption appeared to be dominated by the inorganic fraction, potentially indicating the overriding importance of this fraction in controlling metal mobility. However, for the biosolids themselves, the sum of inorganic and organic fraction contributions to K(d) accounted for less than half the K(d) of the whole biosolids. This discrepancy was attributed to the loss of highly sorptive water soluble species in both chemical extractions.G. Merrington and R. J. Smernikhttp://www.elsevier.com/wps/find/journaldescription.cws_home/503360/description#descriptio
Copper partitioning among mineral and organic fractions in biosolids
No full textCopyright © 2006 CSIROMetal partitioning between organic and mineral fractions in biosolids may provide an indication of the long-term risks associated with land application of the material. For example, metals found to partition into the organic phase may pose a potential threat when the organic matter is decomposed, whereas metals bound in the mineral fraction would be expected to remain stable over time (given no changes in other environmental conditions) owing to the stability of mineral components. Therefore the question of which components bind copper in biosolids, and whether the sorption capacity is maintained over time, was addressed in the present study. Biosolids incubated for 21 months and non-incubated controls were examined. The solid–solution distribution coefficient (Kd) for Cu was measured in whole biosolids and in biosolid organic and mineral fractions via batch experiments employing the radioactive isotope 64Cu. The mineral fraction was isolated by NaOCl oxidation, whereas the organic fraction was isolated using HF. Results found the relative importance of mineral and organic fractions to Cu sorption varies between biosolids, and in some cases can vary over time. Reduction in sorption capacity caused by losses of organic matter in some biosolids suggests the possibility of increased availability of biosolid metals over time.I. W. Oliver, G. Merrington and M. J. McLaughli
The loss of a child: the long term impact upon the parent-child bond
No full textResearch has been carried out from a psychological perspective, to examine the effects of bereavement in families when they have experienced the loss of a baby, child, teenager or young adult. This has involved interviewing parents in Lebanon, Tanzania and Uganda. The results were then compared to previous research carried out by the author in England (For a M.Phil. in Theology titled, ‘Bereavement in Families who have lost Babies, Children and Teenagers; An Empirical and Theological Study’. Birmingham University , 1995). Using the collective data, the theory of Shadow Grief is investigated in terms of whether it is a genuine condition within bereaved parents, as compared to other grief reactions such as chronic grief, disenfranchised grief or pathological grief.
It was found that the bond between a parent and child was a particularly deep rooted affectionate bond. There are similarities between this bond and Bowlby’s concept of attachment theory. Parents from the English sample showed some signs of maintaining a bond with the deceased many years after the loss. This was seen to a lesser extent in the African context. This requires further research to clarify this effect both in the English culture and cross-culturally, looking at a broader section of communities where child loss had taken place. Grief therapists need to be more aware of the long lasting effects that the loss of a child has upon a parent, especially those who are bereaved of older children
Sources of copper into the European aquatic environment
No full textChemical contamination from point source discharges in developed (resource-rich) countries has been widely regulated and studied for decades; however, diffuse sources are largely unregulated and widespread. In the European Union (EU), large dischargers report releases of some chemicals, yet little is known of total emissions (point and diffuse) and their relative significance. We estimated copper loadings from all significant sources including industry, sewage treatment plants, surface runoff (from traffic, architecture, and atmospheric deposition), septic tanks, agriculture, mariculture, marine transport (antifoulant leaching), and natural processes. A combination of European datasets, literature, and industry data were used to generate export coefficients. These were then multiplied by activity rates to derive loads. A total of approximately 8 kt of copper per annum (ktpa) is estimated to enter freshwaters in the EU, and another 3.5 ktpa enters transitional and coastal waters. The main inputs to freshwater are natural processes (3.7 ktpa), agriculture (1.8 ktpa), and runoff (1.8 ktpa). Agricultural emissions are dominated by copper-based plant protection products and farmyard manure. Urban runoff is influenced by copper use in architecture and by vehicle brake linings. Antifoulant leaching from boats (3.2 ktpa) dominates saline water loads of copper. It is noteworthy that most of the emissions originate in a limited number of copper uses where environmental exposure and pathways exist, compared with the bulk of copper use within electrical and electronic equipment and infrastructure that has no environmental pathway during its use. A sensitivity analysis indicated significant uncertainty in data from abandoned mines and urban runoff load estimates. This study provided for the first time a methodology and comprehensive metal load apportionment to European aquatic systems, identifying data gaps and uncertainties, which may be refined over time. Source apportionments using this methodology can inform more cost-effective environmental risk assessment and management. Integr Environ Assess Manag 2022;00:1-17. (c) 2022 The Authors. Integrated Environmental Assessment and Management published by Wiley Periodicals LLC on behalf of Society of Environmental Toxicology & Chemistry (SETAC)
The effect of aging biosolids on the availability of cadmium and zinc in soil
No full text© Blackwell Science The definitive version is available at www.blackwell-synergy.comA major concern with the safe re-use of biosolids on land is the potential for release of metals from organic matter in the biosolids, due to decomposition proceeding as biosolids age. To quantify the effects of biosolid aging on Cd and Zn bioavailability, two sewage sludges (Lagoon sludge and Filtered sludge) and a garden compost were incubated at 25°C and 35°C for 100 days. Changes in availability of Cd and Zn were determined using isotope dilution principles, with the materials being labelled with carrier-free 109Cd and 65Zn. We determined isotopically exchangeable metal pools (E values) and plant available metal pools (L values) by measuring specific activities of Cd and Zn in soil extracts and in wheat plants, respectively. Changes in carbon content over time were determined using 13C-NMR spectroscopy and chemical extraction methods, and related to changes in availability of metal pools as determined by isotopic procedures. Hot-water-extractable carbon content, assumed to represent easily decomposable organic matter, decreased during the 100 days by 80–190 mg kg−1. The Compost and Lagoon sludge showed no change in L values for Cd or Zn with time, but in the Filtered sludge the L values for Cd and Zn increased significantly, by 43% and 56%, respectively. The isotopically exchangeable pools of Cd and Zn did not change with incubation treatment of the biosolids. These data indicate that the potential for metal release from biosolids as organic matter decomposes depends to a large extent on the biosolid composition.S. Stacey, G. Merrington and M. J. McLaughli
Bibliographie Hilarion G. Petzold 1958 – 2009 mit Anhang als Einführung
No full textDieses Archiv enthält die Gesamtbibliographie der Werke des Autors nebst einiger Texte „Über H. G. Petzold“ im Schlussteil der Bibliographie sowie einen Anhang mit einer Einführung in die Architektur des Werkes in seinem wissenslogischen Aufbau als Ausarbeitung seines „Tree of Science Modells“ (2007).This archive contains the complete bibliography of the author and some texts about H. G. Petzold, moreover an epilogue with an introduction to the architecture of the works in its epistemological structure and composition and as an elaborations of Petzold’s „Tree of Science Modell (2007).https://www.fpi-publikation.de/polyloge/01-2009-petzold-h-g-gesamtbibliographie-h-g-petzold-1958-2009-updating-november2009/peerReviewedpublishedVersio
- …
