Search for dissertations about: "water column stability"

Showing result 1 - 5 of 14 swedish dissertations containing the words water column stability.

2. 1. Phytoplankton and Physical Disturbance : Seasonal dynamics in temperate Lake Erken, Sweden

   Author : Yang Yang; Kurt Pettersson; Peeter Nõges; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Phytoplankton dynamics; high-frequency measurements; thermal stratification; water column stability; equilibrium; disturbance;

   Abstract : Phytoplankton mirrors changes in the environment and plays an important role in biogeochemical processes. Phytoplankton dynamics is the outcome of both autogenic succession and external disturbances. READ MORE

4. 2. Leaching of Polycyclic Aromatic Hydrocarbons Using a Column Method

   Author : Anja Enell; Avdelningen för kemiteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Kemiteknik och kemisk teknologi; Naturvetenskap; Chemical technology and engineering; Natural science; Miljöstudier; Environmental studies; coal tar; PAHs; desorption; soil; combustion residues; remediation; availability;

   Abstract : Polycyclic aromatic hydrocarbons (PAHs) are a group of organic pollutants of great environmental concern, due to their toxicity, carcinogenicity and long persistence in the environment. To determine the potential risk associated with PAHs released from contaminated soil or waste materials, knowledge is required on the leachable concentrations of PAHs and the amounts available for release. READ MORE

5. 3. Formation, uptake and bioaccumulation of methylmercury in coastal seas : a baltic sea case study

   Author : Aleksandra Skrobonja; Erik Björn; Agneta Andersson; Anne L. Soerensen; Marc Amyot; Umeå universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Mercury; methylmercury; bioaccumulation; mesososm; isotope tracers; methylation; demethylation; stability constant; kinetic model; coastal sea; ICPMS; LC-MS MS;

   Abstract : Methylmercury (MeHg) is a potent neurotoxin which can bioaccumulate to harmful levels in aquatic food webs. Methylmercury formation is a predominantly biotic process which involves phylogenically diverse microorganisms (e.g. iron- or sulfate-reducing bacteria). READ MORE

6. 4. Atmospheric pressure ionisation interface considerations for micro column separation with mass spectrometric detection

   Author : Per J. R. Sjöberg; Uppsala universitet; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Chemistry; Kemi; Chemistry; Kemi; Analytical Chemistry; analytisk kemi;

   Abstract : Two miniaturised atmospheric pressure chemical ionisation (APCI) interfaces were developed for micro column separation and their performances were investigated in high temperature open tubular column liquid chromatography and capillary supercritical fluid chromatography (SFC). The most influential parameters, for example, the interface probe position relative to the sampling orifice and the reagent ion plasma composition, were investigated to optimise the ion current signal and stability. READ MORE

7. 5. Algal-Bacterial Photobioreactors for the Degradation of Toxic Organic Pollutants

   Author : Raul Munoz; Bioteknik; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Bioteknik; Biotechnology; symbiosis.; nutrient removal; heavy metals removal; Algal-bacterial systems photobioreactors; toxic organic pollutants;

   Abstract : The aerobic biodegradation of toxic organic volatile contaminants is always limited by the low aqueous solubility of O2. Therefore, intensive bubbling or surface aeration is required to supply the bacterial community with sufficient O2 to carry out pollutant mineralization. This can cause the hazardous volatilization of toxic volatile contaminants. READ MORE