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Title: Influence of calcium and sulphate on the pH of rainwater at Delhi
Authors: Tiwari, Suresh
Singh, J V
Momin, G A
Rao, P S P
Safai, P D
Ali, K
Issue Date: Dec-2001
Publisher: NISCAIR-CSIR, India
Abstract: Rainwater samples were collected at three different locations during two consecutive summer monsoons of 1990 and 1991 at Delhi. These locations were Okhla, Red Fort and Rajinder Nagar which represent industrial, commercial and residential locations, respectively. The major anions (Cl, SO4, and NO3) and cations (Na, K, Ca, Mg and NH4) along with pH of the above samples were determined. The bicarbonate (HCO3) concentrations were also calculated. High levels of Ca and SO4 were observed. Together, Ca and SO4 made up more than 50% of the total ion mass, while Ca alone contributed over 55% of the total cations mass. The pH value of rainwater was found to be alkaline in nature with an average of 6.13 and the values varied from 5.01 to 7.12. The relative importance of natural and anthropogenic sources was estimated by chemical balancing. In some cases, acidity was found due to the presence of sulphuric and nitric acid. High concentration of soil-oriented elements especially Ca has been found to play an important role in neutralizing the acidity of rainwater and maintaining high alkaline pH. Most of the SO4 in rainwater was in the form of CaSO4. The results of the present study suggested that the atmospheric composition in the city has been strongly influenced by natural sources (sea and soil) rather than anthropogenic sources.
Page(s): 325-331
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.30(6) [December 2001]

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