DARU Journal of Pharmaceutical Sciences 1990. 1(2):69-79.

Tehran Groundwater Chemical Pollution
M- Shariatpanahi

Abstract


Seventy eight wells water sample of Tehran plain were examined to determine r its groundwaters chemical pollution. Tehran s groundwaters are slightly acidic and their total dissolved solids are high and are in the hard water category.
The nitrate concentration of wells water of west region is less than per¬missible level of W.H.O. standard, whereas, the nitrate concentration of some of the other regions wells exceed W.H.O. standard which is indication of pollution
with municipal wastewaters. The concentration of toxic elements Cr, Cd, As, Hg and
i Pb of some of the west, east and south regions wells of Tehran is more than per¬missible level of W.H.O. standard, whereas, the concentration of Cu, Zn,Mn and detergents is below W.H.O. standard.
1
In general, the amount of dissolved materials of Tehran s groundwaters and also
i the potential of their contamination with nitrate is increased as Tehran s ground-
waters move further to the south, and even though, Tehran s groundwaters contamination with toxic elements is limited to the industrial west district, industrial-residential east and south districts, but»with regard to the disposal methods of
t municipal and industrial wastewaters, if Tehran s groundwaters pollution continues,
local contamination of groundwaters is likely to spread. So that finally their quality changes in such a way that this water source may become unfit for most domestic, industrial and agricultural uses. This survey shows the necessity of collection and treatment of Tehran s wastewaters and Prevention of the disposal of untreated wastewaters into the environment.

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