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Study on Acid Buffering Capacity of PM10 in Jinan City

Author: LiuYuTang
Tutor: LiuZeChang
School: Shandong Institute of Architecture
Course: Environmental Engineering
Keywords: PM10 Acid buffering capacity Acidity Acidic substances Alkaline substances Jinan City
CLC: X513
Type: Master's thesis
Year: 2010
Downloads: 50
Quote: 0
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Abstract


Our northern S02 total emissions higher than the South, but acid rain pollution levels than southern lower acid buffering capacity size of atmospheric particles precipitation pH, it may cause acidification of precipitation, precipitation may The acidic played and the role. Some of our cities have been pre-launched the acid buffering capacity study of atmospheric particulate matter, but most of them are short-term studies. Jinan City as a major northern cities of China, and its particles are seriously polluted, PM10 is the primary pollutant in the ambient air, but so far no studies have reported on acid buffer capacity of Jinan City, atmospheric particulate matter. Jinan City, the papers for the study area, seven days ambient air PM10 filter samples collected in the roof of Shandong Architecture University of Science and Technology (15m) from March 2009 to February 2010 mid-month. Jinan City PM10 acid buffer capacity (ΔCb) of study, the impact factor of the measurement method using ion chromatography (determination of SO42-, NO3-, CL-, etc.), atomic absorption spectrometry (determination of K, Na, Ca2, Mg2, etc.) and spectrophotometry (Determination of NH4). The combined acid buffering capacity of respirable particulate matter (PM10) data at home and abroad atmospheric particulate matter research data in Jinan City in recent years to expand data analysis, specific experimental results are as follows: (1) observation points ambient air PM10 annual average acidity and an average annual acid buffering capacity for 0.041neq/m3 and -35.80neq/m3, particulate matter less acid buffer capacity. PM10 acid buffering capacity change mainly year: winter PM10 acid buffer capacity minimum for -97.25neq/m3; autumn -33.98neq/m3; summer and spring, respectively -9.88neq/m3 and -2.09 neq/m3; PM10 acidity Spring gt; winter gt; summer gt; fall. Around the observation point in the whole PM10 can not effectively neutralize the acidic substances in the atmosphere, but can enhance the acidity of the precipitation. Fall, winter, ambient air PM10 pollution more serious, spring, summer, less polluting; of PM10 acid buffering capacity and mass concentration was positively correlated in the spring and summer (March to August), autumn and winter (September to February) but a negative correlation mainly because the PM10 acid buffering capacity is not only related to the mass concentration of particulate matter and particulate matter components are closely related. (2) simultaneous observation by comparing July 2009, Shandong Jianzhu University, city center PM10 acid buffering capacity data, found that the PM10 acid buffering capacity building University is higher than the city center, but little difference in the overall lower; acidity of particulate matter H concentration is from 0.33 to 0.91 times the center. Compared to other cities at home and abroad and region, the Jinan City PM10 annual average acid buffering capacity is relatively low. (3) The comparative analysis of the relationship of the different impact factor: the main factors of PM10 acid buffering capacity (ΔCb), NH4, SO42-, NO3-, Ca2, Mg2, etc.. With the PM10 acid buffering capacity change, SO42-mass concentration Spring lt; summer lt; fall lt; winter, the concentration of NO3-quality spring lt; winter lt; summer lt; fall; acidic substances S042-acid buffering capacity of PM10 between S042-about N03-1.8 to 4.5 times, Jinan City PM10 cause salts are sulfate. The alkaline material aspects, Ca2 mass concentration Spring lt; fall lt; summer lt; winter the Mg2 and PM10 acid buffer capacity is high, but lower Mg2 content, time-varying characteristics not obvious. Analysis of calcium and magnesium the main contribution salts PM10 acid buffering capacity, and a positive correlation with the acid buffering capacity. (4) NH4 with the PM10 acid buffering capacity of the negative correlation (-0.67), NH4 mainly as a balance of SO42-and NO3-cation, has obvious seasonal distribution: Summer lt; fall lt; spring lt; winter. Higher, indicating that the NH4 content of aerosol in the presence of a more acidic ion indirectly indicates PM10 acid buffer capacity has decreased. (5) the perfect double source apportionment (NCMB) to determine the source class in the ambient air PM10 acid buffering capacity calculated based on the calculation of the various types of open-PM10 on the amount of the contribution of the acid buffering capacity of the unit volume of ambient air PM10 show that : dust (0.14neq/m3) gt; building the dust (0.059 neq/m3) gt; gt soil dust (0.053 neq/m3); gt of coal soot (0.036neq/m3); the road dust (0.033 neq/m3). From an elevated angle of the acid buffering capacity of particulate matter to consider the need to synchronize governance dust while to carry out the control of of acidic gases sulfur dioxide and nitrogen oxides, otherwise it will cause acidic pollution deteriorate again. Through the analysis of the impact of different factors on the buffering capacity, that at this stage of Jinan City, PM10 acid gas carrying capacity, and provide data support and technical support to carry out a more comprehensive the Jinan Municipal PM10 acid buffering capacity study conclusions can be for the future.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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