Atmospheric precipitation in Sri Lanka occurs mainly through rain whose terrestrial composition significantly varies based on the location as the regional geography and anthropogenic factors can largely affect environmental pollutants that are added to the atmosphere. It is therefore very important to have baseline data on the chemical composition of the atmosphere to take regulatory measures to control atmospheric pollution although very limited data available in Sri Lanka. The main objective of this study was thus to quantitatively determine selected trace metals (Al, Cr, Cu, Fe, Mn, Pb, and Zn) in bulk precipitation samples collected weekly in three sampling locations, namely the University of Peradeniya (UoP), Polgolla, and Kandy City Central (KCC), for a period of 1 year from March 2018 to March 2019. Trace metals determined using atomic emission spectrophotometry indicated that the KCC site showed the highest contamination following the sequence (with respective volume-weighted mean (VWM) concentration values) of Al (79.7 μg L⁻¹) > Fe (42.8 μg L⁻¹) > Zn (39.3 μg L⁻¹) > Mn (13.9 μg L⁻¹) > Cu (9.8 μg L⁻¹) > Cr (2.4 μg L⁻¹). The corresponding values of the Polgolla site showed the sequence Zn (64.3 μg L⁻¹) > Al (52.1 μg L⁻¹) > Fe (17.9 μg L⁻¹) > Mn (11.1 μg L⁻¹) > Cu (5.4 μg L⁻¹) > Cr (1.8 μg L⁻¹). Due to less industrialization and less traffic congestion, the UoP site showed low trace metal levels in the order Zn (29.8 μg L⁻¹) > Al (21.3 μg L⁻¹) > Fe (14.2 μg L⁻¹) > Cu (7.4 μg L⁻¹) > Mn (4.3 μg L⁻¹) > Cr (0.9 μg L⁻¹). Principal component analysis indicated that Cu, Mn, and Zn originated mainly from anthropogenic activities, such as combustion of fossil fuel and burning of municipal waste, while Al and Fe mainly originated from natural sources.

斯里兰卡的大气降水主要是通过降雨产生的，因为该地区的地理和人为因素可以极大影响添加到大气中的环境污染物，所以其地面组成根据地理位置而有很大不同。因此，拥有关于大气化学成分的基线数据以采取管制措施来控制大气污染非常重要，尽管斯里兰卡的数据非常有限。因此，这项研究的主要目的是定量确定每周在三个采样地点即佩拉德尼亚大学（UoP），大洋洲，大洋洲，南美洲和北美洲所采集的大量降水样品中的选定微量金属（Al，Cr，Cu，Fe，Mn，Pb和Zn）。从2018年3月至2019年3月，为期1年的波哥拉和康提市中心（KCC）。^-1）> Fe（42.8μgL ^-1）> Zn（39.3μgL ^-1）> Mn（13.9μgL ^-1）> Cu（9.8μgL ^-1）> Cr（2.4μgL ^-1）。Polgolla位点的相应值显示顺序为Zn（64.3μgL ^-1）> Al（52.1μgL ^-1）> Fe（17.9μgL ^-1）> Mn（11.1μgL ^-1）> Cu（5.4μg L ^-1）> Cr（1.8μgL ^-1）。由于较少的工业化和较少的交通拥堵，UoP站点显示的痕量金属水平较低，依次为Zn（29.8μgL ^-1）> Al（21.3μgL ^-1）> Fe（14.2μgL ^-1）> Cu（7.4）微克升^-1）> Mn（4.3μgL ^-1）> Cr（0.9μgL ^-1）。主成分分析表明，Cu，Mn和Zn主要来自人为活动，例如化石燃料燃烧和城市垃圾燃烧，而Al和Fe主要来自自然资源。