Essays about: "TOC"

Showing result 21 - 25 of 97 essays containing the word TOC.

1. 21. Influence of land cover changes on organic carbon and organic nitrogen concentrations in Swedish rivers

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Julia Iwan; [2021]
   Keywords : Total Organic Carbon TOC ; Total Organic Nitrogen TON ; Land Cover Change; Sweden; WaterBase; Earth and Environmental Sciences;

   Abstract : There is increasing pressure on freshwater systems due to excessive nutrient loading by anthropogenic sources. In Sweden, freshwaters have become browner due to increasing exports of organic matter from soils into streams, rivers, and lakes. READ MORE

3. 22. Mercury and methyl mercury release in soil and water - their relationship with different properties in Skogaryd

   University essay from Göteborgs universitet/Institutionen för geovetenskaper

   Author : Linnéa Johansson; [2020-07-08]
   Keywords : mercury; methylmercury; demethylation; pH; dissolved oxygen and total organic content;

   Abstract : In Skogaryd research site, water samples were taken and analysed for total mercury (Hgtot) and methylmercury (MeHg) concentration along with the pH, dissolved oxygen (DO) and total organic content (TOC). This to give the condition of the site before the forest is clear-cute and a part of the land rewetted to a wetland. READ MORE

4. 23. Hydrological catchment analysis from characterisation of organic matter in stream water

   University essay from Göteborgs universitet/Institutionen för geovetenskaper

   Author : Hannes Berg Wiklund; [2020-02-05]
   Keywords : Organic matter; Time-of-flight mass spectrometry; aquatic chemistry; catchment hydrology;

   Abstract : Organic matter (OM) in aquatic systems is a complex field which have rapidly developed during the last decade due to the introduction of high resolution mass spectrometers. The composition of OM in the aquatic environment is directly dependent on factors such as oxygen supply, pH and the flow rate in the local system. READ MORE

5. 24. Development and Testing of a Hydro-Chemical River MixingModel to Investigate Sources of Carbon and Mercury in the Mackenzie River Basin, Canada

   University essay from Uppsala universitet/Luft-, vatten- och landskapslära

   Author : Torbjörn-Johannes Erikson; [2020]
   Keywords : mercury; Hg; POC; DOC; Mackenzie River; kvicksilver; Hg; DOC; POC; Mackenziefloden;

   Abstract : Mercury, Hg, is found in Arctic biota in alarming quantity, posing a potential health risk for the local population. It is believed that the large Arctic rivers contribute to this. The Mackenzie River annually transports approximately 325 km3 water to the Arctic Ocean, which is ca 10% of the freshwater received. READ MORE

6. 25. Decreasing organic nitrogen concentrations in European water bodies - links to organic carbon trends and land cover

   University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Author : Alexis Cazorla; [2020]
   Keywords : geography; GIS; physical geography; organic nitrogen; organic carbon; land cover; eutrophication; Europe; Earth and Environmental Sciences;

   Abstract : European rivers experience increasing concentrations of total organic carbon (TOC) from terrestrial sources due to factors involving changes in land use, climate and soil acidity. However, low interest is given to the evolution of total organic nitrogen (TON) concentrations in surface waters, the links with TOC concentrations and the influence of the surrounding land cover on nutrient inputs. READ MORE