METHOD FOR DETERMINING THE RATE gravitational settling of fly ash emissions of industrial enterprises in the atmospheric boundary layer

摘要

A method for determining the speed of gravitational particle settling fly ash industrial emissions in the surface layer of the atmosphere, which consists in that in a predetermined direction from the industrial plant at different distances from 1 to 5 km are taken at least 5 samples epiphytic moss Pylaisia ​​polyantha (Hedw.) BSG from bark birch, aspen and poplar at a height of 1.5-2 m, in addition, one sample moss selected on the background area from the climatic conditions, with the same study area, and remote by a distance more than 100 km from the industrial q ntrov in a direction opposite to the predominant wind rose, moss samples purified from foreign matter, washed with distilled water, dried at a temperature 80-100ºS and homogenized, made from 5 to 10 parallel representative samples are subjected to their thermal neutron flux irradiation for not more than 5 hours after a decline in activity a safe level Nado determine specific activity of each sample by comparing the intensity of gamma lines radionuclides chemical elements in the sample with the intensity of gamma lines hundred dard samples, determine the concentration of chemical elements in moss samples whose values ​​using the method of least squares approximate the relation of the type: wherein q- background (natural) concentration of the chemical element in a sample in an area remote from industrial plants by a distance not less than 100 km, x - distance from the point of sampling to mosses industrial plant, wherein the parameters θi θopredelyayut method of least squares, and then determine the rate of gravitational settling of the particles fly ash