Ferromagnetic properties of forest soils being under the influence of industrial pollution : Air Pollution and Forest Decline. 14th International Meeting for Specialists in Air Pollution Effects on Forest Ecosystems

1989

S. 201-207

1 Abb., 4 Tab., zahlr. Lit. Ang., En, Zfsg. En

Unselbständiges Werk

200034674

It is known from investigations on the mineralogical compositions of dust iron and steel manufacture as well as on fly ashes from power stations, that during the metal melting processes and also during hard and brown coal combustion there can appear such iron sediments which show ferromagnetic properties as: magnetite and maghaemite. The ferromagnetic properties of dut from power stations as wall as metal melting has been defined with the help of an apparatus specially built for this purpose. The ferromagnetism of dust from metal melting ranged from 29'000 to 33'000 Hz/10g and of dust from power stations from 2100 to 13'000 Hz/10g. The upper layers of forest soils in the Katowice region and also in the Krakov and Turow regions show ferromatnetism ranging from 1000 to 3500 Hz/10g. Forst soils with a weak impact from power stations indicate values below 500 Hz/10g. The ferromagnetixm of upper layers of forest soils in the region of the Harz mountains ranged from 372 to 436 and in the Rafzregion in Switzerland from 13 to 312 Hz/10g. Investigating the systems: iron inoalslag - fly ashes - stack ashes ist has been found that 19 % of the iron introduced by coal goes through the entire systems and is emitted by the stacks of power stations. The contens of iron in hard coal ranges from 1,4 to 2,0 % and ain fly ashes from 6,2 to 8,8 %. The industry and the mungicipal economy consume yearly 140-160 min tons of hard coal, from which about 70 min tons are burnt up in gernerating plants, together with about 60 mln sumed, that the increase of ferromagnetism in upper layers of forest soils is caused by atmospheric deposition of iron compounds, the ource of which is hard and brown coal compustion and locally iron and steel manufacture. The correlation coefficient between ferromagnetism and the total amont of iron in fly ashes ranges from 0,75 to 0,92.