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Monsoon rain chemistry and source apportionment using receptor modeling in and around National Capital Region (NCR) of Delhi, India

Tiwari, S and Kulshrestha, UC and Padmanabhamurty, B (2007) Monsoon rain chemistry and source apportionment using receptor modeling in and around National Capital Region (NCR) of Delhi, India. Atmospheric Environment, 41 (27). pp. 5595-5604.

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Studies on monsoon precipitation chemistry were carried out to understand the nature of rainwater and sources of pollution at eight different locations in and around the National Capital Region (NCR) of Delhi during southwest monsoon in the years 2003-2005. These sites were Bulandshahr (BUL), Garhmuktesar (GAR), Muradnagar (MUR), Sardhana (SAR), Panipat (PAN), Charkhi Dadri (CHA), Hodal (HOD) and Bahror (BAH). The rainwater samples, collected at these locations, were analyzed for major anions, cations and pH. The data were assessed for its quality. In general, the order of concentrations of major ions was observed to be: Ca 2+>SO 4 2->HCO 3 ->NH 4 +>Cl ->NO 3 ->Na +>Mg 2+>K +> F -. The average pH of rainwater at these stations was observed to be 6.39, ranging from 5.77 to 6.62, indicating alkaline nature. However, a few rain events, 31 at Panipat, 12 at Muradnagar and 29 at Sardhana, were observed to be acidic (pH<5.6). Acidity observed at Panipat and Muradnagar is attributed to industrial influence but at Sardhana to weak organic acids contributed by surrounding vegetation. No definite trends are found for most of the components at all the sites. However, concentrations of Cl - at Bulandshahr; NO 3 - at Muradnagar and Hodal; F - at Panipat and Bahror; Na + at Bulandshahr; K + at Bahror and Bulandshahr; Ca 2+ at Bulandshahr, Muradnagar, Charkhi Dadri and Sardhana; Mg 2+ at Panipat, Bahror, Bulandshahr, Hodal and Sardhana have increased from 2003 to 2005. For source identification, principal component analysis (PCA) was made, which showed that in general, at all the sites; suspended soil-dust and sea salts which are natural sources, were identified as the most dominating. Sources like agriculture including cattle, brick kilns and industries were reflected in third or fourth PC indicating moderate influence of anthropogenic activities in this region.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: Ion sources; pH effects; Precipitation (meteorology); Principal component analysis; Water, Alkaline pH; Monsoon rain; Precipitation chemistry; Receptor modeling; Soil-dust interference, Atmospheric chemistry, carboxylic acid; rain, acidity; atmospheric chemistry; atmospheric modeling; data quality; human activity; industrial emission; ion; monsoon; pH; pollutant source; precipitation assessment; principal component analysis; rainwater, air pollution; article; India; industrial area; pollutant; precipitation; priority journal; seasonal rain forest; soil pollution; water pollution, Asia; Delhi; Eurasia; India; South Asia, Bos
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 22 Feb 2015 22:47
Last Modified: 22 Feb 2015 22:47

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