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Title: Experimental study on deposition of oxides of sulphur and nitrogen on dry and wet surrogate surfaces
Authors: Parmar, R S
Satsangi, G S
Lakhani, Anita
Srivastava, S S
Prakash, Satya
Issue Date: Jun-2000
Publisher: NISCAIR-CSIR, India
Abstract: Dry deposition of oxides of S and N, which contributes significantly (30-50 %) to the total deposition of SO4-2 and NO3- in temperate countries has been determined over surrogate surfaces. Wet and dry surrogate surfaces were exposed to collect SO2, NOx, SO4-2 and NO3-. The trace gases SO2, NOx, HNO3 and particulate SO4-2 and NO3- were measured simultaneously to determine deposition velocities. Deposition fluxes (μg m-2 d-1) of SO2, NOx, SO4-2, NO3- were found to be 250.6 ± 13.0, 319.7 ± 27.6, 8640 ± 36.2 and 6048 ± 51.8 on the wet surfaces and 44.9 ± 12.9, 12.0 ± 4.8, 777.6 ± 35.4 and 864 ± 45.7 on the dry surfaces, respectively. The mean vapour phase concentrations (μg m-3) of SO2, NOx, HNO3 and particulate SO4-2 and NO3- were 8.7, 24.4, 2.7, 14.6 and 3.0, respectively. From these measured values, deposition velocities of SO2, NOx, SO4-2 and NO3- were calculated for the wet and dry surfaces. The velocities were found to be higher on the wet surfaces. An attempt has also been made to differentiate between the contributions of different phases to the total dry deposition of SO4-2 and NO3-.
Page(s): 134-139
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.29(3) [June 2000]

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