Search results for "kemikaalit"
showing 9 items of 19 documents
Toward sustainable environmental quality: Priority research questions for Europe
2018
The United Nations’ Sustainable Development Goals have been established to end poverty, protect the planet, and ensure prosperity for all. Delivery of the Sustainable Development Goals will require a healthy and productive environment. An understanding of the impacts of chemicals which can negatively impact environmental health is therefore essential to the delivery of the Sustainable Development Goals. However, current research on and regulation of chemicals in the environment tend to take a simplistic view and do not account for the complexity of the real world, which inhibits the way we manage chemicals. There is therefore an urgent need for a step change in the way we study and communic…
Kemimekaanisen puhdistamon toimintaan vaikuttavien tekijöiden hallinta
2007
Development of ultrasound-assisted digestion methods for the determination of toxic element concentrations in ash samples by ICP-OES
2011
The present thesis introduces several ultrasound-assisted digestion methods developed for the determination of toxic element concentrations in ash samples by inductively coupled plasma optical emission spectrometry (ICP-OES). Ultrasound-assisted digestion is a quite new technique used for sample pre-treatment purposes, especially in difficult sample matrixes. Elements determined are As, Ba, Co, Cr, Cu, Ni, Pb, Sb, Sr, V, and Zn. Most of the elements determined exist at a trace or ultra trace level in ashes and most are potential risks in the environment or human body even at low concentrations. Most of the selected elements can be determined directly by ICP-OES, but for the determination of…
Crystalline forms of selected agrochemical actives : design and synthesis of cocrystals
2012
The research described in this disseration covers the crystal form screening of two analogous agrochemical actives, thiophanate-methyl and thiophanate-ethyl, as well as the discovery of seven 4-hydroxybenzoic acid cocrystals of selected agrochemical actives. Polymorphs are crystal forms of a compound that have the same composition, but a different arrangement of molecules. Cocrystals are molecular crystals composed of two or more compounds, and refer mainly to crystals which contain compounds that are solids at standard conditions. Solvates are forms that have molecules of solvent in the crystal lattice and these include hydrates, in which the solvent is water. The crystal forms of organic …
Hiilihydraateista bioteknisesti valmistettavat merkittävät teollisuuskemikaalit
2010
Kemikaalien ympäristökohtalon mallintaminen
2016
Ympäristö ja ihmiset altistuvat suurelle määrälle erilaisia antropogeenisia haitta-aineita. Vaikka useiden ongelmallisten kemikaalien vaikutuksia on jo onnistuttu rajaamaan, uusia riskitekijöitä ilmenee tekniikan ja seurantamenetelmien kehittyessä. Suorien mittausten lisäksi ympäristön haitta-ainepitoisuuksia voidaan selvittää laskennallisesti mallintamalla. Mallinnus on lähtökohtaisesti nopea menetelmä ja mahdollistaa parhaimmillaan suurtenkin aineistojen läpikäynnin hyvin vähäisellä vaivalla. Toisaalta tulevaisuutta ja vielä toteutumattomia tilanteita voidaan arvioida ainoastaan laskennallisesti. Mackayn fugasiteettiperiaatteeseen pohjautuvat jakaumamallit ovat yleisesti käytetty ympärist…
Analysis of malodorous nitrogen-containing compounds in paper and board products
2007
Stakeholder perceptions of wood-based products in the built environment : a literature review
2022
Current global environmental challenges, such as climate change, set an urge to seek renewable low-emission alternatives to substitute fossil fuel-derived products while transitioning towards circular bioeconomy. Wood has proven to be a versatile renewable material that is able to substitute fossil-based materials. However, the market potential and uptake of wood-based products is also dependent on the preferences of consumers and other stakeholder groups. This paper presents a systematic literature review of studies examining stakeholder perceptions of wood-based products, which also resulted in the identification of research gaps and suggestions for future research directions. The results…