Aluminum enters the aquatic environment through its use in the manufacture of utensils, electrical goods, cement, and as a byproduct of aluminum ore processing and thermal power plants.Unlike other metals, it exists in different ionic forms at different pH i.e. as Al(H20)63+ at pH < 5.0, as Al(OH)2+ and Al(OH)2+ above pH 5.0 and as Al(OH)3 precipitates in neutral solution, which redissolves in basic solution due to the formation of the tetracoordinated Al(OH)4-complex (15).Nalewajko and Paul (16) demonstrated that the addition of Al (250,ug l-') significantly decreased microbial phosphate uptake in water samples from two Canadian lakes.Pettersson et al. (19) further demonstrated that aluminum exerts a toxic effect by causing phosphate starvation in Anabaena cylindrica.Husaini and Rai (8) observed a pH-altered reduction in uptake and assimilation of nitrate and
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Husaini et al. (1996) studied this question.