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Variations of Elemental Concentration in PM 10 and PM 2.5. 12 June 2007,Colombo. M.C. Shirani Seneviratne Head, Nulear Analytical Services Sec. Atomic.

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Presentation on theme: "Variations of Elemental Concentration in PM 10 and PM 2.5. 12 June 2007,Colombo. M.C. Shirani Seneviratne Head, Nulear Analytical Services Sec. Atomic."— Presentation transcript:

1 Variations of Elemental Concentration in PM 10 and PM 2.5. 12 June 2007,Colombo. M.C. Shirani Seneviratne Head, Nulear Analytical Services Sec. Atomic Energy Authority SRI LANKA (sseneviratne@aea.ac.lk) National Stakeholders Forum-Sri Lanka- 2007

2 Project Team Members Mrs. M.C.S. Seneviratne Mr. V.A. Waduge Mrs. H.L. Hadagiripathira Mrs. T.N. Attanayake Mr. C.K. Amaratunge(CEA) Mr.R.N.R Jayaratne (CEA) National Stakeholders Forum-Sri Lanka- 2007

3 Contents Introduction Objectives Activities under the Project (2006) Sample collection and Analysis Graphical Data Presentation  Data Evaluation Conclusion National Stakeholders Forum-Sri Lanka- 2007

4 Introduction  Atomic Energy Authority (AEA) jointly with Central Environmental Authority (CEA) participates in the RCA sub project on “IAEA/RCA Subproject on Improved Urban Air quality Management through Isotope and related Techniques (RAS/7/013) since 2000. National Stakeholders Forum-Sri Lanka- 2007

5 National Objectives To measure the elemental composition of the coarse and fine air particulates using the nuclear analytical technique ED-XRF in the selective sites to monitor the long-term trends. Identifying the main Pollutant sources and qualifying the source contribution. Identifying the direction of local point sources and long term pollutant dispersion.

6 Sample Collection And Analysis Sampling Period: 2000 to up to date Sampling sites: 1. Air Quality Monitoring Station 2. AEA Premises Air Samplers : Gent PM 10 Air Sampler Particulate Size: PM10-2.5 and PM2.5 Elemental Analysis : ED-XRF Black Carbon : Stain Smoke Reflectometer. National Stakeholders Forum-Sri Lanka- 2007

7 Gent PM 10 Air Sampler National Stakeholders Forum-Sri Lanka- 2007

8 X-RAY FLUORESCENCE ANALYSIS Well Established Fast Non destructive multi-Elemental analysis cost effective Method National Stakeholders Forum-Sri Lanka- 2007

9 Time Series-PM 2.5 &PM10 (AEA) Mean 57 Mean 24 The average PM 2.5 and PM 10 values are 18  g/m3 and 54  g/m3 which exceed the USEPA values. The average PM 2.5 particulates component of PM 10 is 42% at the AEA station. National Stakeholders Forum-Sri Lanka- 2007

10 Time Series- Black Carbon (AEA) Variation of the black carbon measurements in the fine filters collected at AEA site is shown in above. The Average of BC is 10  g/m3. National Stakeholders Forum-Sri Lanka- 2007

11 Time Series-PM 2.5 &PM10 (AQM) Mean 75 Mean 29 The annual averages of PM 10 and PM 2.5 were measured as 50  glm3 and 17  g/m3 in 2006 respectively. This Indicates about 38% of fine particulates are in PM 10 mass fraction. National Stakeholders Forum-Sri Lanka- 2007

12 Time Series-Black Carbon (AQM) The average concentration of BC is 8  g/m3 and it was nearly 1/2 of the total PM. 2.5 mass concentration. This indicates that the combustion source dominates in the fine fraction in this site. National Stakeholders Forum-Sri Lanka- 2007

13 Summary of PM 10, PM 2.5 and BC in two sites National Stakeholders Forum-Sri Lanka- 2007

14 Comparison of Mass Concentration in two sites Both size fractionated particle masses were lower in site 1 comparing the last few years. The following factors can be stated for negative trends for particulates pollution.  Better management practice for motor traffic control.  Introducing the standards of vehicular emissions and on spot emission testing.  Improving the Public transportation.  Phasing out the old vehicles from the main roads with regards to quality of emissions. National Stakeholders Forum-Sri Lanka- 2007

