Browsing by Author "Deeyamulla, M.P."

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Assessment atmospheric metal pollution in Battaramulla using high-volume air sampler and Hyophila involuta biomonitor
(Sri Lanka Association for the Advancement of Science, 2014) Dilhani, G.R.R.; Deeyamulla, M.P.; Jayalath, K.G.
Assessment of the Heavy Metal Concentrations in Mangrove Leaves of Negombo Lagoon
(19th Conference on Postgraduate Research, International Postgraduate Research Conference 2018, Faculty of Graduate Studies,University of Kelaniya, Sri Lanka, 2018) Handagiripathira, H.M.N.L.; Deeyamulla, M.P.; Koichiro, S.
Mangrove ecosystems play an important role in the biogeochemistry of heavy metal contamination in tropical coastal areas. During the last decades, heavy metals are one of the most serious contaminants in those environments due to its toxicity, durability and bioaccumulation problems with the long residence time within the food chain. Mangrove leaves are the primary producer of the food chains or food webs in mangrove ecosystems where there is a direct effect on the human health. The bioaccumulation levels of heavy metals in mangroves can be estimated by assessing such levels in leaves, sediments and water in the study area. This study was a part of a M.Phil. research and the main objective of this study was to assess the concentrations of selected heavy metals to understand the levels of contamination in the mangrove leaves in a selected lagoon system. The 27 locations of Negombo lagoon which is situated in urbanized area in Gampaha District of Sri Lanka was selected for the study. Four mangrove species of Rhizophor amucronata, Rhizophora apiculata, Avicennia marina and Lumnitzera racemosa were chosen since these arethe most common species in the lagoon. Mangrove leave samples categorized as young, matured and old and were collected in the wet and dry seasons of 2015 and 2016. Leave samples were cleaned and oven dried prior to grinding for fine powder. The elemental concentrations of heavy metals, Mn, Fe, Cr, Co, Ni, Cu, Zn, As, Hg and Pb were analyzed in the dried powder of mangrove leaves (297 samples) using Particle-induced X-ray emission (PIXE) technique established in Medical University, Iwate, Japan. The results were evaluated to study the spatial and temporal variations of heavy metal concentrations in mangrove leaves of the Negombo lagoon. The distribution of metals in mangrove leaves were departed and depended on the mangrove species as well as climatic seasons in study period. The most prominent species of R. mucronata, R. apiculata were represented by 262 samples and both species were having same concentration levels except Mn and Zn, which act as essential plant nutrients, were greater in R. apiculatathan the other species. The ranges of metal concentrations (in ppm) of R. apiculata leaves in the studied area were observed in the order: Mn (15.2-453.0) > Zn (5.4-276.4)> Fe (28.6-224.9) > Cu (0.1-9.3)> Cr (0.2-7.3)> Hg (ND-5.9)> Pb (ND-4.0)> Ni (ND-2.3)> Co (ND-1.7)> As (ND-1.0). The heavy metal uptake by young, matured and old leaves were showed significant deviations for most of the studied metals. Cr content in all leaves was same and some metals (ie. Fe) were higher in old leaves and some metals (ie. Zn) were higher in young leaves. A comparative evaluation of studied metals was carried out with the similar studies conducted in the world. In general, heavy metal concentrations in mangrove leaves of Negombo lagoon were lower than the permissible limits as recommended by WHO (1996), except Cr, Zn and Pb
Atmospheric deposition of Polycyclic Aromatic Hydrocarbons (PAHs) around two metropolitan areas in the western province of Sri Lanka, using moss (Hyophila involuta) as a biomonitor
(Sri Lanka Association for the Advancement of Science, 2015) Jayalath, K.G.; Deeyamulla, M.P.; de Silva, R.C.L.
Background Levels of Heavy Metals in Moss Hyophila Involuta as A Bioindicator Using Four Strict Nature Reserves in Sri Lanka: Sinharaja Rainforest, Knuckles Mountain Range, Horton Plains National Park and Hakgala Mountain Forest
(Faculty of Graduate Studies, University of Kelaniya, Sri Lanka, 2016) Jayalath, J.I.K.G.; Deeyamulla, M.P.; de Silva, R.C.L.
