Papers by Auri Koivuhuhta
DR2800 spektrofotometrin soveltuvuuden testaus vesinäytteille
Kirjallisuuskooste kromin ympäristögeokemiallisesta luonteesta ja tutkimusmenetelmistä–painoalueena Suomi
… . Saatavissa: arkisto. gtk. fi/index. php, 2006
... Suomen maaperän happamissa olosuhteissa esiintyvän kromin vallitseva olomuoto on yleensä Cr(I... more ... Suomen maaperän happamissa olosuhteissa esiintyvän kromin vallitseva olomuoto on yleensä Cr(III) (Kollanus & Näätsaari 2003). Kromi(VI):n määrään vaikuttavat luonnossa vallitsevat hape-tus-pelkistystila ja etenkin pH (James 2001, Pantsar-Kallio et al. 2001). ...
New kinds of slags and ashes will be created by waste incineration, which will become more common... more New kinds of slags and ashes will be created by waste incineration, which will become more common in Finland in the near future. The processing of these slags and ashes will contribute significantly to the operating costs of incineration plants, and will ...
This guide describes best available techniques (BAT) for the management of extractive waste and f... more This guide describes best available techniques (BAT) for the management of extractive waste and for the prevention and reduction of negative impacts from management of extractive waste. The guide is based on European Commission Joint Research Centre’s publication "Best Available Techniques Reference Document for the Management of Waste from Extractive Industries" and on Finnish national guidelines, guides and legislation. The guide discusses best available techniques for extractive waste management throughout the life cycle of the extractive waste sites. The generic BAT conclusions address corporate management, information and data management, and the waste hierarchy for extractive activities. The risk-specific BAT conclusions describe techniques for preventing and reducing adverse effects on the environment and human health, as well as techniques for ensuring the structural stability of extractive waste deposition sites, and ensuring physical and chemical stability of ext...
Kaivannaisjätealueiden peittomateriaalivalinnan koerakenteet ja -järjestelyt. Kirjallisuusselvitys
Bulletin of the Geological Society of Finland, 2008
A new application of the NH 2 column method has been tested for speciation of Cr(VI) in soil wate... more A new application of the NH 2 column method has been tested for speciation of Cr(VI) in soil water and surface water. Soil water and surface water samples were collected from two sites near the world's largest stainless steel production plant, Outokumpu Tornio Works, about 10 km south of the City of Tornio, Finland. Dissolved chromium species [Cr(VI) and Cr(III)] were quantified immediately from the water samples with the NH 2 (aminopropylmodified silica) column method and a graphite furnace atomic absorption spectrophotometer (GFAAS) and then three months later after the collection. The sum of Cr species concentration determined by the method was equal to total dissolved Cr concentration measured by inductively coupled plasma mass spectrometry (ICP-MS). The method was precise and selective for environmental water samples at low concentrations, and it fractionated Cr species with 100 % specificity without noteworthy interference from other metals. Some difficulties appeared with Cr standard solutions made with deionised water. In addition, the soluble form of Cr(VI) was preserved in a stable form for three months both in the refrigerator and freezer, and almost all the dissolved Cr was in the Cr(VI) form.
Mittalaitevertailu vedenlaadun tarkkailussa käytettäville kenttälaitteille: YSI 556, WTW 330 SET ja 340i SET
Factors that affect the occurrence of Cr(VI) in acidic mine waters (abstract)
The Management and restoration of surface water bodies receiving mine waters ("KaiHali") Effects ... more The Management and restoration of surface water bodies receiving mine waters ("KaiHali") Effects of mining activities on watercourses have been under active public debate as a consequence of the Talvivaara gypsum pond leakage. There was an urgent need to develop prediction tools for mine water dispersal, chemical stratification of the receiving lakes, ecological effects, and sedimentation of harmful substances. In addition, information is needed on safe restoration of mining-affected watercourses. Proper management of mine water discharges is essential for sustainable mining in Finland. The Management and restoration of surface water bodies receiving mine waters ("KaiHali") project was planned to develop expertise and business opportunities in the management of mine water discharges to surface waters. The project also focused on management and restoration of water bodies taking into account properties specific to mine waters such as reactivity, high salt content and accumulation of contaminants in biota. Further specific properties such as background concentrations for metals in ecological quality standards and physical properties affecting on lake stratification patterns were taken into account. The project developed modelling of mine waters by the VEMALA-watercourse modelling tool. Based on several case studies, the model worked well and helped evaluation of the effects of mining. Effects on lake stratification were estimated with MyLake-software. In addition, the project applied bioligand models (BLM) to characterize bioavailable concentrations of nickel, zinc and copper and produced toxicity data in local water quality conditions for improvement work of current BLM models. Mixture toxicity models of heavy metals were demonstrated for surface waters and sediment as an early warning assessment tools for mining affected water bodies. Kaihali-project described the process of accumulation of harmful substances in aquatic sediments, including a detailed report on sediment surveying methods for mining affected lakes. The Project also produced a large database of typical changes in sediment chemistry in mine affected lakes and restoration of permanently stratified lakes. An autonomous research vessel was also utilized as a tool of rapid lake survey of mine affected lakes. Restoration of mine affected lakes included also chemical modelling and pilot-level field experiments for removal of chemical stratification. These data and modeling approach are usable in the planning phase of restoration. Self-purification capacity of contaminated sediments was investigated, but further feasibility studies are needed for method development. Kaihali-project produced a toolbox and a set of background material for research institutes, companies, consultants and environmental authorities to promote assessment and modelling of mine affected lakes and rivers. The project has enhanced the possibilities for research and development related to sustainable mining.
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Papers by Auri Koivuhuhta