15 Box plot for Elemental Concentration in Fine Filters (AEA) National Stakeholders Forum-Sri Lanka- 2007

16 Box plot for Elemental Concentration in Fine Filters (AQM) National Stakeholders Forum-Sri Lanka- 2007

17 Summary of Elemental Concentration Sulphate and BC are dominant elements in the fine fraction collected from both sites. K and Zn are significant in the fine particles when compared with the other anthropogenic elements. Zn is released and is often observed as a white smoke coming from the two strokes engine exhausts. Pb is not significant in the fine fraction when compare with the other elements., ( unleaded fuel was introduced in 2001 to improve the air quality.) National Stakeholders Forum-Sri Lanka- 2007

18 Source Apportionment of the Fine particulate matter collected from AEA Station The elemental Concentration measured on 100 fine filters from AQM Station were used for PMF Analysis. - 28 key elements analyzed by ED-XRF were selected for PMF. - Data Quality control using Box & whisker of Statgraphics. National Stakeholders Forum-Sri Lanka- 2007

19 Source Identification (PMF) Soil 40 % Sea Salt+Vehi cular 33 % Sulfer 12% AEA –Fine Fraction (Average RCM 26ug/m3 ) National Stakeholders Forum-Sri Lanka- 2007

20 Identified Sources and Finger Print Elements from PMF –AEA Site PMF Factors High loadingMass contrib ution Main sources Potential source location 1S, Mg, Al, Si, Ca, Sn, Ti 40%SoilPoint source and long term dispersion are not identified. 2V, Sc, K, S, P27%Sulphate /Smoke 3BC, Cl, K, Cr, Fe, Co, Ni, Cu, Zn, Br, Rb, Sr, Cd, Cs, Ba, La,Pb 33%Vehicular Emission/R efineries National Stakeholders Forum-Sri Lanka- 2007

21 Sea Salt 33% Soil 8% Sulfer 29% Vehicular 30 % AQM- Fine Fraction (Average RCM 29 ug/m3) Source Identification (PMF) National Stakeholders Forum-Sri Lanka- 2007

22 Identified Sources and Finger Print Elements from PMF –AQM Site PMF Factors High loadingMass contrib ution Main sources Potential source location 1Al, Si, K, Ca, Sc, Ti, Fe 8%SoilPoint source and long term dispersion are not identified. 2Na, Mg, Cl33%Seaspray 3P, S, V29%Sulphate 4BC, Cr, Fe, Co, Ni, Cu, Zn, Br, Rb, Sr, Cd, Sn, Cs, Ba, La, Pb 30%Vehicular Emission National Stakeholders Forum-Sri Lanka- 2007

23 Air data with local meteorology The local meteorological information could be useful in interpreting source apportionment results. Multiple methods (CPF and NPR) are available to combine the compositional data with meteorological data to explore the directionality of possible sources or source areas that are contributing to the PM Concentrates observed at the sampling site. PM 2.5 and EC concentration were treated with meteorological data to identify the source direction. National Stakeholders Forum-Sri Lanka- 2007

24 Comparison between CPF and NPR plots for the BC in AQM site NPRCPF These plots indicate actual direction of a fuel burning electricity production plant and emissions from the direction of the central railway station in Colombo city. National Stakeholders Forum-Sri Lanka- 2007

25 Use of HYSPLIT-4 Back Trajectory Model. Dispersion models describe the transport of the particles from a source to the sampling location and it can be used to examine the motion of the atmosphere forward or backward in time. One of the uses for the trajectories is to examine the origins of observed spike in the time series of element or source species. National Stakeholders Forum-Sri Lanka- 2007

26 Time Series of S measured in AEA. It can be suggested that both event are associated with ship’s emissions from this major shipping route due to large ocean- going ships burning low grade residue oils which have influence on long term sulphate in PM 2.5 National Stakeholders Forum-Sri Lanka- 2007

27 Conclusions I This project continues positively in Sri Lanka for the last few years in Collaboration with the End-user Institution. I Data of PM 10, PM 2.5 and elements and results of the Source Apportionment Technique can be utilized for:  the identification of long-term trends of pollution  contribution of major pollutants  local and long term transport pathways of specific sources. I The findings will be helpful to implement the air quality management strategies by the relevant Authorities.. I The participation of AEA in this project complements the on going national air quality monitoring programme effectively. National Stakeholders Forum-Sri Lanka- 2007

28 Acknowledgement The Technical Assistance provided by IAEA and in kind contribution to analyze our samples by EDXRF at Prof. Hopke’s laboratory are acknowledged. National Stakeholders Forum-Sri Lanka- 2007

29 Thank you National Stakeholders Forum-Sri Lanka- 2007

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