Atmospheric deposition of six heavy metals (Zn, Cu, Pb, Ni, Cr and Cd) using the moss Hyophila involuta as a bioindicator was investigated to establish the background levels of heavy metals for different geographical and climatic zones of Sri Lanka. Moss sampling was carried out in four strict nature reserves in different geographical and climatic zones of Sri Lanka, namely Sinharaja rainforest (6°24′–6°27′ N, 80°24′–80°26′ E, 450– 500 m) from wet zone, Knuckles mountain range (7°31′ N, 80°43′ E , 1,000–1,300 m) from intermediate zone, Horton Plains National Park (6°46′–6°48′ N, 80°47′–80°49′ E, 2,000–2,200 m) and Hakgala mountain forest (6°55′ N, 80°48′ E, 1,700–1,800 m) from wet zone and Central highlands using about 10 sampling sites from each location within a month from October to November 2015. Concentrations of heavy metals in moss were analysed by using atomic absorption spectrometer. The atmospheric deposition of heavy metal concentrations in all sampling stations is given for dry weight of moss and the ranges of six elements around four strict nature reserves were 9.58– 65.68, 1.87–9.97, 1.20–10.56, 1.12–7.81, 1.20–10.60 and 0.05–0.36 μg/g for Zn, Cu, Pb, Ni Cr and Cd separately. According to the statistical analysis (one-way ANOVA , p < 0.05), accumulation of Cu, Cr and Cd in moss was not significantly change among four strict nature reserves and accumulation of Ni and Pb in moss was significantly higher around Hakgala mountain forest. Atmospheric deposition of Zn in moss was significantly higher around Knuckles mountain range area than other sampling locations. Therefore background levels of heavy metals in moss can be expressed as as 5.53 (±1.75), 7.23 (±2.11), 4.03 (±1.41), 6.61 (±2.58) and 0.17 (±0.06) μg/g for Cu, Pb, Ni, Cr and Cd respectively for the most of the geographical and climatic zones of Sri Lanka and background levels of Zn can be established as 30.62 (±8.11) and 47.42 (±12.31) μg/g for wet zone including Central highlands and intermediate zone of Sri Lanka respectively.
Biomonitoring of atmospheric heavy metal deposition using moss (Hyophila involuta): Efficiency of different moss bag techniques
(Sri Lanka Association for the Advancement of Science, 2013) Dharmasiri, P.H.A.N.; Deeyamulla, M.P.
Characterization of toluene degrading bacterial species isolated from soil
(International Conference of the Biotechnology Society of Nepal (ICBSN), 2021, 2021) Gunasinghe, Y.H.K.I.S. Y.H.K.I.S.; Rathnayake, I.V.N; Deeyamulla, M.P.
Natural environmental sources around us are actively participating in the bioremediation of hazardous contaminants. Prolonged inhalation of Volatile Organic Compounds (VOC) like toluene affects individual’s health conditions. ...
Characterization of trace metal concentration (Al, Fe, Mn, Cu, Zn, Pb) of bulk precipitation in Kandy district, Sri Lanka
(Faculty of Graduate Studies, University of Kelaniya, 2015) Liyandeniya, A.B.; Priyantha, N.; Deeyamulla, M.P.; Wickramasinghe, W.G.R.C.
The atmospheric precipitation is an important phenomenon in which pollutants are scavenged from the atmosphere. Wet deposition accounts for rain, fog and snow, while dry deposition is the accumulation and fallout of aerosol particles and gases without dissolution of water. It is very important to have baseline data on the chemical composition of the atmosphere to take regulatory measures to control atmospheric pollution in Sri Lanka. The main objective of this study was thus to determine selected trace metals (Al, Fe, Mn, Cu, Zn, Pb) in bulk precipitation samples collected weekly in three sampling locations, namely the University of Peradeniya premises, Polgolla and Kandy for a period of one year from August 2013 to July 2014. Trace metals were determined in filtered and preserved rainwater (bulk) samples using Graphite Furnace Atomic Absorption Spectrometer, and volume weighted mean values of selected trace metals were subsequently calculated. Kandy municipality showed the highest contamination and followed the sequence of Al > Zn > Fe > Mn > Cu > Pb and volume weighted mean concentrations of above sequence are 53.6 μg L-1, 38.0 μg L-1, 5.8 μg L-1, 5.4 μg L-1, 4.2 μg L-1, <2.0 μg L-1. Polgolla dam site also recorded some trace metal contamination following the sequence, Al > Zn > Fe > Cu > Mn > Pb and volume weighted mean concentrations of above sequence are 51.5 μg L-1, 40.5 μg L-1, 4.8 μg L-1, 2.4 μg L-1, 1.5 μg L-1, <2.0 μg L-1. Despite less industrialization and less traffic congestion, Peradeniya University premises also showed some extent of atmospheric trace metal contamination following sequence of Al > Zn > Cu > Fe > Mn > Pb and volume weighted mean concentrations of above sequence are 46.1 μg L-1, 44.3 μg L-1, 2.6 μg L-1, 1.9 μg L-1, 1.7 μg L-1, <2.0 μg L-1. Principal component analysis (PCA), used to predict possible sources for the above trace metal contaminants, indicates that Mn, Cu and Zn are originated mainly from anthropogenic activities, such as fossil fuel combustion and burning municipal waste. Al and Fe are mainly originated from natural sources as those metals are the major components of alumino-silicate based earth crust.
