title: Spatial and temporal variation of heavy metals in atmospheric aerosol of Delhi.
abstract: The levels of Suspended Particulate Matter (SPM) and heavy metals viz. Pb, Cd, Cr, Ni and Fe were measured. Aerosol samples from four different locations in Delhi were collected by High-volume samplers for a period of one year from July 1997 June 1998. Metal concentration was determined by Atomic Absorption Spectrometry. The annual average concentration of SPM in Delhi was found to be 416.34 +/- 223 microg m(-3). The atmospheric aerosol samples were highly enriched with elements viz. Pb and Cd, which originate from various human activities like transportation and industrial processes. Principal Component Analysis (PCA) showed vehicular traffic and industrial emission as the major contributors of metals. The annual average concentration of Pb did not exceed the national standard of 0.75 microg m(-3).
authors.affiliation: Air Pollution Monitoring Laboratory, School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, India. psk@mail.jnu.ac.in
authors.forename: P S
authors.initials: PS
authors.lastname: Khillare
authors.forename: S
authors.initials: S
authors.lastname: Balachandran
authors.forename: Bharat Raj
authors.initials: BR
authors.lastname: Meena
mesh_terms: D000336:Aerosols / Q000737:chemistry; D000393:Air Pollutants / Q000032:analysis*; D002104:Cadmium / Q000032:analysis; D004784:Environmental Monitoring; D006801:Humans; D007194:India; D007220:Industrial Waste; D007854:Lead / Q000032:analysis; D019216:Metals, Heavy / Q000032:analysis*; D025341:Principal Component Analysis; D013054:Spectrophotometry, Atomic; D013997:Time Factors
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D007220:Industrial Waste; D019216:Metals, Heavy; D002104:Cadmium; D007854:Lead