Sökning: "trace metals"
Visar resultat 1 - 5 av 88 avhandlingar innehållade orden trace metals.
1. Trace metals in the atmosphere : the wet deposition of trace metals : the selenium cycle
Sammanfattning : Cd, Cu, Fe, Mn, Pb and Zn concentrations in wet deposition have been monitored in Sweden since the autumn of 1983. Concentrations of these elements are highest in southern Sweden and decrease northward. Examination of enrichment factors, relative to crustal material, indicate that the major source of Cd, Cu, Pb and Zn is anthropogenic emissions. LÄS MER
2. The trace of metals : Use, emissions and sediment load of urban heavy metals
Sammanfattning : Urban areas have been considered potential ecological hot spots for metal pollution. This is the result of three trends. First, the 20th century saw a rapid increase in the use of many materials, including metals, in the industrialized world. Second, urbanization has made towns and cities areas nodes of material flows. LÄS MER
3. Road traffic metals : sources and emissions
Sammanfattning : As the environmental regulations and technical progress have forced the factories’ old “end of pipe” solutions to improve, the metal emissions from point sources have decreased. Instead, the diffuse consumption emissions from goods in use now are in focus. LÄS MER
4. Electrochemical detection of trace metals: from traditional techniques to new ultrathin membrane electrodes
Sammanfattning : Accurate detection of trace metals in environmental waters is an analytical challenge that is still open for the time being. The current state of the field reveals the predominance of the so-called hanging mercury drop electrode (HMDE) for multi-metal detection by means of anodic stripping voltammetry (ASV) readout. LÄS MER
5. Trace metals in Swedish forest lakes : factors influencing the distribution and speciation in water
Sammanfattning : .... LÄS MER