Chemical characteristics of wet precipitation at Peradeniya in Sri Lanka
(Environ Monit Assess, 2020) Liyandeniya, A.B.; Deeyamulla, M.P.; Abeysundara, S.P.
The purpose of this research was to study chemical characteristics of precipitation in Peradeniya (Latitude 6.973701, Longitude 79.915256), Kandy District in Sri Lanka. This study was conducted during 2012 to 2014, and wet precipitation was analyzed for pH, conductivity, Na+, NH4+, K+, Mg2+, Ca2+, F−, Cl−, NO3−, SO42−, Pb, Cu, Mn, Al, Zn, and Fe for a total of 125 samples. Less than 2% events of acidic precipitation were recorded, and the VWA of the major ionic species present in precipitation samples were in the order of Ca2+ > Na+ > Cl− > NH4+ > SO42− > K+ > NO3− > Mg2+. Neutralization of acidity of precipitation is much more related to CaCO3 than NH3, and the presence of high content of Ca2+ strongly supports this fact. When considering marine contribution, SO42−/Na+, Ca2+/Na+, Mg2+/Na+, and K+/Na+ ratios are higher than the reference value suggesting that contribution of sources other than marine. Concentration of Zn is the highest while that of Mn is the lowest. Principal component analysis identified probable sources for major ionic and elemental sources as both natural and anthropogenic sources such as vehicular emission due to heavy traffic, waste incineration, bio mass burning, brass industry, and construction.
Chemical composition of rainwater at three sites in Kandy/Peradeniya, Sri Lanka, and its effect on air pollution
(2023) Madhushani, L.S.; Dharmapriya, T.N.; Dharaka, B.D.P.; Deeyamulla, M.P.; Priyantha, N.
The composition of atmospheric precipitation, an important criterion considered to account for air pollution, is usually determined with respect to wet precipitation and dry precipitation, or as bulk deposition in combined form. Although rainwater quality should be continuously monitored in order to understand the extent of air pollution, such investigation lacks attention in Sri Lanka. This study was thus aimed to determine the composition of bulk deposition collected weekly for a period of eleven months from February to December 2019, in three sampling locations; namely the University of Peradeniya (UOP), Kandy City Central (KCC) and Polgolla. Parameters quantitatively determined, rainfall, pH, conductivity, salinity, total dissolved solids (TDS), hardness, anions: Cl−, NO3−, SO42−, F−, PO43− and trace metals: Zn, Fe, Al, Mn, Cu, Pb, Cr, using standard analytical methods indicated that the KCC site showed the overall highest degree of air pollution followed by UOP and Polgolla sites. Nevertheless, no acid rain occurrences were observed during the sampling period in any of the three sites according to pH measurements. Anions of bulk deposition showed the sequence Cl−> SO42− > NO3−in all three sites with Cl−and SO42- being dominant anions. Furthermore, trace metals of bulk deposition showed the sequence, Zn > Fe > Al > Mn > Cu > Pb, in all three sites. Bulk precipitation data analyzed using Pearson correlation showed high positive significant correlations between conductivity and salinity, conductivity and TDS, and salinity and TDS, among all water quality parameters. Among trace metals, the highest positive significant correlation was found to be between Fe and Mn at the UOP Site. The highest positive significant correlation was between Al and Zn at the KCC site. No correlation between trace metals was found at the Polgolla Site.
Comparison of rainwater quality of three areas located in the vicinity of an oil refinery and thermal power plant in Sri Lanka
(Faculty of Science, University of Kelaniya, Sri Lanka, 2020) Hirushan, H.H.; Deeyamulla, M.P.
