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1.
  • Artigas, J., et al. (författare)
  • Towards a renewed research agenda in ecotoxicology
  • 2012
  • Ingår i: Environmental Pollution. - : Elsevier BV. - 0269-7491. ; 160, s. 201-206
  • Tidskriftsartikel (refereegranskat)abstract
    • New concerns about biodiversity, ecosystem services and human health triggered several new regulations increasing the need for sound ecotoxicological risk assessment. The PEER network aims to share its view on the research issues that this challenges. PEER scientists call for an improved biologically relevant exposure assessment. They promote comprehensive effect assessment at several biological levels. Biological traits should be used for Environmental risk assessment (ERA) as promising tools to better understand relationships between structure and functioning of ecosystems. The use of modern high throughput methods could also enhance the amount of data for a better risk assessment. Improved models coping with multiple stressors or biological levels are necessary to answer for a more scientifically based risk assessment. Those methods must be embedded within life cycle analysis or economical models for efficient regulations. Joint research programmes involving humanities with ecological sciences should be developed for a sound risk management. (C) 2011 Elsevier Ltd. All rights reserved.
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3.
  • Köhler, S, et al. (författare)
  • Evaluation of different approaches to quantify strong organic acidity and acid-base buffering of organic-rich surface waters in Sweden
  • 2002
  • Ingår i: Water Research, Volume. ; 36:18, s. 4487-96
  • Tidskriftsartikel (refereegranskat)abstract
    • The role of organic acids in buffering pH in surface waters has been studied using a small brownwater stream (26mgL-1 TOC) draining a forested catchment in Northern Sweden. Under the conditions of elevated pressure of CO2 stream field pH was changed between 3.5 and 6.1 during the acidification and alkalinization experiment. Acid-base characteristics of the natural organic matter were also determined using a high precision potentiometric method for a concentrated sample from the same stream. We compared the predictions from the Windermere Humic Aqueous Model (WHAM Model V), a model derived from the potentiometric titration (diprotic/monoprotic acid model) and a previously derived triprotic acid model which only uses alkalinity and TOC as input variables. The predicted buffering characteristics of all three models are very similar in the pH range 4.5-7 which suggests that during routine analysis alkalinity and TOC are sufficient to give a good estimate of organic acid anion charge contribution in a large range of surface waters. A slightly adjusted version of WHAM V successfully describes the organic charge contribution in a large number of sampled surface water lakes, which were previously used to calibrate the triprotic model.
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