Identifying fly ash at a distance from fossil fuel power stations

摘要: A method has been developed to identify fly ash originating at fossil fuel power stations, even a distance where the level is lower by factor of 1000 from that close source. Until now such detection difficult and uncertain. The technique combines collection particles, measurement magnetization coercive field, microscopy. analysis depends on fact iron sulfide in fuels form spherical magnetite. These particles have relatively high field Hc, near 135 Oe, compared with airborne particulates soil erosion which an Hc ∼35 Oe. any sample therefore gives indication for percentage relative total amount magnetic material airborne. concentration large, isolated coal burning station found fall off source, approximately as D-1. As D increases there drop associated reduced fl...