The chemical composition of rainwater, a form of wet deposition, differs over time due to a broad range of physical, chemical, and biological factors. The purpose of this analysis was to establish and compare the key ionic composition and water quality parameters of bulk deposition samples considering rainfall patterns, rainfall rates and pollutant sources. Three sampling sites were selected for the study in the Gampaha District in Sri Lanka which were separated by 7 km from each other. The first site was in the Makola South (MS) which represented an area in the vicinity of an oil refinery and thermal power plants; the second and third sites were in the University of Kelaniya (UOK) and Orugodawatta (OW) respectively, representing urban environments. Bulk depositions were collected after the container was almost filled avoiding any overflow. The chemical analyses of anions (F- , Cl- , NO3 - , SO4 2- ) in bulk depositions were carried out using the Dionex ICS-900 ion chromatography system and metals (V, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd, Pb) were analyzed using the ICP-MS 7800-Agilent system. The average pH in MS, UOK and OW sites was 6.70, 7.15 and 7.31 respectively, and it was almost neutral due to atmospheric neutralization. The average conductivity values of MS, UOK and OW sites were 40.96 µScm-1 , 35.63 µScm-1 and 38.93 µScm-1 , respectively. The average values of other water quality parameters (salinity, TDS) were higher in the MS site than the other sites. The dominant metals were Na, Cr, Fe, Cu, As, and SO4 2- was the dominant anion in the MS site than the other two sites showing the pollution may be due to the influence of oil refinery and the thermal power plants situated near the MS site. The results indicated that the metal concentrations, anion concentrations and the water quality parameters from the rainwater collected among the MS, UOK and OW sites, the MS site has higher concentrations and higher pollution due to its location being in the vicinity of the oil refinery and thermal power plant. According to the results obtained it can be stated that rainwater analysis can be used as an indirect method to determine ambient air quality.
Comparizon of atmospheric deposition of heavy metals in Kandy and Puttalam areas in Sri Lanka using moss (Hyophila involuta) as a bioindicator: short term study
(Sri Lanka Association for the Advancement of Science, 2013) Jayalath, K.G.; Deeyamulla, M.P.; de Silva, R.C.L.
Determination of current lead concentration in human blood by human biomonitoring in selected Sri Lankan population
(Faculty of Graduate Studies, University of Kelaniya, 2015) Amaranayaka, K.K.K.H.; Deeyamulla, M.P.; Gunasekara, K.A.D.C.
Lead contamination of human blood from occupational origin and vehicle emission is a cause for concern because of its potential accumulation ability in the environment and in living organisms leading to long term toxic effects. This study was aimed to assess the concentration of lead in blood of different groups exposed to different occupational conditions. Groups were selected based on the hypothesis that concentration of lead in blood may vary according to the type of exposure. Blood lead levels in students, drivers and workers of University of Kelaniya, motorcyclists and fuel station attendants in Kiribathgoda city area were studied. All other groups except fuel station attendants expose to vehicle smoke during their occupation and travelling. But fuel station attendants expose to vehicle smoke and gasoline vapors excessively during their duration of occupation than others. Some of the general population selected from a rural area who are least exposed to vehicle emissions and any occupational condition were used as the control group. A questionnaire was given to each volunteer that participated in the study to obtain the type and duration of exposure to check whether there is any correlation with lead level in blood to that parameters. Venous blood was obtained by a trained nurse and concentration of lead was determined by graphite furnace atomic absorption spectrophotometer after a microwave digestion. All analyzed groups except control group contained elevated level of lead in blood than the WHO recommended maximum level. Statistical analysis were carried out to identify the correlation between elevated level of lead in blood with the type of the exposure and the duration of the exposure. Statistical analysis revealed that lead level in blood is significantly different in each study group. Blood lead levels are found to be in, students (102.58 ± 18.50 μg L-1), drivers (208.50 ± 86.70 μg L-1) and workers (124.18 ± 27.05 μg L-1) of University of Kelaniya, motorcyclists (115.34 ± 15.30 μg L-1) and fuel station attendants (220.00 ± 65.90 μg L-1). It was also observed that individuals who smoke cigarettes had extremely high levels of lead in blood with respect to non-smokers within a same study group.
