الفهرس 
Acknowledgement
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Abstract
Abstract
A study was carried out using Gaussian plume model to theoretically
trace the dispersion of sulphur dioxide (SO2) emitted from El-walidea
thermal power plant in Assiut city at different meteorological conditions and
to determine SO2 effects on the soils and plants around this power plant.
Actual SO2 concentrations were estimated at five different sites in Assiut city
(Nazlet Abdellah, El-Magzob square, Old Assiut University Campus, Assiut
University hospital and Al-Eman hospital) to ensure the accuracy of the
Gaussian plume model using a mobile monitoring unit.
The results showed that the actual SO2 concentrations in the studied
sites ranged from 2.45 ppb at Al-Eman hospital to 25.6 ppb at Nazlet
Abdellah. Mainwhile, the predicted SO2 concentrations using the Gaussian
plume model varied from 2.3 ppb at Al-Eman hospital to 26.3 ppb at Nazlet
Abdellah. However, these actual and predicted SO2 values are considered
below the allowable limit (57 ppb) given by the Egyptian standards (EEAA,
1994) The concentration of SO2 in the studied sites decreased in the order of
Nazlet Abdellah > El-Magzob square > Old Assiut University Campus >
Assiut University hospital > Al-Eman hospital. Small differences between
the model results and the measured ones may be related to the assumption of
this model.
Sulphur dioxide effects on the soils and plants at six sites around the
power plant were estimated through the determination of the extractable soil
sulphate and the total sulphur in Buckthorn leaves. These sites were chosen
around the power plant so that they might be exposed to different
concentration of emitted SO2.The results also showed that the southeastern
site (#3) had the highest extractable soil sulphate level (580 mg/kg) and the
highest total sulphur in the washed (160 mg/kg) and non-washed (2840
mg/kg) Buckthorn leaves. The control site that is located in the northern
direction of the power plant had the lowest extractable soil sulphate (200
mg/kg) and the lowest total sulphur in the washed (20 mg/kg) and nonwashed
(22 mg/kg) Buckthorn leaves. Predicted data of SO2 at six sites using
Gaussian model showed the same trend for the actual determinations of
extractable soil sulphate and the total sulphur in the leaves at these sites.
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It is concluded that gaussian plume model showed well-matched
results of Sulphur dioxide pollution with the actual results of SO2
estimations, as well as soil sulphate and plant sulphur content determinations.