Molybdenum-Tungsten(Tungsten-Molybdenum)
Molybdenum (Mo) and tungsten (W) are two elements in
the same column of the periodic table. They also behave similarly in nature.
The average concentration in the Earth's crust is 1.5 ppm for both elements. Molybdenum
is an essential nutrient for plants and animals. At large concentrations, Mo
may be toxic. This is sometimes the case for leachates from alkaline ashes. Tungsten
is an important strategic metal that is used in a variety of industrial
applications. It is usually mined from scheelite, CaWO4, och wolframite,
(Fe,Mn) WO4. Tungsten is released to the environment, e.g. through its use in
winter tires and ammunition. On the whole, the environmental behaviour of tungsten
is not well known.
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