Heavy metal contamination in road dust from Colombo-Katunayake Expressway, E03
(Sri Lanka Association for the Advancement of Science, 2015) Priyadarshana, L.W.V.; Deeyamulla, M.P.; Priyantha, Namal
Identification of wild plants to phytoextract chromium from polluted terrestrial environments
(Sri Lanka Association for the Advancement of Science, 2013) Liyanage, A.L.L.A.; Jayalath, K.G.; de Silva, R.C.L.; Deeyamulla, M.P.
Investigation of the heavy metal accumulation mechanism in moss (Hyophila involuta) and the relationship between heavy metal content and photosynthetic efficiency
(Sri Lanka Association for the Advancement of Science, 2014) Senavirathna, J.A.P.P.; Deeyamulla, M.P.
Kinetic investigation of reactions of atomic carbon, C[2p2(3PJ)], with simple nitrogen-containing molecules and aromatic heterocyclic compounds
(Journal of Photochemistry and Photobiology, Chemistry A, 2007) Deeyamulla, M.P.; Husain, D.
The reactions of atomic carbon in its electronic ground state, C[2p2(3PJ)], with some simple nitrogen-containing molecules and aromatic heterocyclic compounds have been investigated by time-resolved atomic resonance absorption spectroscopy in the vacuum ultra-violet following the generation of C(23PJ) by the pulsed photolysis of C3O2. Decay profiles for atomic carbon were derived from resonance absorption measurements at ? = 166 nm (33PJ?23PJ) using repetitive pulsing techniques coupled with signal averaging. Absolute rate data for the collisional removal of C(23PJ) by these gases were obtained as follows: kR (cm3 molecule?1 s?1, 300 K): NH3 < 1.1 ? 10?1, 1-propanamine < 8.2 ? 10?12, 2-methylpyridine = 5.3 � 0.6 ? 10?10, 4-methylpyridine = 5.5 � 0.2 ? 10?10, 1-methylpyrrole = 2.3 � 0.5 ? 10?10, thiazole = 2.9 � 0.2 ? 10?10, oxazole = 2.4 � 0.2 ? 10?10 and isoxazole = 2.2 � 0.3 ? 10?10. The rate data were compared, where possible, with absolute rate data for analogous collision targets reported hitherto and considered within the context of the role of atomic carbon in the interstellar medium.
Kinetic studies of atomic carbon, C[2p2(3PJ)], with small sulfur-containing molecules by time-resolved atomic resonance absorption spectroscopy in the vacuum ultra-violet
(Journal of Photochemistry and Photobiology A: Chemistry, 2006) Deeyamulla, M.P.; Husain, D.
We present a kinetic investigation of the reaction of atomic carbon in its electronic ground, C[2p2(3PJ)], with the small sulfur-containing molecules H2S, OCS, SO2 and CS2 by time-resolved atomic spectroscopy in the vacuum ultra-violet following the generation of C(23PJ) by the pulsed photolysis of C3O2. Decay profiles for atomic carbon were derived from resonance absorption at ? = 166 nm (33PJ?23PJ) using repetitive pulsing techniques coupled with signal averaging. Absolute rate data for the collisional removal of C(23PJ) by these gases were obtained as follows: kR (cm3 molecule?1 s?1, 300 K)?H2S 2.5 � 0.6 ? 10?10, OCS 5.6 � 0.2 ? 10?11, SO2 9.7 � 0.3 ? 10?11 and CS2 1.6 � 0.4 ? 10?10. Rate data for the reaction of atomic carbon with the photochemical precursor, necessary as an absolute kinetic standard, were obtained yielding k(C3O2) = 1.8 � 0.3 ? 10?10, in full agreement with previous investigations. The rate data in general were compared, where possible, with those derived from fast flow techniques and molecular beams for the particular case of H2S where overall insertion has been demonstrated with the detection of HCS and where H atom abstraction would be endothermic. The results in general are considered within the context of C atom reactions with sulfur-containing species in the interstellar medium.
Kinetic Studies of Atomic Carbon, C[2p2(3PJ0), with Thiols by Time-resolved Atomic Resonance Absorption Spectroscopy in the Vacuum Ultra-Violet
(Progress in Reaction Kinetics and Mechanism, 2005) Deeyamulla, M.P.; Husain, D.
