|
In this paper, Urumqi Toutunhe radar, new urban satellite stations, laboratories and Namsan mountain rings collection 2009 Poplar Ditch weather TSP (TSP) samples were analyzed temporal distribution TSP mass concentration, microscopic morphology, wherein the water-soluble inorganic measured ionic components. The main conclusions are as follows: (1) TSP mass concentration as follows: 2009 new urban satellite station's annual average concentration of 0.4838mg / m 3 , higher than the days of mountain rings Laboratory ( 0.4536mg / m 3 ) and Touzhunhequ radar (0.2276mg / m 3 ), three places higher than the national average concentration two standard (0.2000 mg / m 3 ); radar, satellite stations and Ring Laboratory quarter average concentrations are highest in winter and lowest in summer, while in Nanshan Poplar Ditch TSP concentrations were compared with the highest summer season, autumn minimum; urban TSP winter months the average monthly to maintain a high level of concentration, less affected by human Poplar Ditch station TSP concentration changes were small; sampling date date TSP mass concentration and meteorological conditions and pollution emissions are closely linked . (2) morphology of Urumqi TSP obvious seasonal characteristics and spatial characteristics, namely spring TSP large and irregularly shaped particles, may be derived from the dust; summer TSP particles are few and small, may contain soil dust and pollen; Fall TSP showed more soot particle aggregation fluffy chain; winter TSP larger particles, mostly round, is a typical form of coal fly ash. TSP urban particulate matter more than the number of Poplar Ditch, autumn and winter coal greater impact on urban morphology TSP. TSP Urumqi mainly containing Si, S, Ca, Al, Fe, Mg, Cl, Na. Element content in TSP significant spatial and temporal characteristics of TSP in the spring and summer Urumqi Si, Ca, Al, Na, Mg content is higher, autumn and winter, Si, S, Ca, Al, Fe, Cl content is very high. Downtown in TSP S, Fe, Al major share over the same period compared to Poplar Ditch, Poplar Ditch TSP fewer types of elements representing coal, industrial emissions characteristic elements S, Fe content is not high. (3) using the Dionex ICS-3000 Ion Chromatography of the four sites in the TSP samples collected water-soluble inorganic ionic component analysis, detection of the four inorganic anions (F - , Cl - , SO 4 2 - , NO 3 - ), the four stations are SO 4 2 - concentrations are highest Touzhunhequ radar 62.87μg / m 3 , a new urban satellite station 92.34μg / m 3 , day mountain ring laboratory 116.97μg / m 3 and Poplar Ditch 23.92μg / m 3 , SO 4 < / sub> 2 - may be derived from the air SO 2 conversion, F - lowest concentration; five kinds of inorganic cations (Na , NH 4 , K , Mg 2 , Ca 2 ), the four stations are Ca 2 concentrations are highest radar 10.68μg / m 3 , satellite stations 21.18μg / m 3 ring laboratory 15.11μg / m 3 and Poplar Ditch 8.17μg / m 3 , Ca 2 may be derived from wind and ground dust , K of the lowest concentration. Ion concentration of each station has obvious seasonal variation, the heating period the ion concentrations were significantly increased, SO 4 2 - , NO 3 - largest increase; urban TSP is the total ion 172.57μg / m 3 , Poplar Ditch TSP is the total ion 40.83μg / m 3 ; the TSP [NO 3 - ] / [SO 4 2 - ] values ??are below 0.2, Description fired the TSP-like water-soluble components in the greatest contribution that the largest contribution from stationary sources. The correlation coefficients of ions that they have a good correlation. (4) different weather conditions on the TSP in Urumqi NH 4 , Ca 2 , NO 3 - and SO 4 2 - concentrations had a significant effect. Precipitation scavenging for ions, so that in the TSP concentration decreases. Windy and dusty weather will make the TSP Ca 2 concentrations increased significantly, while the other ions added value is very small. Continuous contamination date, the ions will accumulate in the atmosphere to a higher concentration, and its value over the same period of up to 2-7 times the sunny conditions. Meteorological factors on the heating period TSP ion concentration greater impact. Non-heating period Urumqi TSP ion concentration caused mainly by natural factors, soil dust and construction dust impact.
|