The Chemical Character And Sources Appointment Of Pollutants In Wet Precipitation At High And New Technology Industry Development Zone In Jiaozuo City

In this paper, a sampling site was established on Henan Polytechnic University for investigating the distribution of chemical composition concentrations of precipitation and sources of pollutants in precipitation at High and New Technology Industry Development Zone in Jiaozuo City. From the October, 2009 to the September, 2010, forty precipitation samples were collected and were measured by instruments to analyz the temporal variation, the constituents, density lever, pollution feature and sources of precipitation. The conclusions were as follows:(1) The range of electric conductivity in precipitation was from 10.4μs/cm to 1780.1μs/cm, and the annual volume-weighted mean electric conductivity value was 153.3μs/cm. The electric conductividy values in spring and winter were lower than summer and autumn.(2) Ca²⁺ and NH₄⁺ were the main cations in precipitation; SO₄^2- and NO₃^- were the main anions of precipitation, and the ratio of SO₄^2- and NO₃^- was 3.37, belonging to sulphuric wet deposition. There was obvious seasonal variety of the anions and cations, incorporating that in the winter and springtime the concentrations of ions were higher than summer and autumn, excluding NH₄⁺. The percent of secondary pollutants (SO₄^2-, NO₃^- and NH₄⁺) in precipitation was 45%. The mean electric conductividy value and the mean concenteation of anions and cation in snow were higher than them in rain.(3) The concentrations of Fe, Mn, Zn, Ba and Cu accounted for 86.1 percent of the total heavy metals concentrations in precipitation. The maximum concentrations of Cu, Cd, Fe, Pb and Mn in precipitation were above the National standard of Earth's surface water and the main pollution elements were Ni, Cu, Mn and Cd. In winter the concentrations of Cu, Ni, As and Fe were higher than summer, but in summer the concentrations of Cr, Zn, Cd and Pb were higher than winter.(4) Na⁺, K⁺ and Mg²⁺ were partly from the oceans. Na⁺, K⁺, Mg²⁺ and Ca²⁺ were the coexistence elements in soil. Cl- was not only from the oceans, but also was from the locality emission of chemical engineering. NO₃^- and SO₄^2- were mostly from the combustion of fossil fuel. Cr, Sr, Ba, Mn, Ni, Cu, Zn, As and Cd were significancly enriched in precipitation, and were all from man-made pollution sources.