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Title: Relationship between ambient sulphate and sulphur dioxide at four different sites in Agra
Authors: Parmar, R S
Lakhani, Anita
Kulshrestha, U C
Kumar, N
Kumari, K M
Prakash, Satya
Srivastava, S S
Issue Date: Apr-1999
Publisher: NISCAIR-CSIR, India
Abstract: Concentrations of sulphur dioxide, particulate sulphate, and several trace metals (Fe, Mn, Cr, Zn, Ni, Cd and Pb) were determined in samples collected from (our different sites, namely, Dayalbagh, Hari Parvat, Taj Ganj and Udyog Kendra (abbreviated as DB, HP, TG and UK , respectively) in Agra. The four sites were representative of agricultural, residential/commercial and industrial areas. Regression and correlation analyses were performed to derive relationships between atmospheric SO4 and SO2 following the method described by Fugas and Gentilizza [Atoos Environ (UK), 12 (1978)335]. Concentrations of SO2 ranged between 6.3 and 20.4, while SO4 concentrations varied between 23.3 and 64.8 μg m-3 , Linear equations between SO4-S and total S showed intersite differences in the slope values. Values of slope indicate differences in rate of formation of SO4 . The values were found to be 0.01 and 0.03 at TG and HP and 0.10 and 0.16 at DB and UK, respectively. However, the power law of the form y = axb was established as the best representation of linear relationship between SO2 and SO4. Site specific characteristic values for the regression coefficients were obtained. The regression coefficients indicate that at DB and UK there is not much difference in the percentage of SO4 formed at high and low concentrations of total S as compared to that at HP and TG. This reflects that the oxidation of SO2 to SO4 is enhanced by alkaline dust particles, the metal ions playing a catalytic role.
Page(s): 60-65
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.28(2) [April 1999]

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