NUTRIENTS STATUS IN LAKE NASSlin AND H1VER NILE AT ASWAN, EGYPT.

NUTRIENTS STATUS IN LAKE NASSlin AND H1VER NILE
AT ASWAN, EGYPT.
A.A. ELEWA *,5.1\1. SA YY A11**, A.F.A. LATIF*, AND M.P. TOUFFEIU.
National Institute of Oceanography and Fisheries. Cairo, Egypt.

Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City,

Ca ira/Egypt.

ABSTRACT
The vertical and regional variations
of nutrient salts (nitrite, nitrate, phosphate
and silicate) were studied during the period
of February 1987 to October 1987. The
vertical distribution of these nutrient
salts along the di Fferent regions shows
remarkably irregular trend. In Lake Nasser.
the average nitrite content fl uctllated between
a minimum value of 1.8 ~gl-1 measured at
3 km ups tream of Hi gh Dam duri ng Februa ry
and a maximum of 120 ~gl-1 measured at 10
km from the Hi gh Dam in JUI y. In Aswan
Reservoir and Nile water, the ranges of
nitrite content were 8.33 – 100 and 23.33
671.67 ~gl-1 respectively. Also. the
average nitrate concentration varied between
159 – 378, 138 – 447 and 540 – 5167 ~gl1 calculated for Lake Nasser, Aswan Reservoir
and Nile water respectively. The higher
concentration of nitrite and nitrate salts
in the Nile water with respect to other
regions is mainly attributed to sewage,
industrial wastes and human activities.