Study Of The Atmospheric Particles And Precipitation Physical And Chemical Properties In Beibei District Of Chongqing

Chongqing is one of the most serious regional acid deposition in China, the main forms of acid deposition of atmospheric particulates and acid rain. Beibei is the Chongqing’s garden, its acid subsidence situation has its particularity. In order to know the characteristics of precipitation and atmospheric particulates in Beibei, Sites of atmospheric particulates (TSP and PM10) and precipitation were set up in southwest university’s meteorological park andatmospheric and the roof of geographical sciences school from April2011to October2012. Through regular sampling and experimental analysis, the current atmospheric particulate matter mass concentration, water-soluble ion concentration and precipitation conditions and the characteristics of the month and season changes in atmospheric particulate matter and precipitation are analyzed, as well as the relationship between the evaluation of the environment quality condition in the study area.The main conclusion is as follows:The average mass concentration of TSP and PM10are180.52ug/m3and131.17ug/m3, which in accordance with secondary air quality standards.Changes of TSP and PM10mass concentration showed a trend of synchronization; At Season scale order is spring> winter> autumn> summer, maximum density occurs in the spring of2012, the minimum concentration appeared in the summer of2011;The majority of TSP ingredients contained is PM10, particle composition is relatively stable, and PM10has a small proportion of fluctuation;In cloudy rain fog and fine weather conditions, quality of PM10and TSP concentration in the sorting of fine> cloudy> fog>rain, but the proportion of PM10in TSP is less of sunny and cloudy day than rainy and fog day;The average atmospheric particulate matter mass concentration reach secondary standards, air quality days accounted for about70percent, but PM10pollution is the Primary pollutant. The pH value of the atmospheric particles water-soluble ion is neutral, the changes of EC and pH is Synchronous, the EC in the TSP are greater than PM10, the pH is less than the PM10, the change of EC is bigger the pH.The mainly of TSP and PM10water-soluble ions are Na+and Ca2+, Ca2+are mainly distributed in the coarse particles, Na+species are mainly distributed in fine particles, the mainly anionic are SO42’ and NO3-, mainly distributed in the fine particulate matter.ten kinds of ions in TSP and PM10, the standard deviation for the Ca2+, and Al3+and SO42-coefficient of variation is relatively small, that the seasonal concentration changes fluctuation is small, Mg2+、K+、Na+、Cl-and NO3-coefficient of variation is larger, various seasonal concentration volatile, PO43-, F-, the coefficient of variation is very big, each season concentrations fluctuate greatly, especially the PO43-changed obvious inverted "V" glyph.Total water soluble ion concentrations of atmospheric particulates is mostly in cloudy and fog days, less in rainy days, a single ion concentration sorting the TSP and PM10are basically the same, that each ion concentration change with the weather.The average EC of Precipitation is81.08u s/cm, and has a big volatile a year, the average precipitation pH is5.64, less volatile a year, the acid rain frequency was45.83%. Ca2+, NO3-and SO42-ion is the main ions.Atmospheric particulate matter on precipitation acidity alkaline effect, helps to reduce the acidification of rain; Acid subsidence belong to sulphuric acid type, different months p(NO3-)/ρ(SO42-)change trend is consistent, but the change of spring and summer is bigger than autumn and winter.