Reaction rates of atomic carbon in its electronic ground state, C[2p2(3PJ)], with a range of large sulfur-containing molecules have been investigated using time-resolved atomic spectroscopy in the vacuum ultraviolet following pulsed irradiation. Absolute rate data for the collisional removal at 300?K of C(23PJ) by the gases 1-propanethiol, 1-butanethiol, 1-pentanethiol, 2-propanethiol, 2-methyl-1-propanethiol, 2-methyl-2-propanethiol and dimethyl sulfide are reported. All processes proceed at rates of the order of the collision numbers, supporting an overall mechanism of C-atom insertion into the S?H bond following initial addition, which is energetically favourable, a mechanism demonstrated analogously hitherto with H2S and where H-atom abstraction would also be endothermic
Monitoring of Rainwater Quality in Kandy and Peradeniya, Sri Lanka
(2023) Wijewantha, H.L.S.S.; Dharaka, B.D.P.; Priyantha, N.; Deeyamulla, M.P.
The composition of atmospheric deposition is a measure of air quality, an important aspect of the health of the ecosystem. Consequently, continuous monitoring of atmospheric deposition is crucial to obtain remedial measures to avoid undesirable aspects that would affect living things. In this context, the objective of this study was to determine the rainwater quality at selected locations in Kandy and Peradeniya area of Sri Lanka, namely, Kandy city, Polgolla and University of Peradeniya (UOP), and to identify possible correlations between quality parameters through statistical means. Forty (40) rainwater samples from the UOP site and seven (07) samples each from the Kandy city and Polgolla sites were collected from the 18th May 2020 to 28th April 2021. The volume weighted average (VWA) pH values of UOP, Kandy and Polgolla sites were determined to be 7.44, 7.19 and 7.19, respectively, and moreover, acid rain (pH < 5.6) occurrences were not detected during the sampling period. The VWA values of rainfall, conductivity, salinity, TDS and hardness at the UOP site were 40.12 mm, 51.93 µS cm− 1, 0.0300 ppt, 26.59 mg L− 1 and 13.55 mg L− 1, respectively. The corresponding values of the Kandy city site were 16.52 mm, 64.04 µS cm− 1, 0.0361 ppt, 30.80 mg L− 1 and 19.49 mg L− 1, respectively; and those of the Polgolla site were 33.10 mm, 53.90 µS cm− 1, 0.0310 ppt, 25.76 mg L− 1 and 19.31 mg L− 1, respectively. The VWA values of conductivity, salinity, TDS were the highest at the Kandy city site. Further, the VWA values of hardness at Kandy and Polgolla were approximately equal, probably due to spring of Ca2+ and Mg2+ particulates from the dolomite quarry located in Digana area. The most prominent anion was identified as Cl− in bulk deposition at all three sites, while NO3− showed the lowest concentration of all sites. Moreover, very strong significant positive correlations were identified between conductivity-TDS, conductivity-salinity, conductivity-hardness, TDS-hardness, TDS-salinity, salinity-hardness, SO42− - Cl−, and NO3− - Cl− according to relevant Pearson correlation coefficients. It is thus concluded that the pollutants come from the same sources, either natural or anthropogenic.
Moss (Barbula sp.) as a bioindicator to monitor heavy metal air pollution: Comparison of native moss and moss bag technique
(Sri Lanka Association for the Advancement of Science, 2008) Jayalath, J.I.K.G.; Deeyamulla, M.P.
Biomonitoring techniques using moss (Barbula sp.) as a bioindicator have been used to examine heavy metal deposition in local areas and around point sources. We sought to determine the efficacy of moss bag technique and native moss method against bulk deposition to determine heavy metal air pollution. Atmospheric heavy metal deposition was determined around the industrial area of Sapugaskanda which includes an oil refinery, an industrial zone and three power plants; Sedawatte which has the influence of Kalanitissa power plant and Dalugama University premises which close to the A1 road. Heavy metals (Pb, Ni, Cu, Cd and Cr) were determined by Atomic Absorption Spectroscopy (AAS) during six months of period from October 2007 to March 2008. Heavy metal concentrations measured in three sampling sites during six months of period is given in μg/g dry weight of moss sample in native moss and moss bag technique. Concentration of heavy metals in bulk collector is expressed in μg/cm2 area of the funnel. Dry weight of moss in unit area was used to bring these results into a common unit. A hypothesis was developed according to the equality of population variance of results in two methods and the corresponding significant levels (α value-probability of making a decision to reject the null hypothesis when the null hypothesis is actually true) were obtained from the F distribution table to compare native moss method and moss bag technique with bulk deposition method. The results indicate that the moss bag technique is most suitable to monitor heavy metal air pollution than the native moss method when compared with the bulk deposition method.